33 results on '"Praspaliauskas, Marius"'
Search Results
2. Biomass gasification to syngas in thermal water vapor arc discharge plasma
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Tamošiūnas, Andrius, Gimžauskaitė, Dovilė, Aikas, Mindaugas, Uscila, Rolandas, Snapkauskienė, Vilma, Zakarauskas, Kęstutis, and Praspaliauskas, Marius
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- 2023
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3. Catalytic pyrolysis and kinetic study of glass fibre-reinforced epoxy resin over CNTs, graphene and carbon black particles/ZSM-5 zeolite hybrid catalysts
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Yousef, Samy, Eimontas, Justas, Striūgas, Nerijus, Praspaliauskas, Marius, and Abdelnaby, Mohammed Ali
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- 2023
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4. Evaluation of phytoremediation efficiency of shooting range soil using the bioaccumulation potential and sensitivity of different plant species
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Mankė, Jūratė, Praspaliauskas, Marius, Pedišius, Nerijus, and Sujetovienė, Gintarė
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- 2024
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5. Comparison of the influence of additives on the melting behaviour of wheat straw and fibre hemp ash
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Čepauskienė, Deimantė, Vaškevičienė, Irena, Praspaliauskas, Marius, and Pedišius, Nerijus
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- 2022
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6. Oilseed rape (Brassica napus L.) potential to remediate Cd contaminated soil under different soil water content
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Kniuipytė, Inesa, Dikšaitytė, Austra, Praspaliauskas, Marius, Pedišius, Nerijus, and Žaltauskaitė, Jūratė
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- 2023
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7. Earthworm Eisenia fetida potential for sewage sludge amended soil valorization by heavy metal remediation and soil quality improvement
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Žaltauskaitė, Jūratė, Kniuipytė, Inesa, and Praspaliauskas, Marius
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- 2022
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8. Biological assessment of contaminated shooting range soil using earthworm biomarkers
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Česynaitė, Jūratė, Praspaliauskas, Marius, Pedišius, Nerijus, and Sujetovienė, Gintarė
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- 2021
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9. Performance of Corn Cob Combustion in a Low-Temperature Fluidized Bed.
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Paulauskas, Rolandas, Praspaliauskas, Marius, Ambrazevičius, Ignas, Zakarauskas, Kęstutis, Lemanas, Egidijus, Eimontas, Justas, and Striūgas, Nerijus
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CORNCOBS , *COMBUSTION , *BIOMASS burning , *PARTICULATE matter , *LOW temperatures - Abstract
This study investigates the combustion of agricultural biomass rich in alkali elements in the fluidized bed. The experiments were performed with smashed corn cob in a 500 kW fluidized bed combustor which was designed for work under low bed temperatures (650–700 °C). During the experiments, the formed compounds from corn cob combustion were measured by sampling particulate matter, and mineral compositions were determined. Also, the temperature profile of the FBC was established. It was determined that the emissions of K and Na elements from the FBC increased from 4 to 7.3% and from 1.69 to 3%, respectively, changing the bed temperature from 650 to 700 °C. Though alkali emissions are reduced at a 650 °C bed temperature, CO emissions are higher by about 50% compared to the case of 700 °C. The addition of 3% of dolomite reduced the pollutant emissions and alkali emissions as well. Potassium content decreased by about 1% and 4%, respectively, at the bed temperatures of 650 °C and 700 °C. The NOx emissions were less than 300 mg/m3 and did not exceed the limit for medium plants regarding DIRECTIVE (EU) 2015/2193. During extended experiments lasting 8 h, no agglomeration of the fluidized bed was observed. Moreover, the proposed configuration of the FBC and its operational parameters prove suitable for facilitating the efficient combustion of agricultural biomass. [ABSTRACT FROM AUTHOR]
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- 2024
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10. Pyrolysis kinetic behavior and TG-FTIR-GC–MS analysis of metallised food packaging plastics
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Yousef, Samy, Eimontas, Justas, Striūgas, Nerijus, Zakarauskas, Kęstutis, Praspaliauskas, Marius, and Abdelnaby, Mohammed Ali
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- 2020
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11. Olive mill wastewater: From a pollutant to green fuels, agricultural water source and bio-fertilizer. Biofuel production
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Jeguirim, Mejdi, Goddard, Mary-Lorène, Tamosiunas, Andrius, Berrich-Betouche, Emna, Azzaz, Ahmed Amine, Praspaliauskas, Marius, and Jellali, Salah
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- 2020
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12. An In-Depth Analysis of Physical, Chemical, and Microplastic Parameters of Landfill Fine Fraction for Biocover Construction.
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Sholokhova, Anastasiia, Pitak, Inna, Denafas, Gintaras, Kalpokaitė-Dičkuvienė, Regina, Praspaliauskas, Marius, and Burlakovs, Juris
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Landfills pose global challenges, notably in terms of greenhouse gas (GHG) emissions, pollution release, and extensive land occupation. The transformative practice of landfill mining has redefined these sites as valuable resource reservoirs. The fine fraction (FF), often constituting the majority of excavated waste, is currently underutilized but holds the potential for biocover construction to mitigate methane emissions. This study comprehensively analyzes the FF from the Kuršenai landfill, collecting samples from various depths, reaching up to 10.5 m. The most suitable layers for biocover construction were determined based on basic physical and chemical parameters, along with the concentration of heavy metals and microplastics. The findings unveil significant parameter variations across different depths. Moderate–high correlations (ranging from 0.5 to 0.84) between several parameters were observed. The layer at a depth of 4.5–6 m emerged as the most suitable for biocover construction. However, this layer is characterized by elevated microplastic concentrations (30,208 ± 273 particles/kg), posing a challenge for its use in biocovers as microplastics can be released into the environment during FF extraction and biocover construction. Additionally, microplastics become finer with depth, increasing the associated risks. Therefore, a balanced approach considering material properties and pollution concentrations is vital for sustainable waste management practices. [ABSTRACT FROM AUTHOR]
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- 2023
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13. Accumulation of heavy metals in stemwood of forest tree plantations fertilized with different sewage sludge doses
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Praspaliauskas, Marius, Pedisius, Nerijus, and Gradeckas, Audrius
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- 2018
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14. Soil Remediation after Sewage Sludge or Sewage Sludge Char Application with Industrial Hemp and Its Potential for Bioenergy Production.
