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Waste valorisation as secondary or alternative raw materials in several sectors products and processes has been an important way to implement a more sustainable and circular way to manage the efficient use of natural resources. This action contributes not only to save natural resources but also to prevent sending large amounts of wastes, some of them dangerous, to landfill disposal, creating a major environmental, economic and social impact. To promote circular economy, this work attempts to demonstrate the environmental gains in a competitive way, by bringing together in an industrial symbiosis action, two large producing sectors (the pulp and paper industry and concrete construction sector), which are also able to consume significant amounts of resources and to generate large amounts of wastes. A sustainability evaluation based on a life cycle and circular approach is presented and discussed using a simple case study performed at real industrial scale. The lime ash waste from the pulp and paper industry is used to replace 100% of the natural filler used in precast concrete production and the impacts and benefits from the technical, environmental, economic and social level were assessed. It was demonstrated that this simple action causes positive impacts in the evaluated dimensions of sustainability without causing any changes in production time and causes no degradation on relevant concrete properties. [ABSTRACT FROM AUTHOR]

Industrial enterprises around the world are grappling with greenhouse gas emission reduction expectations, whether being driven by respective government policy for climate change or by shareholders to drive corporate sustainability through maintaining access to their 'net zero'-demanding markets. In some instances, the enterprises co-located within complex industrial areas are coming together to face the common carbon reduction challenge as a collective. The Kwinana Industrial Area in Perth, Western Australia is well regarded on the world's stage as a successful integrated heavy industrial precinct, presenting as an extensive, complex, and broad-based example of Industrial Symbiosis. In earlier papers, the authors have posited a novel four-dimensional framework to expand the definition of Industrial Symbiosis to be used to understand why one industrial precinct may be more successful for its resident industries to operate within than another, and for application in the design of new industrial areas. The four dimensions are described as Materials Exchange, Skilled Workforce, Support Industry, and Governance. Through the lens of climate change literature and policy frameworks, we investigate the governance dimension and industry's response to the contemporary climate challenge. The outputs of the paper include a literature review of the governance dimension, and a description of the cascading nature of climate change policy from global through to the enterprise level. We illustrate how climate change governance is enhanced in practice by detailing how the enterprises in Kwinana collectively responded to the global requirement for carbon reduction, achieved through the facilitative governance-based intervention of their industry association, the Kwinana Industries Council. Exploring this in-practice example helped to consolidate the hypothesis that successful industrial symbiosis is about positive relationships across several dimensions building towards improved Circular Economy outcomes. [ABSTRACT FROM AUTHOR]

BACKGROUND AND OBJECTIVES: The coffee agroindustry in Indonesia plays a significant economic role as the third largest coffee producer worldwide. Despite the high economic contribution, the coffee agroindustry also raises environmental issues along its supply chain. Coffee solid waste constitutes biomass containing useful compounds promising as raw materials for added-value products through the implementation of industrial symbiosis. Eco-industrial parks create value through industrial symbiosis, emphasizing the principle of a closed-loop production system, simultaneously decreasing the use of raw materials and waste. This study aimed to analyze and develop a coffee-based eco-industrial park design via a systems engineering approach and optimization of industrial symbiosis in closed-loop coffee production. METHODS: This study employed a case study in the Ketakasi coffee-producing center in Jember, Indonesia. Data collection was conducted through field observation and a series of in-depth interviews. The development of eco-industrial park design followed a systems engineering methodology, as demonstrated through the utilization of Business Process Model and Notation. Subsequently, the optimization of industrial symbiosis within eco-industrial parks was realized using a mixed-integer linear programming mathematical model. FINDINGS: The eco-industrial park design presents the actors, internal business processes, material and data exchanges, various actors' interdependence and critical roles in material exchanges, and value creation processes using valorization within the eco-industrial park. The role of the Ketakasi cooperative as a facilitator of material exchange and manager of the eco-industrial park is pivotal. The utilization of data integration enhances the transparency and efficiency of information exchange among eco-industrial park participants, promoting predictability and reliability in material exchange. The application of the mixed-integer linear programming optimization model has provided a structured approach to maximizing the value creation within the eco-industrial park through the valorization of 72.3 percent of coffee pulp and 68.5 percent of spent coffee grounds into cellulase enzymes and ultraviolet shields. CONCLUSION: This paper presents a structured framework for efficiently managing material exchange processes within an eco-industrial park, contributing to environmental sustainability and economic value creation. This study contributes to the knowledge gap in the literature by developing an inclusive eco-industrial park design that facilitates the optimization of the value creation process through valorization technology. This study also adds to sustainable agriculture management literature through a coffee-based eco-industrial park design. [ABSTRACT FROM AUTHOR]

Industrial symbiosis (IS) can contribute to achieving a win-win situation between industry and environment for local and regional circular economies. Many authors have recognized that a variety of barriers can hinder the implementation of IS. However, there is very limited research on quantitatively evaluating the IS barriers. In this paper, we propose a model which combines the Analytic Hierarchy Process (AHP) and the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) to evaluate the IS barriers semi-quantitatively. This model assists in identifying and prioritizing the fundamental barriers for implementation of IS in a comprehensive manner. An operating IS, the Hai Hua Group (HHG), in Shandong Province, China is used as a case study to test the proposed model. The results show that the top four generic barriers are technological barriers, economic barriers, safety barriers, and informational barriers. More specifically, the barriers are information platforms, human safety and health, technology involved with extending industrial chains, product added value, and costs. The paper concludes by discussing managerial implications for promoting the establishment and operation of IS. [ABSTRACT FROM AUTHOR]

Industrial Symbiosis (IS) involves a network of organizations that exchange energy, materials, and by-products to lower production costs, reduce environmental impact, and conserve natural resources. Despite over two decades of extensive research into IS, its benefits are well known, but implementation remains challenging. This paper proposes utilizing blockchain technology (BCT) to digitize IS, making it more secure and transparent. First, drivers and barriers of BCT implementation in IS are identified. A smart contract architecture framework using Hyperledger Fabric is then proposed using the constructed theoretical background and abductive method. Finally, the paper discusses how this framework supports the implementation of BCT in IS by addressing its drivers and attempting to overcome its barriers. It is a resource for those seeking a comprehensive grasp of the foundational elements necessary for constructing a successful IS blockchain design, which is adaptable to all types of IS network configurations. [ABSTRACT FROM AUTHOR]

