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- Anacleto, Thuane Mendes, et al.
(författare)
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Methane yield response to pretreatment is dependent on substrate chemical composition: a meta-analysis on anaerobic digestion systems
- 2024
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Ingår i: Scientific Reports. - : NATURE PORTFOLIO. - 2045-2322. ; 14:1
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Tidskriftsartikel (refereegranskat)abstract
- Proper pretreatment of organic residues prior to anaerobic digestion (AD) can maximize global biogas production from varying sources without increasing the amount of digestate, contributing to global decarbonization goals. However, the efficiency of pretreatments applied on varying organic streams is poorly assessed. Thus, we performed a meta-analysis on AD studies to evaluate the efficiencies of pretreatments with respect to biogas production measured as methane yield. Based on 1374 observations our analysis shows that pretreatment efficiency is dependent on substrate chemical dominance. Grouping substrates by chemical composition e.g., lignocellulosic-, protein- and lipid-rich dominance helps to highlight the appropriate choice of pretreatment that supports maximum substrate degradation and more efficient conversion to biogas. Methane yield can undergo an impactful increase compared to untreated controls if proper pretreatment of substrates of a given chemical dominance is applied. Non-significant or even adverse effects on AD are, however, observed when the substrate chemical dominance is disregarded.
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| 5. |
- Björn (Fredriksson), Annika, 1972-, et al.
(författare)
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Feasibility of OFMSW co-digestion with sewage sludge for increasing biogas production at wastewater treatment plants
- 2017
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Ingår i: Euro-Mediterranean Journal for Environmental Integration. - : Springer. - 2365-6433 .- 2365-7448. ; 2:21
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Tidskriftsartikel (refereegranskat)abstract
- Sweden has the ambition to increase its annual biogas production from the current level of 1.9 to 15 TWh by 2030. The unused capacity of existing anaerobic digesters at wastewater treatment plants is among the options to accomplish this goal. This study investigated the feasibility of utilizing the organic fraction of municipal solid waste (OFMSW) as a co-substrate, with primary and waste-activated sewage sludge (PWASS) for production of biogas, corresponding to 3:1 ratio on volatile solid (VS) basis. The results demonstrated that co-digestion of OFMSW with PWASS at an organic loading rate of 5 gVS l−1 day−1 has the potential to increase the biogas production approximately four times. The daily biogas production increased from 1.0 ± 0.1 to 3.8 ± 0.3 l biogasl−1 day−1, corresponding to a specific methane production of 420 ± 30 Nml methane gVS−1 during the laboratory experiment. Co-digestion of OFMSW with PWASS showed a 50:50 distribution of hydrogenotrophic and aceticlastic methanogens in the digester and enhanced the turnover kinetics of intermediate products (acetate, propionate, and oleate). Practical limitations potentially include the need for sludge dewatering to maintain a sufficient hydraulic retention time (17 days in this study), as well as additional energy consumption for mixing due to an increased sludge apparent viscosity (from 1.8 ± 0.1 to 45 ± 4.8 mPa*s in this study) at elevated OFMSW-loading rates.
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- Björn (Fredriksson), Annika, et al.
(författare)
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Impacts of Temperature on the Leaching of Organotin Compounds From Poly(vinyl chloride) Plastics : A Study Conducted Under Simulated Landfill Conditions
- 2007
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Ingår i: Journal of Vinyl and Additive Technology. - : Wiley. - 1083-5601 .- 1548-0585 .- 0193-7197 .- 1548-0577. ; 13:4, s. 176-188
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Tidskriftsartikel (refereegranskat)abstract
- The aim of the study was to investigate whether organotin-stabilized poly(vinyl chloride) (PVC) products could contribute to the pool of organotins observed in landfill leachates, and if the possible release could be related to different temperatures and landfill degradation phases. Small-scale anaerobic reactors filled with generic household waste, a mixture of inocula, and different PVC plastics were used in the study and incubated at 20, 37, 55, and 70°C. The reactor units incubated at temperatures of 20-55°C underwent the anaerobic degradation phases that are characteristic for the aging of landfilled waste material. There were, however, differences in the duration of the phases as well as in the total biogas production among the units. Under methanogenic conditions greater losses of organotin compounds were observed as compared to acidogenic conditions. It was shown that the release of organotin stabilizers increases considerably at temperatures above the glass transition of the PVC products. A dealkylation from di- into monoalkyltin species was observed, as well as a possible methylation of inorganic tin. However, the main part of the organotins was adsorbed into the solid waste matrix.
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| 7. |
- Björn (Fredriksson), Annika, 1972-, et al.
(författare)
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Interimreport 1 for the project on natural formation, degradation and occurrence of methyltins in different habitats. : Common project between Rohm and Haas, former Morton Plastics Additive (MPA), Cincinnati, Ohio, USA and the Department of Water and Environmental Studies (DWES), Linköping Univeristy, Sweden
- 1998
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Rapport (övrigt vetenskapligt/konstnärligt)
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| 8. |
- Björn (Fredriksson), Annika, 1972-, et al.
(författare)
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Interimreport 2 for the project on natural formation, degradation and occurrence of methyltins in different habitats. : Common project betweenRohm and Haas, former Morton Plastics Additive (MPA), Cincinnati, Ohio, USA and the Department of Water and Environmental Studies (DWES), Linköping Univeristy, Sweden.
- 2000
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Rapport (övrigt vetenskapligt/konstnärligt)
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