Effects of substrate ratios and sulfates on methanogenesis in an AnMBR
MIAO Yan, WANG Zhi-wei, MEI Xiao-jie, WU Zhi-chao
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
In this study, effects of substrate ratios and COD/SO4--S ratios on specific methanogenic activities (SMAs) and biochemical methane potentials (BMPs) in the anaerobic membrane bioreactor (AnMBR) were investigated, and the mechanisms of sulfate reduction and methanogenesis were elaborated. The results show that when the maximum SMA was obtained when the substrate ratio of acetic acid and propionic acid was 60%. When the ratio of acetic acid and propionic acid was lower than 40%, the conversion of propionic acid into acetic acid became the limiting step for methane generation, subsequently decreasing SMAs. When the ratio was higher than 60%, SMAs was restrained by the metabolism of acetic acid. In the presence of sulfate, the SMAs and BMPs were both inhibited as the COD/SO4--S ratio was lower than 20 and the acetate metabolism was restrained with the ratio less than 10. In terms of sulfate metabolism, 80% of sulfate was converted to sulfide (H2S, HS-, S2-) when the COD/SO4--S ratio was lower than 25, whereas only 14% of sulfate was converted to sulfide when the sulfate was insufficient (COD/SO4--S>25).
苗妍, 王志伟, 梅晓洁, 吴志超. 基质配比及硫酸盐对AnMBR产甲烷性能的影响[J]. 中国环境科学, 2017, 37(3): 998-1002.
MIAO Yan, WANG Zhi-wei, MEI Xiao-jie, WU Zhi-chao. Effects of substrate ratios and sulfates on methanogenesis in an AnMBR. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(3): 998-1002.
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