Material flow analysis (MFA) is the main methodology to assess material flow circularity. It is essentially a data-analysis-based approach whose physical foundations consist of conservation of mass. To improve both the accuracy and the repeatability of MFA models, in this paper we leverage compartmental dynamical thermodynamics merged with graph theory and control theory. The key idea is that the thermodynamic compartments and their connections can be added, removed or modified as needed to achieve a circular material flow. Thus, our methodology consists of designing thermodynamical material networks (TMNs). We also provide a physics-based definition of circularity and implement a nonlinear compartmental control, which has been possible since TMNs are highly dynamic models based on differential calculus (i.e. ordinary differential equations) rather than on arithmetic as is typical for MFA models. As we envision scalable and repeatable designs of TMNs, we made publicly available the paper source code.1 [ABSTRACT FROM AUTHOR]

With an extensive presence in the world of Industrial Symbiosis literature, the Kwinana industrial area in Perth, Western Australia is a powerhouse of integrated heavy industrial activity. From when its first entrant arrived in 1955, development has been strong, and now it presents a complex industrial cluster with a wide range of industrial enterprises present, ranging from several major industrial multi-product manufacturers to those filling niche markets. Formal reporting of its economic contribution has occurred periodically over 40 yr, with one of the features of this being a series of four earlier iterations, and in this paper, the fifth, of a schematic diagram that identifies the enterprises engaged in symbiotic relationships and the nature of the associated materials exchanged. While the earlier reports concentrated solely on the traditional materials exchanges, the present study (data collected in 2021) went beyond these to gather additional data on what the authors are proposing as additional dimensions of the traditional Industrial Symbiosis framework. Aspects of Kwinana's skilled workforce, its support industry base, and its overlying governance framework were studied to provide insights into what role they play in explaining why some industrial clusters appear to provide a supportive business environment, and why other clusters struggle to gain momentum. The new study identified that the novel posited dimensions of Industrial Symbiosis are interlinked at the precinct level, and that at the macro (societal) level, they combine to contribute to the effectiveness of the Circular Economy. [ABSTRACT FROM AUTHOR]

Nowadays, industrial symbiosis (IS) is recognized as a key strategy to support the transition toward the circular economy. IS deals with the (re)use of wastes produced by a production process as a substitute for traditional production inputs of other traditionally disengaged processes. In this context, this paper provides a systematic literature review on the energy-based IS approach, i.e., IS synergies aimed at reducing the amount of energy requirement from outside industrial systems or the amount of traditional fuels used in energy production. This approach is claimed as effective aimed at reducing the use of traditional fuels in energy production, thus promoting a circular energy transition. 682 papers published between 1997 and 2018 have been collected, and energy-based IS cases have been identified among 96 of these. As a result of the literature review, three categories of symbiotic synergies have been identified: (1) energy cascade; (2) fuel replacement; and (3) bioenergy production. Through the review, different strategies to implement energy-based IS synergies are highlighted and discussed for each of the above-mentioned categories. Furthermore, drivers, barriers, and enablers of business development in energy-based IS are discussed from the technical, economic, regulatory, and institutional perspective. Accordingly, future research directions are recommended. [ABSTRACT FROM AUTHOR]

This paper investigates the negotiation phase of industrial symbiosis relationships, where companies exchanging wastes for inputs need to develop strategies on how to share the additional costs to operate the industrial symbiosis business. The business behavior is approached as a "coopetition" problem where companies need to cooperate to reduce waste discharge costs and traditional input purchase costs and dive into competition to pay a minimum share of additional costs (i.e., waste treatment, waste transportation, and transaction costs) of operating industrial symbiosis. A noncooperative game‐theoretical model for sharing the additional costs is proposed that highlights the two strategies that companies can adopt aimed at sharing costs: a fair strategy and an opportunistic strategy. Then, an agent‐based model is used to simulate the game iterated over time and investigate how the players can adapt their strategies according to their past experience. Simulation results show that players learn that playing the fair strategy is beneficial in the long period, despite in the short period they can gain more benefit by playing the opportunistic strategy. Findings of the paper are critically important to reduce the business and managerial barriers against the formation of industrial symbiosis networks and to stimulate innovative thinking of company managers to foster the development of the circular economy. The paper proposes theoretical, managerial, and policy implications, which are discussed in detail in a comparative manner between linear and circular economy. [ABSTRACT FROM AUTHOR]

The Circular Economy (CE) indices have become a valuable tool for supporting the development of policies that provide information that reduces environmental pressures and impacts. However, highly dimensional data identifying many CE indicators is impractical in application. This paper aims to create a composite index of the CE indicators using the Hierarchical Clustering on Principal Components (HCPC) to extract the meaning of the CE indicators, as reducing dimensionality can improve understanding of indicators and metrics. The advantage of the HCPC methodology over principal components analysis (PCA) alone involves applying objective clustering techniques to the PCA results, which results in a better cluster solution. This study analysed a dataset of 61 indicators obtained from De Pascale, Arbolino, Szopik-Depczyńska, Limosani, and Ioppolo (2021). The composite indices revealed the dimensions of industrial symbiosis (IS), CE strategies, and spatial applications of the CE and IS concepts. The bottom-up and top-down approaches for CE and IS strategies have been the main implementation approaches in different governments and regions. [ABSTRACT FROM AUTHOR]

Purpose: The circular economy is a key issue for any company, city, or institution. The linear economy model, based on "take, make, use and waste" of products and resources, has discarded potentially valuable resources and caused serious contamination problems. In contrast, the circular economy (CE) model is a strategic paradigm whose purpose is to regenerate and conserve resources through closed material loops and the sustainable use of energy in its processes. Therefore, a growing number of companies are applying different tools and techniques to implement the CE principles to innovate their products, services, and processes, achieving promising results. Thus, the main objective of this study is to suggest an implementation model named "Circular clock" based on a set of tools and techniques which firms may use for implementing CE. Design/methodology/approach: The paper presents an empirical analysis based on the triangulation method that includes three different data sources: semi-structured interviews in Spain, academic literature and books, and non-academic publications from institutions and consultancy firms. Findings: The most relevant result of this study is the proposal of a Circular Clock model for circular economy implementation is based on six fields of action define in the academic literature: take, make, distribute, use, recover, and industrial symbiosis. Moreover, this study may serve as guidance in facilitating the strategic adoption of eco-innovation practices in firms' transition to a CE. Research limitations/implications: The sample of companies that participated in the triangulation is exploratory; however, this limitation is overcome by reviewing academic literature and institutional reports. On the other hand, academics could expand the selection of tools with subsequent studies. Practical implications: The current study is based on the triangulation method, which was vital to balance the theory and practice provided by academic sources, reports, and books. In addition, this study has improved our understanding of the goals or intentions that may motivate firms to implement the CE and align them with the suggested set of tools. Consequently, this study is relevant to support practitioners in selecting a tool based on the goal they want to achieve towards circular economy implementation. Social implications: This research suggests several tools; however, each organization could adapt some that it already knows. Therefore, firms and implementation leaders should customize the circle with short lines in each case. Moreover, the clock bells represent the deadline considering that every CE implementation process requires a deadline to ensure its success in micro-level or firms. Originality/value: The "circular clock" provides a didactic way for sustainability leaders, consultants, or companies to facilitate the implementation of the circular economy by choosing the field of action on which they want to focus and the most appropriate tool according to their strategy, objective, and budget. Therefore, this model is based on the balance between theory and practice. [ABSTRACT FROM AUTHOR]