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Kniuipytė, Inesa, Praspaliauskas, Marius, Venclovienė, Jonė, and Žaltauskaitė, Jūratė
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Sewage sludge reuse in agriculture is increasing and is highly encouraged; however, it may pose environmental risk. Therefore, an integrated approach combining soil phytoremediation and further plant usage for bioenergy production is needed. In this study, we have examined the potential of industrial hemp (Canabis sativa L.) to remediate sewage sludge (SS) and sewage sludge char (SSCh)-amended soil (25–200 Mg ha
−1 ) and improve soil quality. Additionally, hemp's biomass and probable bioenergy yield was calculated for biomass and methane production. Heavy metal soil content increased with SS and SSCh dose, though hemp cultivation significantly reduced their soil concentrations. The heavy metals' removal efficiency could be ranked Zn > Cu > Cr > Ni. There was an enrichment of micro- (Ca, Mg, Mn, S) and macro-nutrients (P) in SS and SSCh-amended soils. P and S removal by hemp was highly efficient, whereas other macronutrients did not show a substantial decrease in the soil. Only marginal removal was detected for Ba, Fe, Na, Ti and Al. The study showed that the optimal fertilization with SS or SSCh could be up to 25 Mg ha−1 , when the highest efficiency of contaminant removal from the soil and the highest plant biomass production and bioenergy production were observed. [ABSTRACT FROM AUTHOR]- Published
- 2023
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15. Proposal for Implementation of Extraction Mechanism of Raw Materials during Landfill Mining and Its Application in Alternative Fuel Production.
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Pitak, Inna, Denafas, Gintaras, Baltušnikas, Arūnas, Praspaliauskas, Marius, and Lukošiūtė, Stasė-Irena
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New approaches to waste management and the demands of the circular economy have changed the management of landfills. Over time, the decomposition of buried waste primarily determines the amount of recyclable and combustible materials. This pilot study attempted to assess the feasibility of extracting and recovering energy-intensive raw materials from landfills by developing a waste extraction mechanism and creating a solid recovered fuel (SRF) production line for use as a replacement fuel in the cement industry. The proposed mechanism consisted of two stages. The first stage was recommended to be carried out on the landfill territory by screening out the fine fraction and extracting inert materials and bulky waste. The second stage should be on the mechanical biological treatment (MBT) plant's territory by adding additional technological equipment to the MBT line. The productivity of the SRF production line was calculated and was 4.9 t/h. The mechanism proposed in the work was tested at the operating test site in Lithuania. The composition of Landfill Mined Residues (LMRs) was studied, and the energy potential of the studied part of the landfill was calculated, which was 196,700 GJ. It has been found that the SRF produced complies with the European Union (EU) standard and, according to its classification characteristics, belongs to class III and can be used as a replacement fuel in the clinker firing process. An environmental and economic efficiency assessment was conducted using SRF in the cement kiln. The calculation result showed that using 10% SRF as a replacement fuel for coal used in clinker firing at 2.51 t/h would save 1274 USD/h in coal costs. This use of SRF will emit 3.64 t/h CO
2 and achieve a net savings of 1355 USD/h. The mechanism proposed in this work aimed at reducing waste in landfills by converting materials into energy resources will help achieve the circular economy's goals. [ABSTRACT FROM AUTHOR]- Published
- 2023
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16. Evaluation of the Processing of Multi-Crop Plants into Pelletized Biofuel and Its Use for Energy Conversion.
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Petlickaitė, Rita, Jasinskas, Algirdas, Domeika, Rolandas, Pedišius, Nerijus, Lemanas, Egidijus, Praspaliauskas, Marius, and Kukharets, Savelii
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ENERGY consumption ,ENERGY conversion ,FAVA bean ,BIOMASS energy ,PLANT biomass ,WOOD pellets - Abstract
Multi-crop plants (fibrous hemp, maize, and faba bean) can potentially be an alternative to wood biomass pellets, but there is no detailed knowledge to support the suitability of this biomass for solid biofuel production. The aim of this study is to analyze and justify the suitability of multi-crop plant biomass for the production of biofuel pellets and to assess the environmental impact of burning them. This paper presents studies of physical-mechanical, thermal, and chemical characteristics of biofuel pellets from multi-crop plants and emissions during their combustion under laboratory conditions. The main parameters of the produced pellets were determined according to international standards, which are detailed in the methodology part. The length of the produced pellets ranged from 17.6 to 26.6 mm, and the diameter was about 6 mm. The density of wet pellets varied from 1077.67 to 1249.78 kg m
−3 . The amount of ash in the pellets varied from 5.75% to 8.02%. Determined lower calorific value of all pellets was close to 17.1 MJ kg−1 . The lowest CO and Cx Hy emissions were determined when burning MIX2-1 pellets (biomass of the binary crop); their values were 572 and 29 ppm, respectively. The lowest content of CO2 was determined when burning S-Mz pellets (mono crop biomass), and it was 3.5%. The lowest NOx emissions were also determined when burning the pellets of this sample, with a value of 124 ppm. Research results show that multi-crop plants are a suitable raw material for the production of solid biofuel, the burning of which does not cause negative consequences for the environment. [ABSTRACT FROM AUTHOR]- Published
- 2023
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17. Phenol and benzoic acid recovery from end-of-life of polysulfone ultrafiltration membranes and its thermochemical kinetic behaviour.
