METHANE POTENTIAL OF FOOD WASTE AND ANAEROBIC TOXICITY OF LEACHATE PRODUCED DURING FOOD WASTE DECOMPOSITION |
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| Institution: | 1. Department of Civil Engineering, North Carolina State University, Raleigh, Box 7908, 27695-7908, NC, U.S.A.;2. Allan & Hoshall, 2430 Poplar Ave. Memphis, 38112, TN, U.S.A.;3. Brown & Caldwell, 53 Perimeter Center E, Suite 500, Atlanta, 30346, GA, U.S.A.;4. Department of Civil Engineering, North Carolina State University, Raleigh, Box 7908, 27695-7908, NC, U.S.A.;1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Yuhangtang Road 866#, Hangzhou 310058, China;2. School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, 2nd Street 928#, Hangzhou 310018, China;3. College of Environmental Science and Engineering, Tongji University, Siping Road 1239#, Shanghai 200092, China;1. Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, PR China;2. Shanghai Key Laboratory for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, PR China;3. Engineering Research Center for Nanophotonics and Advanced Instrument, Ministry of Education, East China Normal University, Shanghai 200062, PR China;4. Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China;1. School of Life Sciences, Nanjing University, Nanjing, Jiangsu 210023, China;2. Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, Jiangsu, China;1. Department of Chemical Engineering, College of Engineering, Qatar University, P O Box 2713 Doha, Qatar;2. Center of Biomedical Engineering, Institute of Molecular Medicine, Sechenov University, Moscow 119991, Russia;3. Department of Polymer Science and Engineering, Department of IT and Energy Convergence (BK21 FOUR), Chemical Industry Institute, Korea National University of Transportation, Chungju-si, 27469, Republic of Korea;4. Department of Civil and Architectural Engineering, College of Engineering, Qatar University, P O Box 2713 Doha, Qatar;1. Departamento de Construção Civil, Centro de Tecnologia e Urbanismo, Universidade Estadual de Londrina - UEL, Rodovia Celso Garcia Cid, PR445, Km380, 86057970, Londrina, Paraná, Brazil;2. Departamento de Estatística, Centro de Ciências Exatas, Universidade Estadual de Londrina - UEL, Rodovia Celso Garcia Cid, PR445, Km380, 86057970, Londrina, Paraná, Brazil;1. Centro de Tecnologia, Av. Horácio Macedo, 2030, 101 Cidade Universitária, Rio de Janeiro, RJ, 21941-450, Brazil;2. Institut for Kemi-, Bio- og Miljøteknologi, Niels Bohrs Allé 1, Odense, DK 5230, Denmark;3. Water and Environmental Engineering, Chemical Engineering, Box 124, Lund, SE 221 00, Sweden |
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| Abstract: | The objective of this study was to characterize the anaerobic biodegradation of food waste, including its methane potential and the anaerobic toxicity of leachate associated with food waste decomposition. Biodegradation experiments were conducted in 2.2-litre reactors and were seeded with well-decomposed refuse. Despite pH neutralization, reactors seeded with 30% old refuse failed to undergo methanogenesis. Food waste in a second set of reactors, containing 70% seed, produced 300.7 ml CH4dry g−1. Leachate toxicity was evaluated by a modified anaerobic toxicity assay (ATA). The results of ATAs were typically consistent with the methane production behavior of the reactors. However, the toxicity observed in the ATA test could not be simulated with synthetic leachate containing high concentrations of carboxylic acids and sodium. Tests with 20, 5, 15 and 12 g l−1of acetate, propionate, butyrate and sodium, respectively, suggested that high concentrations of butyric acid and sodium inhibited the onset of methane production but that refuse micro-organisms could acclimatize to these concentrations within 5–10 days. The refuse ecosystem was shown to tolerate higher concentrations of undissociated carboxylic acids than previously reported for anaerobic digesters. |
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