This paper aims to analyze organisations' behaviour in the Industrial Symbiosis implementation process in the Circular Economy Pilot Project, in Brazil from the actors' perception. We conducted an exploratory and descriptive study with a qualitative approach to attain the research objective. The data collection involved in depth interviews with eighteen actors. Data were analyzed using the Content Analysis technique. The study results in show a still incipient industrial symbiosis network, with few connections between industrial actors, based on bilateral exchanges of materials, water and energy. From the analysis, it was possible to identify the elements that influence the behaviour of organisations. When it comes to exogenous elements, it is clear that laws and sanctions are the ones that most determine organisational action. However, this pressure is still focused on the traditional and unidirectional model of production processes. Economic viability was identified as a primary factor for the objective elements of organisational action. Regarding the subjective elements, it was found that there was already an interaction before the project between some companies, especially those from automotive sector. With the project's initiative, this social interaction was intensified, including between companies from different sectors. Regarding the barriers, we found the absence of governmental actions, unavailability of time and involvement of the managers to fully participate in the project, high cost of waste disposal versus the cost of investment and, discontinuity of actions. Overall, the study indicates that the project increased the institutional capacity of the region to develop industrial symbiosis, as it advanced in sharing new knowledge, promoted more significant interaction between organisations and identified business opportunities for companies. However, it appears that the project's continuity will be conditioned to improve some aspects of the governance structure, regulatory framework and collective engagement. These results can be helpful for researchers studying this topic and managers in Brazil and other emerging countries in Latin America, as well as, policymakers involved in public policies aimed to enable the transition to a circular e more sustainable model. [ABSTRACT FROM AUTHOR]

Climate change and resource scarcity are just two of the planetary crises that make radical socio‐economic change essential if human society is to be sustainable. Chemical engineering is a skill‐set that can make a unique contribution to the socio‐economic transition, going beyond new technological processes to provide a system‐level understanding of economic activities from the perspective of industrial ecology. This paper provides an example by applying process system analysis to the use, re‐use, remanufacturing, and recycling of material products. Unlike the 'circular economy' approach, the analysis starts from the stock of goods and materials in use in the economy and models the flows required to build up, operate, and maintain the stock. Metrics are developed to account for the effect of stock growth on demand for materials. The significance of the analysis is illustrated for four metals whose industrial ecologies are at different levels of maturity: lead, copper, aluminium, and lithium. Extending product life through re‐use and remanufacturing is crucial for resource efficiency, using labour to reduce demand for energy and non‐renewable resources. If end‐of‐life products are processed to recover individual elements, the cost penalties increase rapidly with the decreasing concentration of valuable materials and increasing number of materials in the mixture. Thus, shifting from a linear economy (make−use−dispose) to closed‐loop use of materials involves rethinking product design to reduce the number of materials used. Material substitution to reduce demand for scarce materials needs to look beyond equivalence of function to consider changing patterns of use in the regenerative economy. [ABSTRACT FROM AUTHOR]

Material flow analysis (MFA) is the main methodology to assess material flow circularity. It is essentially a data-analysis-based approach whose physical foundations consist of conservation of mass. To improve both the accuracy and the repeatability of MFA models, in this paper we leverage compartmental dynamical thermodynamics merged with graph theory and control theory. The key idea is that the thermodynamic compartments and their connections can be added, removed or modified as needed to achieve a circular material flow. Thus, our methodology consists of designing thermodynamical material networks (TMNs). We also provide a physics-based definition of circularity and implement a nonlinear compartmental control, which has been possible since TMNs are highly dynamic models based on differential calculus (i.e. ordinary differential equations) rather than on arithmetic as is typical for MFA models. As we envision scalable and repeatable designs of TMNs, we made publicly available the paper source code.

By combining the relevant theoretical foundations such as fuzzy algorithm and water resources environmental management, and selecting the actual water resources integration data, this paper establishes an index system to investigate the carrying capacity of the water environment in this area. Through the study and application of the comprehensive multilevel fuzzy evaluation model, based on scenario analysis, the current situation of water resources environmental management and the temporal and spatial variation characteristics of water resources in the study area in recent years were evaluated. In order to observe the differences more accurately in the spatial structure of water use in the study area through information entropy, ArcGIS IS images were drawn according to the calculation results of the urban degree balance in the study area. In the development of circular economy, the information center plays an important role in the industrial ecosystem, which is the basis for the recycling of materials, energy, and water. By building a unique data platform, it can help companies understand the latest status of logistics, energy, and waste recycling in the park and can make adaptive adjustments to the above conditions, to achieve the sustainable development of the overall industrial chain. [ABSTRACT FROM AUTHOR]

The use of biodigesters and the circular economy (CE) has been gaining attention in recent years. Both biodigesters and CE have the potential to minimize negative impacts—not only environmental, but also economic and social. However, little attention has been paid to the relationship between biodigesters and CE. Therefore, the objective of this paper is to identify and analyze the implications of the use of biodigesters in the light of a CE concept. To do this, a SWOT matrix was developed based on the opinion of experts and two case studies were conducted in companies operating in different sectors in Brazil. The results showed that the use of biodigesters can drive CE through biogas, which is a renewable energy source, closing the cycle of organic materials, increasing the economic power of companies and small producers, improving basic sanitation in remote areas, and stimulating industrial symbiosis. However, this study identified barriers in the use of biodigesters in the context of CE, such as lack of government incentives and composting being shown to be more cost-effective than the use of biodigesters for the treatment of solid waste. [ABSTRACT FROM AUTHOR]

