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Bioresour Technol. 2018 Nov;267:218-226. doi: 10.1016/j.biortech.2018.07.047. Epub 2018 Jul 10.

Effects of hydraulic retention time on process performance of anaerobic side-stream reactor coupled membrane bioreactors: Kinetic model, sludge reduction mechanism and microbial community structures.

Author information

1
College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China.
2
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. Electronic address: zhouzhen@shiep.edu.cn.
3
Shanghai Chentou Wastewater Treatment Co., Ltd, Shanghai 201203, China.

Abstract

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 (HRTA) and to elucidate sludge reduction mechanisms in ASSR-MBRs. Increasing HRTA 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-1 in MBRs, and 0.0231-0.0345 d-1 in ASSRs. The measured lysis rate coefficient of heterotrophic biomass was 0.083-0.112 d-1 in MBRs and 0.079-0.111 d-1 in ASSRs. The hydrolysis rate coefficient of inactive particulate organic matters (POMs) in ASSRs significantly exceeded that in the MBR. At HRTA 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.

KEYWORDS:

Anaerobic side-stream reactor; Decay; Hydrolysis; Microbial community; Sludge reduction

PMID:
30025317
DOI:
10.1016/j.biortech.2018.07.047
[Indexed for MEDLINE]

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