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Yousef, Samy, Eimontas, Justas, Striūgas, Nerijus, Mohamed, Alaa, Praspaliauskas, Marius, and Abdelnaby, Mohammed Ali
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BENZOIC acid ,GAS chromatography/Mass spectrometry (GC-MS) ,PHENOL ,ULTRAFILTRATION ,CHEMICAL energy - Abstract
The remarkable properties of polysulfone (PSF) membranes have contributed to their use in many ultrafiltration applications. Meanwhile, this huge usage of PSF films and its short service life have generated a huge amount of waste PSF films that need to be managed carefully. Within this framework, this is the first research specifically developed to valorize the end-of-life of PSF membranes and convert them into high-value chemical and energy products using pyrolysis treatment. The treatment was performed using a thermogravimetric analyzer (TGA), while the structure and abundance of the phenol and benzoic acid compounds in the generated vapor were determined using Fourier-transform infrared (FTIR) spectroscopy and Gas chromatography-mass spectrometry (GC-MS). Thermogravimetric recorded data at different conditions (5–30°C/min) was subjected to linear and nonlinear models including KAS, FWO, Friedman, Vyazovkin, and Cai to assess the pyrolytic kinetic behavior of PSF films. The films showed higher content of volatile matter (57%), lower NOx emissions (0.321%), and a little bit more SO
X emission (6.909%). The GC-MS showed that the pyrolytic gaseous products are rich in phenol (24.3%) and benzoic acid (52.4%) compounds and the highest abundance was achieved at 30°C/min. Whereas activation energies were estimated in the range of 193–240 kJ/mol based on linear kinetic criteria versus 161–163 kJ/mol in the case of nonlinear models, where R2 values (>0.91) indicated perfection. Also, distributed activation energy and independent parallel reaction kinetic models showed a good fit with the TGA-DTG experimental data with the minimum deviation. The study confirmed the potential of pyrolysis treatment in converting wasted PSF films into a new source for the recovery of phenolic and benzoic acid. [ABSTRACT FROM AUTHOR]- Published
- 2023
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18. Bioaccumulation of trace metal(loid)s and toxic response of Lactuca sativa grown in shooting range soil.
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Česynaitė, Jūratė, Praspaliauskas, Marius, and Sujetovienė, Gintarė
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LETTUCE , *RIFLE-ranges , *BIOACCUMULATION , *SOIL pollution , *SOILS - Abstract
Contamination of shooting range soil with trace metal(loid)s, especially Pb, is an important issue due to its potential environmental hazards. The aim of the study was to evaluate the bioavailability and toxicity of Sb, Fe, and Ni to lettuce (Lactuca sativa L.) grown in highly contaminated soil (Pb 0.4—55 g kg−1, Sb < 0.5 g kg−1) of a civilian shooting range. Lettuce growth was negatively affected, especially of plants grown in the most highly contaminated soil, which was near the target lines, where roots accumulated Pb up to 40 g kg−1 (max 56 g kg−1), 10 times higher than in the shoots. Sb, Fe, and Ni were also accumulated in the roots, but their translocation to the shoots was low. [ABSTRACT FROM AUTHOR]
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- 2023
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19. Subsequent drought and re‐watering events cause a shift in productivity and nutritive value of alfalfa and hybrid fescue plant.
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Kacienė, Giedrė, Miškelytėc, Diana, Dikšaitytė, Austra, Januškaitienė, Irena, Sujetovienė, Gintarė, Žaltauskaitė, Jūratė, Praspaliauskas, Marius, and Juknys, Romualdas
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DROUGHTS ,ALFALFA ,FESCUE ,FORAGE plant quality ,WATER shortages ,CLIMATE change ,PLANT metabolism - Abstract
Global climate change leads to increasing frequency of droughts, threatening the productivity and quality of forage plants. Therefore, this glasshouse experiment was conducted to investigate the effects of reoccurring droughts on productivity and nutritive value of alfalfa and hybrid fescue plants. Starting from 63 days after sowing, seedlings of plants were exposed to double drought‐recovery treatments, each separate period lasting for 1 week. At the end of each treatment, growth of above‐ and below‐ground dry weight, lipid peroxidation, total antioxidative capacity, content of polyphenols, soluble and insoluble carbohydrates and proteins, as well as elemental composition of shoots were investigated. The findings confirmed our hypothesis, as growth of both plant species were mostly insignificantly affected by subsequent drought events. Whereas effect on leave redox homeostasis and plant nutritive value was much stronger, highly depending on both plant species and the order of stress event. We found significant drought‐induced increase in the content of water‐soluble carbohydrates (WSCs), starch, soluble and insoluble proteins, and polyphenols. Water shortage tended to decrease and increase the content of most macro‐ and microelements in alfalfa and fescue, respectively. These effects were reversed by re‐watering with several exceptions, such as constant reduction of Ca content in alfalfa. To conclude, alfalfa was found to be more sensitive than fescue to the first drought, but able to recover after both stress events. The second drought‐initiated prolonged accumulation of WSC implies a shift in plants metabolism towards increased resistance and herewith nutritive value with respect to soluble sugars. [ABSTRACT FROM AUTHOR]
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- 2023
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20. Olive mill wastewater: From a pollutant to green fuels, agricultural water source and bio-fertilizer. Biofuel production