The twentieth century was characterized by an increase in research studies concerning the interactions between economic system growth and environmental deterioration issues. Faced with this background, circular economy (CE) and its industrial ecology (IE) pillar seem to be an efficient way to achieve sustainable development within the industrial sector. IE consists of optimizing the networking among industries by using energy and material exchange, which are generated from by-products and waste stocks. It aims to improve the environmental potentialities of integrated clusters called eco-industrial parks (EIPs). Policy in the European Union countries and in French territories has positively influenced such EIP implementation by the establishment of a set of measures to develop the industrial symbiosis performances. The present paper reviews the key drivers to identify the methods and tools to integrate the life cycle thinking approach that defines the following five phases: design, layout, commercialization, operating and renewal phases. A toolbox for developing an EIP from scratch according to French policy is developed and discussed. This study defines a framework involving a factual eco-industrial park and network. The industrial application is a new EIP, namely "Les Portes du Tarn". It is located in the south of France and acts as an experimental field. The paper provides current results for commercialization and operating, including a model of an organizational process, a decision-making process, information technology tools and systems to manage sustainable development. It highlights the CE and IE challenges surrounding enhancing the social acceptability of an industrial park project through adaptation of a relevant governance model and establishment of a continuing collaborative context and trust relationship between diverse actors. The first candidate companies' achievements are discussed and demonstrate the first benefits of toolbox. The paper delivers a toolbox, feedback and some good practices to support the development of EIP project from greenfield. [ABSTRACT FROM AUTHOR]

Identified as critical for sustainable development, ecosystem services are increasingly being put on the policy agendas of governments and corporations. China is now facing serious environmental challenges caused by losses of ecosystem services and recently has recognized that the country is reaching its environmental capacity. The circular economy (CE) has been positioned as a key strategy for national economic and social development by the national government as a way to resolve problems of resource depletion and environmental pollution. It will be increasingly critical to link ecosystem services to the CE. This means that the CE needs to be expanded to include restoration and regeneration of ecosystem services. This paper proposes a framework comprised of components including policies, governance, techniques and technologies, business development, key actors and support organizations for incorporating ecosystem services into the CE and focuses on industrial ecosystems, specifically eco-industrial parks (EIPs), as microcosms of a CE. Taking China as an example, this paper explores whether this framework can be applied to EIPs. The paper concludes that there are many opportunities to apply the framework to China’s EIPs. [ABSTRACT FROM AUTHOR]

Industrial ecology (IE) education is a topic that has received attention in institutions of higher education throughout the world. Some universities have been teaching and researching IE for the past 20 years but its scope is still being defined. There is a need to catalog and exchange experiences of IE teaching and their results. Based on a literature review, this paper aims to provide a framework composed of content and strategies for IE teaching. This framework is tested in teaching IE as a general education course for undergraduate students at Beijing Institute of Technology (BIT). The methodology applied in this paper is of a descriptive and empirical nature and thus this paper focuses on a practice-oriented perspective in describing the experience of BIT. A range of different strategies, including lectures, group discussions, case studies, role playing games, oral presentations, evaluation, and student feedback have been incorporated in the course. The results show that the course received a highly positive evaluation by the participating students. Students were impressed by IE's characteristics of interdisciplinarity, ways of thinking, and practical value. Additionally, the course appears to influence students' values, attitudes, and behavioral intentions. The paper concludes with some thoughts on ways of improving IE education in the future. [ABSTRACT FROM AUTHOR]

Circular Economy (CE) builds on the Industrial Ecology (IE) framework by taking a comprehensive approach to reducing waste, pollution, and pressure on natural resources within the broader multi-stakeholder production-consumption loop. Despite the potential benefits of CE, previous research has identified technical, organizational, and institutional challenges that hinder its widespread adoption. In this paper, we investigate how the cultural dimension of CE (e.g., stakeholders, socioeconomic interactions, values, and institutions), as opposed to its technical dimension (e.g., industrial symbiosis, reduce, reuse and repair), were addressed in previous literature, and show how applying Dewey's pragmatist philosophy to CE can facilitate its adoption beyond idealistic aspirations. To do so, we conducted a content analysis of 69 studies focusing on the definition and implementation of CE from technical and cultural perspectives. The findings show that environmental and efficiency motivations alone are insufficient for the successful large-scale implementation of CE. The cultural dimension of CE, encompassing the stakeholders involved in the production-consumption loop, their social and spatial relations, as well as the institutions and policies that govern their economic activities, is also essential to consider for effective CE implementation as it can be impacted by and impact CE. The paper concludes by discussing the contribution of a pragmatist perspective in taking the cultural dimension into account to advance national and subnational CE transition agenda. [Display omitted] [ABSTRACT FROM AUTHOR]

Although the Circular Economy (CE) has made remarkable technological progress by offering a wide range of alternative engineering solutions, an obstacle for its large-scale commercialization is nested in the adoption of those business and financial models that accurately depict the value generated from resource recovery. Recovering a resource from a waste matrix conserves natural reserves in situ by reducing demand for virgin resources, as well as conserving environmental carrying capacities by reducing waste discharges. The standard business model for resource recovery is Industrial Symbiosis (IS), where industries organize in clusters and allocate the process of waste matrices to achieve the recovery of a valuable resource at an optimal cost. Our work develops a coherent microeconomic architecture of Chemical Leasing (Ch.L.) contracts within the analytical framework of the Sherwood Plot (SP) for recovering a Value-Added Compound (VAC) from a wastewater matrix. The SP depicts the relationship between the VAC's dilution in the wastewater matrix and its cost of recovery. ChL is engineered on the SP as a financial contract, motivating industrial synergies for delivering the VAC at the target dilution level at the market's minimum cost and with mutual profits. In this context, we develop a ChL market typology where information completeness on which industry is most cost-efficient in recovering a VAC at every dilution level determines market dominance via a Kullback–Leibler Divergence (DKL) metric. In turn, we model how payoffs are allocated between industries via three ChL contract pricing systems, their profitability limits, and their fitting potential by market type. Finally, we discuss the emerging applications of ChL financial engineering in relation to three vital pillars of resource recovery and natural capital conservation. [ABSTRACT FROM AUTHOR]

Circular economy (CE) is gaining popularity at different levels with the promise of creating more sustainable processes. In this context, cities are implementing a number of initiatives that aim to turn them into sustainable circular systems. Whether these initiatives achieve their sustainability goals, however, is largely unknown. Nevertheless, as the application of CE strategies is actively encouraged by many policies across the globe, there is a need to quantify the environmental impacts and to identify the strategies that support urban sustainability. This paper analyses the extent to which research focuses on quantifying the environmental balance of CE initiatives promoted at the municipal level. To this end, the analysis scanned CE initiatives reported in cities around the globe and classified them into urban targets and CE strategies. In parallel, the paper conducted a review of the literature that uses industrial ecology tools to account for the environmental impacts of CE strategies. Results show a diverse geographical representation, as reported cities concentrated in Europe, whereas for environmental research, the main results came from China. In general, cities encourage strategies relating to urban infrastructure (47%), with and additional focus on social consumption aspects, such as repair and reuse actions. In comparison, research mainly addressed industrial and business practices (58%), but the approach to infrastructure was similar to that of cities, both with a special interest in waste management. Research has yet to assess social consumption and urban planning strategies, the latter essential for defining the impacts of other urban elements. Hence, there is a need to define the environmental impacts of the strategies that cities select in their quest for circularity. Research and practice can also benefit from working collaboratively so as to prioritize the CE strategies that best fit into the features of each urban area. [ABSTRACT FROM AUTHOR]

