Biogas production from brown grease using a pilot-scale high-rate anaerobic digester |
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| Affiliation: | 1. College of Environment and Energy, South China University of Technology, Guangzhou, 510006, China;2. Department of Chemical Engineering, Lamar University, Beaumont, TX 77710-10053, USA;3. Department of Civil Engineering, Lamar University, Beaumont, TX 77710-10024, USA;4. Department of Mechanical Engineering, Lamar University, Beaumont, TX 77710-10028, USA;5. Meridian Bioenergy, Inc., The Woodlands, TX 77380, USA;6. MeadWestvaco Corporation, Richmond, VA 23219-0501, USA;1. Institute of Environmental Engineering, Faculty of Infrastructure and Environment, Czestochowa University of Technology, Brzeźnicka Street 60a, 42-200 Czestochowa, Poland;2. Mineral and Energy Economy Research Institute, Polish Academy of Sciences, 31-261 Cracow, Poland;3. Université Lille Nord de France, LGCgE-Lille 1, Ecologie Numérique et Ecotoxicologie, F-59650 Villeneuve d''Ascq, France;4. University of Arizona, 1200 E University Blvd, Arizona, PO Box 210073, Tucson, AZ 8572185721-0073, USA;1. Center for Material Cycles and Waste Management Research, National Institute for Environmental Studies, Tsukuba, 305-8506, Japan;2. School of Ecological and Environmental Sciences, East China Normal University, Shanghai, 200241, China;3. Life and Environmental Sciences, University of Tsukuba, Tsukuba, 305-0005, Japan |
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| Abstract: | Food wastes are typically disposed of in landfills for convenience and economic reasons. However, landfilling food wastes increases the organic content of leachate and the risk of soil contamination. A sound alternative for managing food wastes is anaerobic digestion, which reduces organic pollution and produces biogas for energy recovery. In this study, anaerobic digestion of a common food waste, brown grease, was investigated using a pilot-scale, high-rate, completely-mixed digester (5.8 m3). The digestibility, biogas production and the impact of blending of liquid waste streams from a nearby pulp and paper mill were assessed. The 343-day evaluation was divided into 5 intensive evaluation stages. The organic removal efficiency was found to be 58 ± 9% in terms of COD and 55 ± 8% in terms of VS at a hydraulic retention time (HRT) of 11.6 ± 3.8 days. The removal was comparable to those found in organic solid digesters (45–60%), but at a much shorter HRT. Methane yield was estimated to be 0.40–0.77 m3-CH4@STP kg-VSremoved−1, higher than the typical range of other food wastes (0.11–0.42 m3-CH4@STP kg-VSremoved−1), with a mean methane content of 75% and <200 ppm of hydrogen sulfide in the biogas. The blending of selected liquid wastes from a paper mill at 10 vol% of brown grease slurry did not cause significant reduction in digester performance. Using a pseudo-first-order rate law, the observed degradation constant was estimated to be 0.10–0.19 d−1 compared to 0.03–0.40 d−1 for other organic solids. These results demonstrate that brown grease is a readily digestible substrate that has excellent potential for energy recovery through anaerobic digestion. |
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| Keywords: | Brown grease Biogas Anaerobic digestion Renewable energy |
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