Abstract：A high-solid anaerobic membrane bioreactor (AnMBR) process was developed to investigate the effects of organic loading rate (OLR) on the treatment of excess sludge and food waste. When the OLR was 4gCOD/(L·d), the methane yield reached (301.5±4.2) mLCH4/gCODfed, which was related to the high hydrolysis rate (78.8%) and specific methanogenic activity. When the OLR was 4~8gCOD/(L·d), a long-term stable operation at a low membrane fouling rate (0.3kPa/d) was achieved by adjusting the effluent pump operating mode. After physical and chemical cleaning, SEM-EDX analysis showed that the fouled membrane could be restored to the original form, and the contents of C, Fe, P and other elements were significantly reduced. Metagenomics sequencing showed that Defluviitoga was the dominant genus of bacteria when the OLR was 4gCOD/(L·d). Methanosarcina was the dominant archaea (76.9%). When the OLR increased to 8gCOD/(L·d), the relative abundance of Methanothrix improved significantly to 50.4% being the dominant archaea at this stage, and the archaea community was greatly affected by OLR variations. Under high OLR conditions (such as 11g COD/(L·d)), the relative abundance of Methanoculleus increased gradually (0.7% to 2.4%). The results of macrogene sequencing showed that the inhibition of hydrogen-trophic methanogenesis activity under high load may be related to the changes in the proportion of metabolic pathways of K14126(mvhA), K00205 (fwdF, fmd) and K00125(fdhB). Selecting appropriate OLRs is conducive to establishing stable microbial community and efficient anaerobic co-digestion metabolic pathway, which promotes the bioconversion of organic wastes to methane.
程东兴, 胡以松, 屈艺, 刘乐, 王嘉顺. AnMBR处理剩余污泥与厨余共消化的效能研究[J]. 中国环境科学, 2023, 43(9): 4676-4687.
CHENG Dong-xing, HU Yi-song, QU-Yi, LIU-Le, WANG Jia-shun. Study on the performance of AnMBR in treating the co-digestion of sewage sludge and food waste. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(9): 4676-4687.
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