[Display omitted] • Develops a multi-objective model considering all sustainability pillars. • Discusses the importance of combining an ORC system with energy symbiosis. • Analyzes demand fluctuations and supply disruption effects on recovering energy. • Proposes a credibility-based robust interval type-2 fuzzy-robust solution approach. • Considers different scenarios regarding operational risks in practice. Industrial symbiosis (IS) integrates multiple industries to share resources (e.g., energy, water, by-materials) for economic and environmental reasons. Energy demand is dynamic, imposing financial and logistical barriers to achieving Circular Energy (CEn). This paper addresses this by proposing a new framework that integrates central heating networks of an Organic Rankine Cycle (ORC) system to recover unused low-temperature energy. The framework is formulated as a stochastic programming problem to capture the uncertainty of some parameters to reduce the costs arising from fluctuations in energy supply and demand and, subsequently, wasted energy. Disruption management is also applied to handle the risk of suppliers becoming unavailable due to unforeseen events. The proposed multi-objective mixed-integer linear programming model optimizes the conflicting sustainability value preferences in the IS-based CEn network. The paper presents a novel robust possibilistic programming technique to control the epistemic uncertainty of the developed mode and develops a robust variant of the augmented ε-constraint algorithm (AUGMECON-R) to obtain the Pareto optimal solutions. The results provide a new platform for reducing the undesirable effects of worst-case energy symbiosis scenarios. The results show that using ORCs in an IS network increases the economic benefits of such a system by about 20% and reduces customer dissatisfaction from energy supply disruptions by about 27%. [ABSTRACT FROM AUTHOR]

Understanding which drivers and barriers exist in the development of a circular economy (CE) is a relevant and timely endeavour. The aim of this paper is to contribute to this debate by analysing evidence regarding the different factors helping and hampering the development of a CE. Specifically, this paper focuses on the eco-innovation (EI) pathway towards a CE, and tries to coordinate available but fragmented findings regarding how “transformative innovation” can foster this transition while removing obstacles to sustainability. Drawing upon a new corpus of both academic and non-academic literature, this work offers a framework for analysis, as well as an evidence-based survey of the challenges, for a green structural change of the economy. We argue that the combination of the innovation systems' view with the more recent “transformation turn” in innovation studies may provide an appropriate perspective for understanding the transition to a CE. Ultimately, the paper aims to capitalise on these insights to contribute to the design of policy guidelines and organisational strategies. [ABSTRACT FROM AUTHOR]

Industrial symbiosis is realised when companies work collectively and collaboratively to establish ‘waste-to-resource’ exchanges with one another. In previous work, we presented the architecture of a collaboration platform that allows companies to simulate and analyse the economic viability of establishing such waste-to-resource exchanges in the By-product Exchange Network (BEN) model. In this paper, we describe how we enhance the platform with a database engine for waste-to-resource matching. The database engine aims to fill the gap in information and knowledge of what valuable resources can be recovered from wastes or by-products, and what wastes or by-products can be used as substitute raw materials, and what technology or processes are required to make the waste-to-resource conversion happen. The database engine is built on a graph database that models and stores data for waste-to-resource matching, and comprises a query processor for determining the matches from the stored data. The database engine is implemented as a web application and demonstrated through use cases based on paper and food wastes. [ABSTRACT FROM AUTHOR]

A strategy supporting the development towards a circular economy is industrial symbiosis (IS). It is a form of collaborative supply chain management aiming to make industry more sustainable and achieve collective benefits based on utilization of waste, by-products, and excess utilities between economically independent industries. Based on an extensive analysis of published studies on existing IS collaborations and interviews with central stakeholders of a comprehensive IS, this paper investigates IS from a supply chain collaboration perspective. A theoretical framework is built and used to discuss how industrial symbiosis pursues sustainability and to identify the main collaboration aspects and performance impacts. This framework is then used in the analysis of selected published cases. Based on this, we derive propositions on the organizational and operational requirements for collaboration in the context of IS networks, related to the supply chain integration and coordination practices. As IS has only received little attention in the operations and supply chain management community, our propositions directly lead to future research directions. Furthermore, the analysis in this paper provides directions to increase the feasibility and resource efficiency of IS networks and can hence be used by stakeholders involved in these networks. [ABSTRACT FROM AUTHOR]

As the circular economy (CE) gains traction in literature and practice, several academic communities are opening up spaces that move away from the CE as a pure engineering concept. This systematic literature review (n = 77) analyses and discusses the fragmented body of knowledge on the meso-level of supply chains (SCs): (a) to find common ground that underpins the current implementation of the CE on this level; and (b) to identify drivers, inhibitors, and enablers from which CE SC configurations emerge. The review finds that there remain differences in CE definitions that result from claimed antecedents and scopes, resulting in distinct research streams. On the meso-level, eco-industrial parks, environmental SCs, and closed-loop SCs each face significant challenges. The latter potentially offers the largest environmental benefits but engenders radical changes for business models and exposes SCs to more risk. We firstly argue for moving away from using a prescriptive set of practices as definitions for the CE towards a set of overarching goals to allow for the inclusion of future practices and techniques. Secondly, we highlight that research going beyond the meso-level to consider the wider social and institutional environment is needed to solve current challenges. [ABSTRACT FROM AUTHOR]

As a collective approach for achieving economic, environmental, and social effects, industrial symbiosis is considered an important tool to realize a circular economy. In both literature and practice, the need for a third party facilitating the development of these resource exchanges between companies has been highlighted. This paper explores the actions and skills needed for achieving successful facilitation of industrial symbiosis by unfolding the facilitator role. It develops an analytical action-skill framework by systematically examining the relevant literature and conducting an in-depth analysis of a Danish facilitation team, and tests the developed action-skill framework by analyzing experiences obtained from seven facilitators in Nordic countries. In doing so, the study reveals a variety of actions of the industrial symbiosis facilitator that can be identified across literature and practice, belonging to five overarching tasks: Developing linkages, coordinating, capacity & knowledge management, value assessment & distribution, and developing beneficial conditions & scaling up. The results indicate that we observe a role in the process of homogenization. Another contribution is the uncovering of industrial symbiosis facilitator skills. The paper points to five overarching skills that are relevant to the facilitator role: Social skills, work approach, motivation & interest, ethics & responsibility, and knowledge. Subsequently, eight specific tensions between the identified actions are discussed. These make the role of the industrial symbiosis facilitator skill demanding and context-dependent and show an additional, implicit skillset. [Display omitted] • Literature describes Industrial Symbiosis Facilitators' actions, but not skills. • Nordic IS facilitation practice revealed skills and details on actions of the role. • The facilitator role is in a process of homogenization. • IS facilitation is skill-demanding and context dependent. • Crucial skill categories: Social skills, work approach, motivation, ethics, knowledge. [ABSTRACT FROM AUTHOR]