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Berrich, Emna, Jeguirim, Mejdi, Goddard, Mary-Lorène, Tamosiunas, Andrius, Berrich-Betouche, Emna, Azzaz, Ahmed Amine, Praspaliauskas, Marius, Jellali, Salah, Département Systèmes Energétiques et Environnement (IMT Atlantique - DSEE), IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Valorisation Energie-matière des Résidus et Traitement des Emissions (GEPEA-VERTE), Laboratoire de génie des procédés - environnement - agroalimentaire (GEPEA), Ecole Nationale Vétérinaire, Agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS)-Université Bretagne Loire (UBL)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Vétérinaire, Agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS)-Université Bretagne Loire (UBL)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS), Institut de Science des Matériaux de Mulhouse (IS2M), Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Matériaux et nanosciences d'Alsace, Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Strasbourg (UNISTRA)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Université de Strasbourg (UNISTRA), Laboratoire Vigne Biotechnologie et Environnement (LVBE), Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA)), Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Centre National de la Recherche Scientifique (CNRS), Centre de Recherche et Technologies des Eaux (CERTE), Agence Nationale de la Recherche, FERTICHAR project, HAO-DEMETER, MHESRT, ARIMNet2, 618127, European Union’s Seventh Framework Programme for research, technological development and demonstration, Institut Universitaire de Technologie - Nantes (IUT Nantes), Université de Nantes (UN)-Université de Nantes (UN)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Institut Universitaire de Technologie Saint-Nazaire (IUT Saint-Nazaire), Université de Nantes (UN)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Ecole Nationale Vétérinaire, Agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS)-Centre National de la Recherche Scientifique (CNRS)-Université Bretagne Loire (UBL)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut Universitaire de Technologie - La Roche-sur-Yon (IUT La Roche-sur-Yon), Université de Nantes (UN)-Institut Universitaire de Technologie - Nantes (IUT Nantes), Université de Nantes (UN), Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN)-Institut Universitaire de Technologie - Nantes (IUT Nantes), Université de Nantes (UN)-Institut Universitaire de Technologie Saint-Nazaire (IUT Saint-Nazaire), Université de Nantes (UN)-Institut Universitaire de Technologie - La Roche-sur-Yon (IUT La Roche-sur-Yon), Université de Nantes (UN)-Ecole Nationale Vétérinaire, Agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS)-Université Bretagne Loire (UBL)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Ecole Nationale Vétérinaire, Agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS)-Université Bretagne Loire (UBL), Centre National de la Recherche Scientifique (CNRS)-Matériaux et nanosciences d'Alsace (FMNGE), and Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique
- Subjects
Pollutant ,060102 archaeology ,Renewable Energy, Sustainability and the Environment ,020209 energy ,Pomace ,06 humanities and the arts ,02 engineering and technology ,Pulp and paper industry ,7. Clean energy ,Environmentally friendly ,6. Clean water ,12. Responsible consumption ,[CHIM.GENI]Chemical Sciences/Chemical engineering ,Wastewater ,13. Climate action ,Biofuel ,0202 electrical engineering, electronic engineering, information engineering ,Flash point ,Farm water ,Environmental science ,0601 history and archaeology ,[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering ,Pyrolysis ,ComputingMilieux_MISCELLANEOUS - Abstract
Olive mill wastewater (OMWW) management is recognized as the major defy that olive oil industry is facing. Recently, we have established an eco-friendly strategy for the OMWW conversion into irrigation water sources, green biofuels and biofertilizers. This work is a part of a series of papers detailing the different steps established in this environmental friendly strategy for OMWW management. It deals with the bio-oil production and characterization during the pyrolysis of OMWW impregnated on olive pomace (OP) in a pyrolyzer pilot. Results show a bio-oil production yield of 36 wt% during the pyrolysis test. This yield could be attributed to the recovery of organic compounds from OMWW through OP impregnation and their conversion to bio-oil. The bio-oil properties show that viscosity and flash point values could reach the European standards. However, the lower heating values (26 MJ/kg) and the acidic character limit its direct use. These values are attributed to the higher water and oxygen contents. The GC/MS analysis confirms these properties showing the presence of phenolic molecules and long chain organic acids. Therefore, OMWW impregnation on OP and pyrolysis could be considered as a promising issue for bio-oil production. However, this bio-oil requires an upgrading step for a better valorization.
- Published
- 2020
21. A manifold response of forage rape to combined heat wave and drought under current and elevated CO2.
- Author
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Kacienė, Giedrė, Miškelytė, Diana, Dikšaitytė, Austra, Januškaitienė, Irena, Sujetovienė, Gintarė, Žaltauskaitė, Jūratė, Praspaliauskas, Marius, and Juknys, Romualdas
- Subjects
HEAT waves (Meteorology) ,RAPE ,DROUGHTS ,DROUGHT management ,TERMINATION of treatment ,AGRICULTURAL climatology ,FORAGE plants - Abstract
Intensity and frequency of heat waves (HW) accompanied by drought are increasing, however, still little is known about its effect on forage plants. A pot experiment was carried out in growth chambers in order to elucidate the multiple response of forage rape to combined HW and drought (HD) under current and elevated CO2 (HD + CO2). Forage rape was proved to be relatively HD‐resistant plant, with no significant and long‐term effects on shoot growth and photosynthetic performance, and effective stimulation of antioxidative system, especially in the case of HD + CO2 exposure. Activities of enzymes of ascorbate–glutathione cycle were further stimulated by elevated CO2 even after the termination of HD treatment. Nutritive value of forage rape was also positively affected, as was shown by elevated content of water‐soluble carbohydrates after exposure and starch after the period of recovery (up to 80% and 92%, respectively). Concentrations of most macro‐ and microelements were increased, and stabilized higher or equalized to control level after the period of recovery in a similar pattern for HD and HD + CO2 exposure. However, content of Ca was reduced and remained significantly lower (~20%). One of the most important negative and lagged HD effects was reduction of dry root biomass (~30%), most possibly induced by accumulation of non‐structural carbohydrates in shoot and was not mitigated by elevated CO2. To conclude, forage rape was proved to be a promising forage crop for the future climate with increased frequency of HWs; however, a special attention should be paid to the lagged effects, such as inhibition of root growth. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
