Anaerobic co-digestion of fat,oil, and grease (FOG): A review of gas production and process limitations |
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| Authors: | J Hunter Long Tarek N Aziz Francis L de los Reyes Joel J Ducoste |
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| Institution: | 1. University of Portsmouth, School of Civil Engineering and Surveying, Portland Building, Portland Street, Portsmouth, Hants PO1 3AH, UK;2. University of Portsmouth, School of Biological Sciences, King Henry Building, King Henry 1st Street, Portsmouth, Hants PO1 2DY, UK;3. WRc Plc, Frankland Road, Blagrove, Swindon, Wiltshire SN5 8YF, UK;1. Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China;2. Center of Material Cycles and Waste Management Research, National Institute for Environmental Studies, Tsukuba 305-8506, Japan;3. Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan;4. Department of Frontier Science for Advanced Environment, Graduate School of Environmental Studies, Tohoku University, Sendai 980-8579, Japan;5. School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;1. Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, Aoba 6-6-06, Aramakizi, Aoba-ku, Sendai, 980-8579, Japan;2. Center of Material Cycles and Waste Management Research, National Institute for Environmental Studies, Tsukuba 305-8506, Japan;3. Department of Environmental Studies, Graduate School of Environmental Studies, Tohoku University, Aoba 6-6-20, Aramakizi, Aoba-ku, Sendai, 980-8579, Japan;4. School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;1. Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, TX, 78712, USA;2. Environment and Cleaner Production Institute, The Scientific and Technological Research Council of Turkey, Gebze, Kocaeli, Turkey |
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| Abstract: | The addition of readily available high strength organic wastes such as fats, oils, and grease (FOG) from restaurant grease abatement devices may substantially increase biogas production from anaerobic digesters at wastewater treatment facilities. This FOG addition may provide greater economic incentives for the use of excess biogas to generate electricity, thermal, or mechanical energy. Co-digestion of FOG with municipal biosolids at a rate of 10–30% FOG by volume of total digester feed caused a 30–80% increase in digester gas production in two full scale wastewater biosolids anaerobic digesters (Bailey, 2007, Muller et al., 2010). Laboratory and pilot scale anaerobic digesters have shown even larger increases in gas production. However, anaerobic digestion of high lipid wastes has been reported to cause inhibition of acetoclastic and methanogenic bacteria, substrate, and product transport limitation, sludge flotation, digester foaming, blockages of pipes and pumps, and clogging of gas collection and handling systems. This paper reviews the scientific literature on biogas production, inhibition, and optimal reactor configurations, and will highlight future research needed to improve the gas production and overall efficiency of anaerobic co-digestion of FOG with biosolids from municipal wastewater treatment. |
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