Industrial Symbiosis (IS) projects are today well known for their contribution to sustainable development. Designing IS projects implies modelling the quantity of material flows between economic components (ECs), in particular to evaluate the environmental and economic gains obtained through more material circularity and use efficiency. The Industrial Symbiosis concept is now being applied to activities distributed over territories much wider than industrial parks. For such setups, existing modelling methods are becoming strained by the number of economic components involved, their dissemination within heterogeneous landscapes and the resulting complexity of the exchanges. In this paper, we propose a generic, spatially explicit simulation model based on stakeholder decision rules to study regional scale flows quantification between ECs in n-n IS networks. Our approach introduces the use of the Gale-Shapley stable matching algorithm for addressing the many-to-many supply-demand matching problem. The method is deterministic and provides stable solutions that optimise the individual objectives of the ECs. A second introduction considers using transport cost along the road network among the decision rules when ECs preferences are ordered. This solves the issue of correctly estimating travel distance in heterogeneous landscapes where it can be significantly different to the distance as the crow flies. We tested the model with the implementation of two real and concrete case studies related to the bioeconomy of a tropical island: (i) collective storage of fodder and (ii) co-composting platforms. The outputs of the model make it possible to compare scenarios based on EC satisfaction relative to supply and demand as well as the total distance travelled along the road network. Finally, we discuss the limitations and genericity of the model to explore diverse industrial symbiosis projects. • Industrial symbiosis material flow modelled using stakeholder decision rules. • Our approach is spatially explicit, determinist and based on interactions. • Stable deferred acceptance matching algorithm used to link economic components. • Decision rules incorporate transport costs estimated based on the road network. • Model tested in n-n networks involving several thousand components at regional scale. [ABSTRACT FROM AUTHOR]

Circular Economy (CE) has gained great traction over the past few years and is increasingly seen as a way to achieve sustainable development. However, the implementation of CE initiatives often leads to rebound effects (RE), which limits the sustainability potential of CE. Despite the vast literature on rebound effects across several disciplines, such as ecological economics and industrial ecology, there is still a limited understanding regarding the occurrence of rebound effects within a CE context. This paper provides a systematic literature review (SLR) of RE with a particular focus on: (i) definitions; (ii) triggers and drivers; (iii) types and mechanisms; and (iv) measurement approaches. On the basis of the results of the SLR, a conceptual framework of RE is proposed. Furthermore, several gaps for RE research within CE have been identified and lead to the proposition of a number of potential research avenues: (1) expand the research scope and level of analysis to a systemic view; (2) enhance the understanding of RE triggered not only by efficiency, but also effectiveness and sufficiency; (3) expand the time horizon considered for the analysis, so to account for possible delays in the system; (4) deepen the understanding of the relationships between RE and all sustainability dimensions; (5) strengthen the research on the meso level; (6) account for the importance of system structure and system behaviour in the occurrence of RE; (7) model the causal dynamic relationships between important variables to anticipate the potential occurrence of RE; (8) develop robust approaches to estimate the potential RE triggered by CE initiatives. By consolidating the state-of-the-art within RE research and identifying the research directions for exploring RE within CE, this paper establishes a solid foundation for future research in the field. • Research on rebound effects of the Circular Economy (CE) is still scarce. • Rebound effect research across various disciplines provide the foundation for CE. • Design of a conceptual framework for research on rebound effects. • Consolidation of eight research avenues for uncovering the rebound effects of CE. [ABSTRACT FROM AUTHOR]

An Eco-Industrial Park (EIP) is composed of a number of Industrial Symbiosis (IS) instances, which allow energy/material exchanges among the different industrial enterprises (Individual Actors, IA) therein. By so doing, IA's economic and environmental performances can be improved. Despite recent methodological advancements, the existing approaches to EIP design optimization are still suffering from several major problems: (i) dominance of the global EIP optimum over the local IA optimum, (ii) limited number of optimization objectives falling into the categories of economic and environmental objectives and (iii) EIP optimization performed without considering possible operational uncertainties. In addition, the adoption of the bio-inspired concept of IS makes EIP evolve from classical engineered systems towards complex engineered systems, with associated static and dynamic complexity characteristics. To highlight and understand the complexity features of EIP, in this paper we present them as intelligent networks for multiple energy and material exchanges, drawing a parallel with another typical complex system, that of the electric power network, in its modern Smart Grid (SG) concept, conceived to improve and optimize the distribution and use of electrical energy. Then, the modelling and optimization framework proposed in this paper adopts a more systematic methodology for accounting of the EIP complexity characteristics and addressing the associated optimization challenges. The proposed approach allows ensuring a sustainable and robust EIP design, thanks to the due account given to the related uncertainties and risks, e.g., due to major changes in the regulatory context and IA operational strategies, failures of interconnections among IA, interruption or shutdown of IA operation. [ABSTRACT FROM AUTHOR]

Papermaking is regarded as an industry that consumes a great amount of energy and produces serious pollution. The papermaking industry in China, which has a large population and rapid economic development, is indispensable and presents a trend of rapid development. China and the rest of the world pay considerable attention to resource conservation and environmental protection. Therefore, determining how the papermaking industry can realize cleaner production and sustainable development is an urgent issue that should be addressed. This paper introduces Guangdong Silver Island Lake (GSIL) Papermaking Park, which realizes cleaner production and sustainable development by developing circular economy (CE). This park constructs a CE industrial mode by recycling energy, water, and materials. After 10 years of implementation, the CE plan of GSIL Papermaking Park has integrated the resources of the papermaking and power industries horizontally, thus forming the unique development mode of its CE. The resource consumption, resource comprehensive utilization, and pollutant emission indexes of the park have reached the advanced level in the papermaking industry of China. [ABSTRACT FROM AUTHOR]

In previous work, we presented a web-based graph database engine to enable companies to find pathways to convert their wastes to resource to enable industrial symbiosis (IS). In this paper, we extend the database to include water streams, and cost and carbon footprint (CFP) of pathways for waste-to-resource conversion. To support companies' decision making for waste-to-resource conversion pathways, we enhanced the database query processor based on a graph algorithm to identify eco-efficient pathways to convert waste to resource based on user's preference. We demonstrate the application of this methodology using a case study of wastewater to water resource. [ABSTRACT FROM AUTHOR]

