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[Display omitted] • Systematic integrated system would provide proper utilization of waste. • Coupled AD and pyrolysis processes will promote concept of circular bioeconomy. • Elaboration of integrated system by suitable kinetic and mathematical models. • Framework of techno-economic analysis for integrated system is discussed. Agricultural and food waste have become major issue affecting the environment and climate owing to growing population. However, such wastes have potential to produce renewable fuels which will help to meet energy demands. Numerous valorization pathways like anaerobic digestion, pyrolysis, composting and landfilling have been employed for treating such wastes. However, it requires integrated system that could utilize waste and promote circular bioeconomy. This review explores integration of anaerobic digestion and pyrolysis for treating agricultural and food waste. Proposed system examines the production of biochar and pyro-oil by pyrolysis of digestate. The use of this biochar for stabilizing anaerobic digestion process, biogas purification and soil amendment will promote the circular bioeconomy. Kinetic models and framework of techno-economic analysis of system were discussed and knowledge gaps have been identified for future research. This system will provide sustainable approach and offer carbon capture and storage in form of biochar in soil. [ABSTRACT FROM AUTHOR]

Food waste has been become the major concern due to changing the lifestyle and urbanization which needs proper management. Thus, a basic computational investigation of anaerobic digestion is proposed to forecast the quantity of biogas generated from food waste owing to potential of food waste as an energy resource. Numerous models are available, though the majority depend on algebraic equations rather than biochemical equations and necessitate several input parameters alongside computational duration. This study predicts the biomethane potential of food waste having nine different categories. This research presents a streamlined model that forecasts the quantity of produced biogas from food waste energy viability investigations, such as sizing bioreactors that may help to process organic waste. The approach is applicable to alternative raw materials and can be replicated for comparable use cases, aiming to broaden the implementation of anaerobic digestion systems as an environmentally friendly energy resource. The estimation of biogas has been examined by employing theoretical equations and experimental techniques. Further, cumulative biogas yield was measured for all samples in which cooked vegetables provided higher energy production potential, whereas fruit pulp exhibits the lowest energy production potential followed by 426 ml/gmVS, and 207 ml/gmVS respectively. From biogas compositional analysis, the highest quality biomethane was observed in fruit pulp whereas the lowest quality methane was observed in vegetable waste which is 59% and 44% respectively. It can be analysed that this model will help to promote the food waste management and a platform for buyers and energy producers' industries. • Food waste a major concern due to changing lifestyle and urbanization. • Tool development to estimate the biomethane potential of different type of food waste. • Algebraic equations rather than biochemical equations. • Streamlined model that forecasts the quantity of produced biogas from food waste. • Developed tool will help to promote the food waste management effectively. [ABSTRACT FROM AUTHOR]