Effects of pH on the production of volatile fatty acids from citrus waste and waste activated sludge by anaerobic co-fermentation
SUN Hong1, XIAO Xiang-zhe1, LUO Jin-cai1, ZHANG Liang1, LIN Peng1, DONG Shan-yan1,2, ZHU Yi-chun1,2
1. School of Civil and Surveying &Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China; 2. Research Center for Water Quality Security Technology at Ganjiang River Basin, Ganzhou 341000, China
Abstract：In order to improve the production of volatile fatty acids (VFA), the effects of different ratios of volatile solids(VS) from citrus waste and waste activated sludge and regulating pH in fermentation processes were studied. The results showed that adjusting the pH of the co-fermentation system to 6could promote the accumulation of VFA. When the ratio of VS from citrus waste and waste activated sludge reached 2, the maximum VFA yield was 11183.12mg/L, which was 1.75times higher than that without pH control. Furthermore, the essential oil from citrus waste could inhibit the methanogenic process, which was strengthened by controlling pH in the fermentation process. After adding citrus waste, the microbial community structure of the co-fermentation system showed significant advantages. VFA related microbial population increased significantly while methanogenic bacteria consuming acetic acid decreased, which was conducive to the accumulation of VFA. The results of this experiment can provide a theoretical basis for optimizing the performance of VFA production by anaerobic co-fermentation of citrus waste and waste activated sludge.
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SUN Hong, XIAO Xiang-zhe, LUO Jin-cai, ZHANG Liang, LIN Peng, DONG Shan-yan, ZHU Yi-chun. Effects of pH on the production of volatile fatty acids from citrus waste and waste activated sludge by anaerobic co-fermentation. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(4): 1762-1769.
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