Industrial ecology addresses newer business models that improve flows of energy, water, and materials, mimicking interconnections found in natural systems. Businesses can function interdependently to extend the life cycle of resources by setting up systems to repurpose waste or transfer a byproduct of manufacturing as an input for creating another product. Although the extant literature focuses on the role of businesses in closed-loop processes, governments can catalyse sustainable entrepreneurship to transition to a circular economy. There is a limited understanding of how public–private partnerships can facilitate this shift in small and medium enterprises. Multiple case studies were conducted to examine industrial ecology projects that were spearheaded by a state grant scheme in Australia. The long-term progress in establishing initiatives across commercial and industrial projects was monitored. The findings show government incentives to start up projects facilitate conditions to develop technology and other capabilities for responsible production and consumption. This study extends the theory of innovation ecosystems into practice. The model demonstrates that sustainable value for business and society can be realized through financial support and collaboration that enables entrepreneurship and drives circularity across cities and regions. [ABSTRACT FROM AUTHOR]

This paper aims to summarize, propose, and discuss existing or emerging strategies to shift towards a circular economy of materials. To clarify the landscape of existing circular practices, a new spectrum is proposed, from product-based strategies, where entire products go through several life cycles without being reprocessed, to material-based approaches, extracting, recycling, and reprocessing materials from the waste flow. As refillable packaging does not lose any functionality or value, when re-used through many life cycles, product-based strategies are globally extremely efficient and must be promoted. It appears however that their implementation is only possible at the scale of individual products such as packaging containers, relying on the cooperation of involved companies and consumers. It appears more and more urgent to focus as well on a more systematic and flexible material-oriented scheme. The example of circular glass recycling is a success in many countries, and technologies become nowadays available to extend such practices to many other materials, such as rigid plastics. An ideal would be to aim at an economy of materials that would imitate the continuous material cycle of the biosphere. Technological and business strategies are presented and discussed, aiming at a relevant impact on circularity. [ABSTRACT FROM AUTHOR]

Abstract Considerable efforts are undertaken to make the transition towards a more Circular Economy (CE). At the same time there is no generally accepted monitoring framework. Rather, what exists is a large variety of measurement approaches that aim to assess the progress. The different assessment methodologies cover different and varied aspects of the CE transition and are seemingly unrelated to each other. Therefore, the main contribution of this paper is the provision of a structured picture of the current stock of CE metrics, including the identification of methodology clusters and the related assessment perspectives. The method of Multiple Correspondence Analysis (MCA) was used to assess 63 CE metrics and 24 features relevant to CE, such as recycling efficiency, longevity and stock availability. The MCA was used to assess how the different CE features are associated to each other and how they are related with each of the 63 metrics. Also, it was determined which combinations of CE features are frequently assessed together. The analysis identified three main clusters of metrics, (1) a resource-efficiency cluster, (2) a materials stocks and flows cluster, (3) a product-centric cluster. The results of the analysis show poor integration of resource-efficiency and product-centric perspectives, while the product-centric and system-dynamic perspectives are least frequently assessed. Further, the analysis provides the most prevailing CE perspectives and it is shown that only a few CE metrics assess CE features that are related to the maintenance of value. The MCA provides a guidance for further metrics development, as it identifies areas with a lower metrics density. For a detailed analysis, a standardized visualisation framework for CE metrics is derived, which allows to compare individual metrics in a simple and illustrative way. The goal of the visualisation framework is to provide guidance for (i) the integration of the most complementary CE metrics and (ii) facilitate further metrics development. Highlights • Structuring of 63 circular economy (CE) metrics along 24 identified CE elements. • Identification of three main clusters of CE metrics and their typical CE elements. • Visualisation framework for a detailed assessment and design of CE metrics. • Identification of most prevailing CE perspectives and their associations. • Guidance for case-specific and complementary selection of CE metrics. [ABSTRACT FROM AUTHOR]

This paper shows how to constructively engage with waste and resource management frameworks, by clarifying their role in the societal discourse on waste and resources, providing insight into their step-based structure, and how they draw on different definitions of ‘waste’ and ‘resource.’ Through use of the concepts of ‘frame,’ ‘collective action frame’ and ‘logics,’ a language and conceptual toolbox is made available that facilitates a constructive debate around such frameworks. Ten waste and resource management frameworks are included here, among which are the five frameworks that are part of the synthesis of the Ellen MacArthur Foundation's Circular Economy framework: Cradle-to-Cradle™ by Braungart and McDonough, the Performance Economy by Walter Stahel, the Blue Economy by Gunter Pauli, Regenerative Design by John Lyle and the Industrial Symbiosis framework. A case is made for the careful consideration, creation, use and further development of such frameworks and directions are provided for the further development of the CE concept into a robust concept. [ABSTRACT FROM AUTHOR]

Circular economy (CE) describes a sustainable alternative approach to the current linear economy system. It is a growing topic among scholars, practitioners, and decisionmakers; it encompasses several concepts related to sustainability and requires the synergy of multiple actors for success, including higher education institutions (HEIs) as one of the most relevant ones. Current CE is based mostly on experiences in Global North developed countries, where the concept has gained great attention and has already influenced policies and strategies. However, CE in Latin American countries (LA countries) have not yet received such attention. Thus, some "unique problems" may remain unattended, and efforts to attain a CE are more likely to fail. Likewise, the study shows how the role of HEIs in CE in LA countries has not yet been fully explored, as the literature on this topic is scarce. This paper aims to address the main research question: what is the role of HEIs in the transition to a CE in Latin American countries? For this, a two-fold methodology was performed: (i) a systematic review which allows understanding of the trends of CE research in LA and the extent of the HEIs involvement; and (ii) a narrative review, which provides insights into the state of the art of CE research (gaps, drivers, and barriers) in LA countries and how this relates to HEIs. This approach drew implications for the role of HEIs in the implementation of CE in LA countries. HEIs are key actors in this transition, contributing in several ways to the CE by collaborating with industry, assisting policy makers, building human and intellectual capital, supporting community engagement projects, influencing campus culture, linking with international CE networks, and promoting an inclusive CE discourse. This research contributes to the CE body of knowledge from a Latin-American Global South perspective by discussing the factors that aim to define the role of HEIs in the CE transition in LA countries. [ABSTRACT FROM AUTHOR]

