In situ integration of microbial electrochemical systems into anaerobic digestion to improve methane fermentation at different substrate concentrations |
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| Affiliation: | 1. School of Engineering and Information Technology, Murdoch University, WA 6150, Australia;2. CSIRO Land and Water, Floreat, WA 6014, Australia;1. Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;2. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (SKLUWRE, HIT), Harbin 150090, China;3. Technical University of Denmark, Department of Chemical and Biochemical Engineering, Center for BioProcess Engineering, Lyngby, Denmark;1. Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, PR China;2. Institute of Eco-Chongming (IEC), 3663 N. Zhongshan Rd., Shanghai 200062, PR China;3. Shanghai Institute of Pollution Control and Ecological Security, 1515 North Zhongshan Rd. (No. 2), Shanghai 200092, PR China;4. The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 200092 Shanghai, PR China;5. School of Environmental and Material Engineering, Shanghai Second Polytechnic University, Shanghai 201209, PR China;6. Shanghai Municipal Engineering Design Institute (Group) Co., Ltd, Shanghai 200092, PR China;7. Shanghai Waterway Engineering Design and Consulting Co., Ltd, Shanghai 200120, PR China;1. Department of Environmental Science and Technology, University of Maryland, College Park, MD, USA;2. Faculty of Environmental Agricultural Sciences, Arish University, North Sinai, Egypt;3. College of Mechanical and Electrical Engineering, Northwest Agriculture and Forestry University, Yangling, Shaanxi, China;4. Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment, Guilin University of Technology, Guilin, China |
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| Abstract: | Microbial electrochemical system (MES) was integrated into anaerobic digestion (AD) to improve the overall process efficiency by enhancing methane (CH4) production. CH4 fermentation at various glucose concentrations (2, 4, 8 and 10 g/l) was evaluated along with corresponding control (without electrodes) operations. The maximum CH4 yield of 0.34 l- CH4/g COD was obtained with both 2 and 4 g/l glucose concentrations (MES), which was about 1.4 and 2.4 times, respectively, higher than the values obtained with corresponding control operations. However, at 10 g/l, similar performance (～0.07 l- CH4/g COD) was observed with both control and MES operations, which might be due to pH drop occurred by volatile fatty acids (VFAs) buildup in the process. Substrate removal was amplified in the presence of MES with faster degradation of VFAs at all substrate concentrations except 10 g/l. This enhanced utilization of VFAs in the MES process is an important aspect to recover from initial pH drops, especially at higher substrate concentration to maintain the optimum pH for methane fermentation. The current generation and cyclic voltammetric profiles suggest that the enhanced CH4 production in MES was attributed to the bioelectrochemical reactions on the electrodes. |
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| Keywords: | Anaerobic digestion (AD) Microbial electrochemical system (MES) Methane yield pH stability Substrate concentrations |
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