22. Investigation of sewage sludge pyrolysis products and residual solid material influence to fibre hemp biomass production
- Author
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Praspaliauskas, Marius and Striūgas, Nerijus
- Subjects
fibre hemp ,pluoštinė kanapė ,sewage sludge ,pirolizė ,elemental composition ,nuotekų dumblas ,elementinė sudėtis ,pyrolysis ,accumulation factor ,kaupimosi faktorius - Abstract
The quantities of sewage sludge generated in the treatment plants already pose serious problems related to its storage and use. The Article 14 of the Urban Waste Water Treatment Directive 91/271/EEC specifies, “Sewage sludge from waste water treatment shall be re-used whenever appropriate. Disposal routes shall minimize the adverse effects on the environment “. Therefore, priority is given to the reuse of sewage sludge, rather than disposal it to landfills or storage plants. The analysis of scientific literature related to the quantities of sewage sludge and its chemical composition, possibilities of its use in thermal process and possibilities of residual product use in other areas as a raw material was carried out by the author of dissertation. Sewage sludge samples were collected from the major water treatment systems in Lithuania during the preparation of dissertation. After investigation of their chemical quality, author selected sewage sludge samples from a small city (Šilutė) for a more detailed research. Author designed and constructed a pyrolysis stand where he carried out thermal decomposition (pyrolysis) of sewage sludge. Solid fraction as char obtained from sewage sludge was used in experimental research on cultivation of fibre hemp (Canabis sativa L.). In order to assess the regularities of distribution of heavy metals, alkaline earth metals and alkaline metals as well as of non-metals the author carried out chemical analysis of sewage sludge, sludge pyrolysis products and gifferent parts of fibre hemp (roots, stem, leaves). According to the results author found distribution of elemental migration in the course of the application of the principle of sustainable use of sewage sludge., Vandenvalos sistemose susidarančio dumblo kiekis jau dabar kelia rimtų problemų, susijusių su jo saugojimu ir panaudojimu. Miesto nuotekų valymo direktyvos 91/271/EEB 14 straipsnyje nurodoma, kad „dumblas, susidaręs valant nutekamuosius vandenis, jei tik įmanoma, turi būti panaudojamas. Jo šalinimo būdai privalo iki minimumo sumažinti aplinkai daromą neigiamą poveikį“. Todėl pirmumas teikiamas nuotekų dumblo antriniam panaudojimui, o ne išvežimui į sąvartynus ar saugojimo aikšteles. Mokslinių tyrimų rezultatai rodo, kad pirolizė yra pagrindinė alternatyva nuotekų dumblo antriniam panaudojimui. Autorius atliko mokslinės literatūros analizę, susijusią su susidarančiais nuotekų dumblo kiekiais ir jo chemine sudėtimi, dumblo panaudojimo energijos gamybai bei susidarančių produktų antrinio panaudojimo galimybėmis. Rengiant disertaciją, iš didžiausių Lietuvos vandenvalos sistemų buvo surinkti nuotekų dumblo mėginiai. Įvertinus jų kokybę pasirinkti nedidelio miesto (Šilutės) nuotekų dumblo mėginiai tolimesniems tyrimams. Autorius suprojektavo ir pagamino pirolizės stendą, kuriame buvo atliekamas nuotekų dumblo terminis (pirolizė) skaidymas. Eksperimentiniuose pluoštinių kanapių (Canabis sativa L.) auginimo tyrimuose autorius panaudojo nuotekų dumblo anglį gautą po pirolizės proceso. Siekiant įvertinti sunkiųjų metalų, šarminių metalų ir šarminių žemių metalų bei nemetalų pasiskirstymą, autorius atliko cheminę nuotekų dumblo, dumblo pirolizės produktų, atskirų pluoštinės kanapės dalių (šaknų, stiebo, lapų) analizę. Pagal gautus eksperimento rezultatus buvo nustatyti elementų pasiskirstymo dėsningumai vykdant darnaus nuotekų dumblo panaudojimo principą.
- Published
- 2019
23. Soil Contamination and Ecological Risk Assessment of Different Types of Lithuanian Shooting Ranges.
- Author
-
Mankė, Jūratė, Daukšytė, Auksė, Praspaliauskas, Marius, Pedišius, Nerijus, and Sujetovienė, Gintarė
- Abstract
Contamination at shooting ranges is a growing concern due to the accumulation of potentially toxic elements in the soil. The aim of the study was to determine the level of soil contamination in different types of Lithuanian shooting ranges (clay-target, practical, small-bore) and assess the potential ecological risks. Soil samples were taken in two soil layer depths (0–10 cm and 10–30 cm) and locations (range floor and berm/target line) of different types of shooting ranges. The soils of the practical and small-bore shooting ranges were neutral, clay target – slightly alkaline. The soil of the clay-target firing range floor had a significantly lower organic matter, than small-bore and practical firing ranges. Lead contamination was significantly higher in the floor and berm surface soil and subsoil (about 1000 mg kg−1 and 360–527 mg kg−1, respectively) of the practice range compared to the others and controls. The Cd concentrations in the surface soil of the practical range and the small-bore firing ranges and in the soil of the berm were considerably higher than in the soil of the clay target. There was a significant negative correlation between soil pH and Pb and Cd concentrations. Pb content was positively correlated with organic matter content. The soils of the practical range floor and berm indicated high ecological risk. The research showed that heavy metal contamination is specific in different types of shooting ranges, therefore various management practices should be applied to prevent pollution in particular shooting range. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
