College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China.
College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
Bioresour Technol. 2018 Nov;267:218-226. doi: 10.1016/j.biortech.2018.07.047. Epub 2018 Jul 10.
An anoxic/oxic membrane bioreactor (AO-MBR) and three anaerobic side-stream reactor (ASSR) coupled MBRs (ASSR-MBR) were operated to investigate the effects of hydraulic retention time of ASSR (HRT) and to elucidate sludge reduction mechanisms in ASSR-MBRs. Increasing HRT from 3.3 to 6.6 h improved nitrogen removal, and enhanced sludge reduction from 8.0% to 40.9% in ASSR-MBR. The sludge decay coefficient was 0.0221 d in MBRs, and 0.0231-0.0345 d in ASSRs. The measured lysis rate coefficient of heterotrophic biomass was 0.083-0.112 d in MBRs and 0.079-0.111 d in ASSRs. The hydrolysis rate coefficient of inactive particulate organic matters (POMs) in ASSRs significantly exceeded that in the MBR. At HRT of 6.6 h, POMs hydrolysis in ASSR (38.6%) is the dominant route of sludge reduction, and cell lysis occurred principally in aerobic tanks. Illumina-MiSeq sequencing showed ASSR-MBRs enriched hydrolytic and fermentative bacteria, and confirmed that anaerobic hydrolysis contributed most to sludge reduction.
缺氧/好氧膜生物反应器（AO-MBR）和三个厌氧侧流反应器（ASSR）耦合的 MBR（ASSR-MBR）被运行，以研究 ASSR 的水力停留时间（HRT）的影响，并阐明 ASSR-MBR 中的污泥减少机制。将 ASSR-MBR 中的 ASSR 的水力停留时间从 3.3 小时增加到 6.6 小时，提高了氮的去除率，并将污泥减少率从 8.0%提高到 40.9%。MBR 中的污泥衰减系数为 0.0221 d，ASSR 中的污泥衰减系数为 0.0231-0.0345 d。在 MBR 和 ASSR 中，异养生物质的测量裂解速率系数分别为 0.083-0.112 d 和 0.079-0.111 d。ASSR 中惰性颗粒有机物质（POM）的水解速率系数明显高于 MBR。在 HRT 为 6.6 小时时，ASSR 中的 POM 水解（38.6%）是污泥减少的主要途径，细胞裂解主要发生在好氧池中。Illumina-MiSeq 测序表明，ASSR-MBR 富集了水解和发酵细菌，并证实了厌氧水解对污泥减少的贡献最大。