This paper aims to investigate the valorisation opportunities for the secondary metallurgy slag (SMS) as a by-product of electric arc furnace (EAF) steel production. The key stakeholders, their aim and possible configurations of the SMS value chain are identified considering the treatment unit owners and locations, pre-treatment and treatment processes, and collaboration aspects. A multi-criteria Analytic Hierarchy Process (AHP) model has been developed to evaluate value chain configurations according to criteria such as technology, legislation, economic and environmental sustainability, and supply chain. This approach helps analyse the impact of circular economy practices and the opportunities for industrial symbiosis in the European steelmaking areas. The AHP model was tested on the case of Lombardy region that is one of the major European hubs for EAF steel production. Knowledge was collected and formalized from interviews with several experts. The results show economic sustainability has the highest impact on the SMS value chain, followed by CO 2 emission and water consumption. The ranking of SMS value chain configurations shows that a pre-treatment phase is essential since it facilitates SMS logistics management and has environmental advantages. A collaborative approach among steel producers or with external recyclers is preferred when there is the readiness of the ecosystem, hardware infrastructure, and legislation about product certificates and operations. In a collaborative system, a value chain consisting of a third-party industry for SMS recycling is preferred to a consortium of producers due to the broader market coverage, environmental sustainability, and higher profits for the recycler. The multi-criteria combined with the multi-expert modelling approach helps balance the importance of different criteria from the actors' points of view, such as steel producers and technology providers. From the theoretical point of view, the analysis shows how an SMS collaborative ecosystem integrated with two recycling facilities reinforces the steelmaking business profitability, market potential, and environmental-friendly solutions. This study can help steel producers decide on the feasibility and profitability of treatment units, collaborating with other producers, or selling SMS to recyclers. In addition, policymakers can analyse the regional perspective, identify potential industrial sectors, and explore new business models. [ABSTRACT FROM AUTHOR]

The need for sustainable production, efficient use of resources, energy efficiency and reduction in CO2 emission are currently the main drivers that are transforming the European process industry besides Industry 4.0. Since the potential of industrial symbiosis (IS) and energy efficiency (EE) about environmental, economic and social issues has been discovered, the interest in them is gradually increasing. The funding and investments for IS and EE are highly encouraged by the European Commission, while more and more policies as well as research and innovation (R&I) activities are initiated to promote European industry's advancement towards a circular economy and CO2 neutrality. The aim is to maintain the competitiveness and economic progress of the industry. The key to build a competitive and sustainable European manufacturing industry is to create a competent, highly qualified workforce that is capable of handling the new business models coming with IS and EE requirements and digital technologies. We can generate this by identifying the skills needs and upskilling and reskilling the current workforce accordingly by delivering the suitable training programmes. Therefore, this work identifies the most critical skills needs related to IS and EE for six different energy-intensive sectors (steel, ceramic, water, cement, chemical and minerals) in Europe. The effect of the digital transformation on the skills needs is as well discussed. The identified skills are aimed to be included in vocational education and training (VET), tertiary education and other kinds of training curricula. We also identify the cross-sectoral most representative job profiles linked with EE and IS in these sectors and demonstrate the methodology for the selection process. Furthermore, we present a key tool for identifying the most significant current and future skills requirements. Also, we define the critical skill gaps of the European process industry using this tool. Once the skill gaps are defined, they can be reduced by delivering well-developed continuous trainings. We also link our work to the respectable ESCO, the European Classification of skills, competences, qualifications and occupations, to attain a common ground with other studies and frameworks, minimise the complexity and contribute to their work. Our work is developed to be an academic and industrial guideline to prepare well-developed training programmes to deliver the needed skills. [ABSTRACT FROM AUTHOR]

This paper aims at comparatively analyzing the IS process in three remarkable empirical cases. Ostrom's Institutional Analysis and Development framework and its categories for analysis are used to understand each process. A theoretical and analytical framework is proposed based on a survey of contextual elements that shaped the behavior of organizations towards Industrial Symbiosis practices. The results show that although there was no clear, linear order in which the actors developed symbiotic relationships, the decisions related to Industrial Symbiosis are shaped by a similar set of variables. These variables range from technical and economic aspects, such as the diversity of industries and the viability of exchanges, to social and institutional aspects, encompassing critical environmental issues; bilateral agreements; collective engagement; trust to build cooperative relationships; communication and information sharing strategies; integrated regulatory framework at three levels; congruence between government and company actions to create a cooperative environment; and governance structures involving local government, companies, research and development institutions, and a coordinating entity or the champion. This framework may serve as a reference for diagnostic analyses assessing aspects that can be improved wherein Industrial Symbiosis is already underway. It may also be useful in prescriptive analyses assessing the potential for implementing IS. [ABSTRACT FROM AUTHOR]

Mobilizing industry and transforming industrial sectors to a circular economy (CE) is one of the key areas of activities in the European Green Deal (EGD)—the newest strategy of economic growth in European Union (EU). In the CE, the raw materials that can be recovered from various waste streams play a key role, therefore, recommendations for their management were developed, both at the European and national level. In Poland, the raw material recovery sector is one of the strategic sectors (key industries) described in several documents determining the further directions of economic growth in the country. This paper presents the revision of these documents and guidelines for the implementation of the CE in the raw material recovery sector. The scope of the paper also includes a description of the current state of the raw materials recovery sector and its return, supported by the analysis of drivers and barriers in its further development. In previous years, a dynamic development of the recovery industry was observed, followed by formation of new companies (dominated by medium-sized companies comprising ~50% of entities in the sector) and increasing amount of people employed (~70,700 people). A growing level of processing of secondary raw materials with the use of more and more innovative technologies has been observed, which could contribute to the improvement of the level of innovation of the national economy. There also some barriers, such as the lack of sufficiently developed industrial symbiosis (IS) and long-term support for the implementation of recovery technologies. The growing ecological awareness of society and enterprises themselves, as well as the growing belief in the importance of resource recovery for environmental protection, suggest the possibility of subsequent development of the raw materials recovery sector. Further actions in this field will be taken to strengthen the implementation of the CE in the country. [ABSTRACT FROM AUTHOR]

The growing importance of the concept of the circular economy as a way to attain sustainable development has encouraged scholars to propose different ways to understand it. Given the large number of studies done on the circular economy, their differing approaches and their multiple applications, this paper attempts to propose a consensus view of the basic notions of the circular economy framework and highlight its relationship with eco-innovation. To that end, this study carried out a systematic literature review that resulted in four main outputs: a knowledge map of the circular economy, an analysis of the main notions of the concept, principles, and determinants of a circular economy. Finally, this study brings to light some remarkable examples of eco-innovations developed for implementation in the circular economy. [ABSTRACT FROM AUTHOR]