24. IMPACT OF ASH OBTAINED AFTER MULTI-CROP PELLET BURNING ON SPRING BARLEY FERTILIZATION.
- Author
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Jasinskas, Algirdas, Petlickaite, Rita, Praspaliauskas, Marius, Romaneckas, Kestutis, and Sinkeviciene, Ausra
- Subjects
- *
BARLEY varieties , *PLANT biomass , *AGRICULTURAL technology , *DRY matter content of plants , *ROOT development - Abstract
The EU Green Deal envisages a significant reduction in the use of industrial mineral fertilizers in agrotechnologies. The use of ash from another fuel made from plant biomass could help not only to utilize combustion residues, but also to optimize the nutrition of cultivated agricultural plants without harming the environment. With this aim, a pot experiment of the effects of multi-crops biomass ash on spring barley sprouts was carried out in January-February 2024 in the greenhouse of the Academy of Agriculture of the Vytautas Magnus University (VMU). Four ash fertilization rates were tested: 1. Unfertilized (N0, comparative-control treatment); 2. Fertilized at a low rate (N1); 3. Fertilized at an average rate (N2); 4. Fertilized at a high rate (N3). Or 200, 1000 and 2000 kg·ha-2, respectively. According to the results of investigations, the average rate of ash fertilization (N2) was the most effective for spring barley sprout growth. The shoot length was about 6 cm higher than in control. Ash fertilization rates had no significant effect on the root development. Fertilization with ash initiated the rise of the concentration of chlorophyll in spring barley leaves significantly by up to 46%. Fertilization with ash usually reduced the amount of dry matter in barley shoots but increased it in their roots. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
25. Elemental Migration and Transformation from Sewage Sludge to Residual Products during the Pyrolysis Process.
- Author
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Praspaliauskas, Marius, Pedišius, Nerijus, and Striūgas, Nerijus
- Published
- 2018
- Full Text
- View/download PDF
26. Investigation of Pressed Solid Biofuel Produced from Multi-Crop Biomass.
- Author
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Petlickaitė, Rita, Jasinskas, Algirdas, Mieldažys, Ramūnas, Romaneckas, Kęstutis, Praspaliauskas, Marius, and Balandaitė, Jovita
- Abstract
The paper presents the preparation and use of pressed solid biofuel of multi-crop plants (fibrous hemp (Cannabis sativa L.), maize (Zea mays L.) and faba bean (Vicia faba L.)) as mono, binary and trinomial crops. The results of the investigation show that three main chemical elements (carbon, oxygen and hydrogen) accounted for 93.1 to 94.9% of the biomass pellet content. The moisture content varied from 3.9 to 8.8%, ash content from 4.5 to 6.8% and calorific value from 16.8 to 17.1 MJ·kg
−1 . It was found that the density (DM) of all variants of pellets was very similar; the faba bean biomass pellets had the highest density of 1195.8 kg·m−3 DM. The initial ash deformation temperature (DT) of burning biomass pellets was detected, which varied from 976 to 1322 °C. High potassium (K), calcium (Ca) and phosphorus (P) concentrations were found in all types of biomass ash. The quantities of heavy metals in pellet ash were not large and did not exceed the permissible values according to Lithuanian legislation. These chemical properties of multi-crop biomass ash allow them to be used in agriculture for plant fertilization. [ABSTRACT FROM AUTHOR]- Published
- 2022
- Full Text
- View/download PDF
27. Analysis of Wood Chip Characteristics for Energy Production in Lithuania.
- Author
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Pedišius, Nerijus, Praspaliauskas, Marius, Pedišius, Justinas, and Dzenajavičienė, Eugenija Farida
- Subjects
- *
WOOD chips , *WOOD chemistry , *MOISTURE in wood , *SLASH (Logging) , *MOISTURE measurement , *STANDARD deviations - Abstract
Wood chips and logging residues currently comprise the largest share of biomass fuels used for heat generation in district heating plants and are provided by a variety of suppliers. Ash and moisture contents, as well as the calorific value, may vary considerably depending on the composition of the fuel, seasonality, location, and other factors. This paper provides the summarized results of the main characteristics of wood chip moisture and ash content and calorific value, experimentally tested for a significant range of samples. Chip samples were collected from two district heating companies and tested for a significant range of samples. Chip samples were collected from two district heating companies and tested for a 3-year period. The data on fuel chip prices were taken from the electronic wood chip trading platform. The tests were performed using standard express methods, where two sub-samples were taken and analyzed from every chip sample. It was determined that the moisture content of the wood chips varied from 35% to 45%, the calorific value from 18.4 to 19.6 MJ/kg, and the ash content from 0.5% to 4.5%. The calculated relative expanded uncertainty of the moisture content measurement was ±2.1%, of calorific value—±1.5%, and of ash—±1.0%. The repeatability of the results was estimated as the pooled standard deviation. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
28. Pyrolysis Kinetic Behaviour of Glass Fibre-Reinforced Epoxy Resin Composites Using Linear and Nonlinear Isoconversional Methods.
