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. (November 2018)

• Record Type: Journal Article
• Authors: Jiang, Lu-Man; Zhou, Zhen; Niu, Tianhao; Jiang, Lingyan; Chen, Guang; Pang, Hongjian; Zhao, Xiaodan; Qiu, Zhan
• Is Part Of: Bioresource technology. Volume 267(2018)
• Page Start: 218
• Page End: 226
• Publication Date: 2018-11
• Subjects: Sludge reduction -- Anaerobic side-stream reactor -- Decay -- Hydrolysis -- Microbial community; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2018.07.047
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Anaerobic side-stream reactor (ASSR) coupled MBR was used to treat real wastewater. Sludge reduction was enhanced from 10.2% at HRT of ASSR of 3.3 h to 40.9% at 6.7 h. Anaerobic hydrolysis of inactive particles contributed majorly to sludge reduction. Active cell lysis occurred principally in aerobic conditions. MiSeq sequencing proved ASSR-MBR enriched hydrolytic and fermentative bacteria. 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.