Effect of different acetate:propionate ratios on the methanogenic community during thermophilic anaerobic digestion in batch experiments |
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| Institution: | 1. State Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC), School of Environment, Tsinghua University, Beijing 100084, China;2. Beijing Enterprises Water Group Limited, Beijing 100124, China;1. School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China;2. Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, PR China;3. Instrumental Analysis Center of Zhejiang Gongshang University, Hangzhou 310018, PR China;4. Huadong Engineering Corporation Limited of Power China, Hangzhou 311122, PR China;5. Jiaxing Green Energy Environmental Protection Technology Co., Ltd., Jiaxing 314015, PR China |
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| Abstract: | The present study investigated the metabolism of different acetate:propionate ratios (0.25, 0.33, 0.5, 1.0, 2.0, 3.0, 4.0) in equimolar carbon concentration during an anaerobic decomposition process under defined laboratory conditions and evaluated the engaged methanogenic community. Significant differences on a metabolic level (gas production, gas composition, volatile fatty acid (VFA) concentration) were observed between acetate:propionate ratios ≤1 and ≥2. Generally ratios ≥2 resulted in a faster methane production and VFA decomposition compared to ratios ≤1. Regarding the composition of the methanogenic community as well as the abundance of Methanosarcinales these differences were not reflected in an appropriate manner when DNA based methods (dHPLC and qPCR) were applied. However, by a culture based approach these differences could be documented showing a significant difference in the number of cultivable methanogens between initial acetate:propionate ratios ≤1 and ≥2. |
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| Keywords: | Acetate Propionate Methanogenic community Methanogens Acetate propionate ratio Biogas |
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