Anaerobic co-digestion of the organic fraction of municipal solid waste with FOG waste from a sewage treatment plant: Recovering a wasted methane potential and enhancing the biogas yield |
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| Authors: | L Martín-González LF Colturato X Font T Vicent |
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| Institution: | 1. Departament d’Enginyeria Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain;2. Institut de Ciència i Tecnologia Ambiental (ICTA) Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain;1. College Agriculture and Biotechnology, China Agricultural University, Beijing 100093, People’s Republic of China;2. Key Laboratory of Clean Utilization Technology for Renewable Energy in Ministry of Agriculture, College of Engineering, China Agricultural University, Beijing 100083, People’s Republic of China;1. Astani Department of Civil and Environmental Engineering, University of Southern California, 3620 South Vermont Avenue, Los Angeles, CA 90089, USA;2. Divert, Inc., 23 Bradford Street, Concord, MA 01742, USA;3. Southern California Gas Company, 555 West Fifth Street, Los Angeles, CA 90013, USA;1. Civil and Environmental Engineering, University of Washington, WA, USA;2. Scandinavian Biogas Fuels AB, Stockholm, Sweden;3. eScience Institute, University of Washington, WA, USA;4. Department of Thematic Studies – Environmental Change, Linköping University, Sweden;1. Department of Environmental Sciences, Informatics and Statistics, University Ca'' Foscari of Venice, Dorsoduro 2137, I-30123 Venice, Italy;2. Department of Biotechnology, University of Verona, Strada Le Grazie 15, I-37134 Verona, Italy;3. Interuniversity National Consortium “Chemistry for the Environment”, Via delle Industrie, 21/8-30175 Venice, Italy |
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| Abstract: | Anaerobic digestion is applied widely to treat the source collected organic fraction of municipal solid wastes (SC-OFMSW). Lipid-rich wastes are a valuable substrate for anaerobic digestion due to their high theoretical methane potential. Nevertheless, although fat, oil and grease waste from sewage treatment plants (STP-FOGW) are commonly disposed of in landfill, European legislation is aimed at encouraging more effective forms of treatment. Co-digestion of the above wastes may enhance valorisation of STP-FOGW and lead to a higher biogas yield throughout the anaerobic digestion process. In the present study, STP-FOGW was evaluated as a co-substrate in wet anaerobic digestion of SC-OFMSW under mesophilic conditions (37 °C). Batch experiments carried out at different co-digestion ratios showed an improvement in methane production related to STP-FOGW addition. A 1:7 (VS/VS) STP-FOGW:SC-OFMSW feed ratio was selected for use in performing further lab-scale studies in a 5 L continuous reactor. Biogas yield increased from 0.38 ± 0.02 L g VSfeed?1 to 0.55 ± 0.05 L g VSfeed?1 as a result of adding STP-FOGW to reactor feed. Both VS reduction values and biogas methane content were maintained and inhibition produced by long chain fatty acid (LCFA) accumulation was not observed. Recovery of a currently wasted methane potential from STP-FOGW was achieved in a co-digestion process with SC-OFMSW. |
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