- Author
-
Yousef, Samy, Eimontas, Justas, Striūgas, Nerijus, Praspaliauskas, Marius, Abdelnaby, Mohammed Ali, and Cicala, Gianluca
- Subjects
CHEMICAL decomposition ,PYROLYSIS ,INFRARED spectroscopy ,GLASS ,FUNCTIONAL groups ,EPOXY resins ,EPOXY coatings - Abstract
Due to the increasing demand for glass fibre-reinforced epoxy resin composites (GFRC), huge amounts of GFRC waste are produced annually in different sizes and shapes, which may affect its thermal and chemical decomposition using pyrolysis technology. In this context, this research aims to study the effect of mechanical pre-treatment on the pyrolysis behaviour of GFRC and its pyrolysis kinetic. The experiments were started with the fabrication of GFRC panels using the vacuum-assisted resin transfer method followed by crushing the prepared panels using ball milling, thus preparing the milled GFRC with uniform shape and size. The elemental, proximate, and morphology properties of the panels and milled GFRC were studied. The thermal and chemical decomposition of the milled GFRC was studied using thermogravimetric coupled with Fourier-transform infrared spectroscopy (TG-FTIR) at different heating rates. Meanwhile, the volatile products were examined using TG coupled with gas chromatography–mass spectrometry (GC-MS). The TG-FTIR and TG-GC-MS experiments were performed separately. Linear (Kissinger–Akahira–Sunose (KAS), Flynn–Wall–Ozawa (FWO), and Friedman) and nonlinear (Vyazovkin and Cai) isoconversional methods were used to determine the pyrolysis kinetic of the milled GFRC based on thermogravimetry and differential thermal gravimetry (TG/DTG). In addition, the TG/DTG data of the milled GFRC were fitting using the distributed activation energy model and the independent parallel reactions kinetic model. The TG results showed that GFRC can decompose in three stages, and the main decomposition is located in the range 256–500 °C. On the other hand, aromatic benzene and a C-H bond were the major functional groups in the released volatile components in FTIR spectra, while phenol (27%), phenol,4-(1-methylethyl) (40%), and p-isopropenylphenol (34%) were the major compounds in GC-MS analysis. Whereas, the kinetic results showed that both isoconversional methods can be used to determine activation energies, which were estimated 165 KJ/mol (KAS), 193 KJ/mol (FWO), 180 KJ/mol (Friedman), 177 KJ/mol (Vyazovkin), and 174 KJ/mol (Cai). [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
29. Investigation of Buckwheat Hulls as Additives in the Production of Solid Biomass Fuel from Straw.
- Author
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Kulokas, Mindaugas, Praspaliauskas, Marius, and Pedišius, Nerijus
- Subjects
- *
BUCKWHEAT , *RICE hulls , *BIOMASS production , *STRAW , *WHEAT straw , *WOOD chips , *ANALYTICAL chemistry - Abstract
The aim of this study was to further increase the amount of straw that can be used to produce solid biofuels, as currently only about 130–140 thousand of the 3 million tonnes of straw collected annually in Lithuania are used for solid biofuel production. Therefore, the use of buckwheat hulls as an additive in solid biofuel production was investigated. Mixtures of wheat straw and buckwheat hulls were used for this research, with an increase in buckwheat hulls from 25% to 75% of the total weight of the mixture. Results of the analysis of the chemical composition, moisture, ash, and volatile matter content of the mixtures, as well as their ash properties, were compared with the corresponding results obtained with pure buckwheat hulls, wheat straw, and wood chips. It is observed an increase in all ash melting temperatures by increasing the portion of buckwheat hulls in the mixture. Additionally, the ash shrinkage starting temperature was shown to increase as the total content of buckwheat hulls also increased in the mixture. This increase ranged from 90 °C to 210 °C. Furthermore, the Cl concentration in fuel mixtures and the corrosion risk of equipment are accordingly reduced by using buckwheat hulls, as an addition that does not contain Cl. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
30. Comprehensive evaluation of sewage sludge and sewage sludge char soil amendment impact on the industrial hemp growth performance and heavy metal accumulation.
- Author
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Praspaliauskas, Marius, Žaltauskaitė, Jūratė, Pedišius, Nerijus, and Striūgas, Nerijus
- Subjects
- *
SEWAGE sludge , *HEAVY metals , *CLAY loam soils , *SOIL amendments , *HEAVY metals removal (Sewage purification) , *CHAR , *ENERGY crops - Abstract
• Hemp biomass production on clay loam soil on average latitudes. • Heavy metal, alkaline earth-alkali metals and non metals distribution in hemp parts. • Bioconcentration factor impact to soil remediation of heavy metals. • Alkaline earth-alkaline metals and non metals impact to slagging process in combustion. Industrial hemp (Cannabis sativa L.) has emerged as a potential multipiurpose crop: fibre crop, energy crop, and phytoextractor of pollutants from the soil. However, the multipurpise grwoth of hemp was restricted as its cultivation in EU was legalized only in the past two decades. Most scientific researches of sewage sludge (SS) describe it at relatively low application levels for cultivation of different crops. Such lack of information requires a wide range of practices for fertilizing hemp with high level of sewage sludge or sewage sludge char (SSCh) doses. At this moment there are no guidelines for sewage sludge char fertilization of energetic plants, depending on soil type. The aim of the study was to analyze and compare SS and SSCh soil application effect on industrial hemp (Cannabis sativa L.) growth performance, and heavy metals accumulation to determine optimum SS or SSCh application rates for the growth of hemp. The experimental design consisted of four treatments: 1–25; 2–50; 3–100; 4–200 of sewage sludge and sewage sludge char Mg ha−1, and control soil (clay loam). It was determined that hemp ability to accumulate heavy metals depending on fertilisation intensity of sewage sludge and sewage sludge char decreased in all parts. Heavy metal distribution of hemp was selective; therefore their contents were decreasing in the following order: roots > stems > leaves. The study has confirmed the nutritional value of SS and SSCh. The potential of using the sewage sludge and its char as a source of organic matter for improvement of clay loam soil and a reasonable production of bioenergy crop like hemp without the use of inorganic fertilizers was shown. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
