Synergistic effect of kitchen waste and sludge anaerobic fermentation for methane production
CHANG Cheng1, MING Lei-qiang2, MOU Yun-fei1, HUA Zhi-liang2, LI Xian-guo1, ZHANG Da-hai1
1. School of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266000, China; 2. Air Liquide (China) R&D Co., Ltd., Shanghai 200030, China
Abstract：Excess sludge and kitchen waste were co-fermented to evaluate the synergistic effect of anaerobic fermentation. Based on the volatile solid suspension, excess sludge and kitchen waste ratios of 1:0, 4:1, 2:1, 1:1, 1:2, 1:4, 0:1 were employed to conduct the biochemical methane potential experiments. The synergistic methanogenic effect was evaluated by combining the changes of pH, COD, TN, NH4+-N, NO3--N, gas production, carbon migration and transformation, and microbial community structure before and after anaerobic fermentation. During anaerobic fermentation of excess sludge, the addition of kitchen waste could significantly improve the sludge degradation ability of microorganisms and increase methane production. The maximum methane production at the ratio of 1:4was 274.37mL/g-VSS, with a synergistic growth rate of 27.41%. The addition of kitchen waste delayed the methanogenic time, promoted the transfer of carbon elements from solid phase to liquid phase to gas phase, and increased the growth and reproduction of methanogenic bacteria (Methansaeta) and their auxiliary bacteria (Longilinea, etc.).
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