31. Gasification of Waste Cooking Oil to Syngas by Thermal Arc Plasma.
- Author
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Tamošiūnas, Andrius, Gimžauskaitė, Dovilė, Aikas, Mindaugas, Uscila, Rolandas, Praspaliauskas, Marius, and Eimontas, Justas
- Subjects
PETROLEUM waste ,PLASMA torch ,THERMAL plasmas ,SYNTHESIS gas ,BIOMASS gasification ,GEOTHERMAL resources - Abstract
The depletion and usage of fossil fuels causes environmental issues and alternative fuels and technologies are urgently required. Therefore, thermal arc water vapor plasma for a fast and robust waste/biomass treatment is an alternative to the syngas method. Waste cooking oil (WCO) can be used as an alternative potential feedstock for syngas production. The goal of this experimental study was to conduct experiments gasifying waste cooking oil to syngas. The WCO was characterized in order to examine its properties and composition in the conversion process. The WCO gasification system was quantified in terms of the produced gas concentration, the H
2 /CO ratio, the lower heating value (LHV), the carbon conversion efficiency (CCE), the energy conversion efficiency (ECE), the specific energy requirements (SER), and the tar content in the syngas. The best gasification process efficiency was obtained at the gasifying agent-to-feedstock (S/WCO) ratio of 2.33. At this ratio, the highest concentration of hydrogen and carbon monoxide, the H2 /CO ratio, the LHV, the CCE, the ECE, the SER, and the tar content were 47.9%, 22.42%, 2.14, 12.7 MJ/Nm3 , 41.3% 85.42%, 196.2 kJ/mol (or 1.8 kWh/kg), and 0.18 g/Nm3 , respectively. As a general conclusion, it can be stated that the thermal arc-plasma method used in this study can be effectively used for waste cooking oil gasification to high quality syngas with a rather low content of tars. [ABSTRACT FROM AUTHOR]- Published
- 2019
- Full Text
- View/download PDF
32. A manifold response of forage rape to combined heat wave and drought under current and elevated CO2.
- Author
-
Kacienė, Giedrė, Miškelytė, Diana, Dikšaitytė, Austra, Januškaitienė, Irena, Sujetovienė, Gintarė, Žaltauskaitė, Jūratė, Praspaliauskas, Marius, and Juknys, Romualdas
- Subjects
- *
HEAT waves (Meteorology) , *RAPE , *DROUGHTS , *DROUGHT management , *TERMINATION of treatment , *AGRICULTURAL climatology , *FORAGE plants - Abstract
Intensity and frequency of heat waves (HW) accompanied by drought are increasing, however, still little is known about its effect on forage plants. A pot experiment was carried out in growth chambers in order to elucidate the multiple response of forage rape to combined HW and drought (HD) under current and elevated CO2 (HD + CO2). Forage rape was proved to be relatively HD‐resistant plant, with no significant and long‐term effects on shoot growth and photosynthetic performance, and effective stimulation of antioxidative system, especially in the case of HD + CO2 exposure. Activities of enzymes of ascorbate–glutathione cycle were further stimulated by elevated CO2 even after the termination of HD treatment. Nutritive value of forage rape was also positively affected, as was shown by elevated content of water‐soluble carbohydrates after exposure and starch after the period of recovery (up to 80% and 92%, respectively). Concentrations of most macro‐ and microelements were increased, and stabilized higher or equalized to control level after the period of recovery in a similar pattern for HD and HD + CO2 exposure. However, content of Ca was reduced and remained significantly lower (~20%). One of the most important negative and lagged HD effects was reduction of dry root biomass (~30%), most possibly induced by accumulation of non‐structural carbohydrates in shoot and was not mitigated by elevated CO2. To conclude, forage rape was proved to be a promising forage crop for the future climate with increased frequency of HWs; however, a special attention should be paid to the lagged effects, such as inhibition of root growth. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
33. Do plants respond and recover from a combination of drought and heatwave in the same manner under adequate and deprived soil nutrient conditions?
- Author
-
Dikšaitytė, Austra, Viršilė, Akvilė, Žaltauskaitė, Jūratė, Januškaitienė, Irena, Praspaliauskas, Marius, and Pedišius, Nerijus
- Subjects
- *
DROUGHTS , *PLANT-water relationships , *PHOTOSYSTEMS , *CLIMATE extremes , *PLANT performance , *SOIL drying , *ABIOTIC stress , *HEAT waves (Meteorology) - Abstract
• Heat induces stress in growth and physiology of B. napus only under drought conditions. • Drought + heat accelerates soil drying resulting in more damage than do drought alone. • Nutrient deficiency, by itself, evoke strong stress under control conditions. • Under stress conditions, plant C/N ratio negatively correlates with plant N dynamics. • Drought + heat + nutrient deficit results in badly disturbed PSII and C/N balance. Extreme climatic conditions with extended drought periods and heatwaves are predicted to increase in frequency and severity in many regions of the world. Aside from this, other abiotic stress factors such as nutrient deficiency could pose a serious problem to plants when combined with other stressors resulting in more complex underpinning mechanisms. In the present study, we evaluated the response of Brassica napus to single and combined impacts of drought and heatwave (HW) under adequate or deprived (N-A and N-D) soil nutrient conditions. In addition, to get better insights in the plant response to combined stress, a post-stress period, pointing out a degree of the recovery after the cessation of stress, was also included. The results showed a different manner of single drought and heatwave action. The adverse effect of drought on leaf gas exchange was lagged on the growth and became more apparent only after recovery period with no obvious difference between different nutrient levels. Contrary, the growth response of nutrient-deprived plants to single HW was weak and in most cases, insignificant. Heatwave applied simultaneously with drought highly exacerbated the adverse effect of drought both under N-A and N-D conditions. Combined drought and heatwave stress resulted in the sharper decline of A sat and it was attributed to both stomatal and non-stomatal limitations. Interestingly, plants underwent combined drought and HW treatment under N-D conditions showed better aboveground growth recovery, compared to those grown under N-A conditions, while displayed far more diminished photochemistry of photosystem II and badly disturbed the C/N balance. This discrepancy came from the fact that soil nutrient deficiency, by itself, evoked strong stress under control climate conditions resulting in a dramatically slower aboveground growth of nutrient-deprived plant. In turn, although combined drought and HW stress had similar effect on the aboveground growth either under N-A or N-D conditions, the recovery of later one was better. These results highlight the necessity to look at plants' performance under unfavorable environmental conditions beyond the actual event, since it can be depended not only on the duration of exposure but also on the legacy effect after treatment. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
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