Sludge reduction and microbial structures of aerobic, micro-aerobic and anaerobic side-stream reactor coupled membrane bioreactors. (November 2018)

• Record Type: Journal Article
• Authors: Pang, Hongjian; Zhou, Zhen; Niu, Tianhao; Jiang, Lu-Man; Chen, Guang; Xu, Biao; Jiang, Lingyan; Qiu, Zhan
• Is Part Of: Bioresource technology. Volume 268(2018)
• Page Start: 36
• Page End: 44
• Publication Date: 2018-11
• Subjects: Sludge reduction -- Side-stream reactor -- Membrane bioreactor -- Micro-aerobic -- 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.2018.07.097
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: DO effect on sludge reduction was studied by side-stream reactor (SSR) coupled MBR. Anaerobic and micro-aerobic SSR-MBR obtained higher nitrogen removal than aerobic. Micro-aerobic SSR-MBR had higher sludge reduction (61.1%) than anaerobic and aerobic. Anaerobic SSR favored hydrolysis and fermentation, and aerobic enriched slow growers. Micro-aerobic SSR benefited hydrolytic, fermentative and slow-growing bacteria. Abstract: An anoxic/oxic membrane bioreactor (MBR) and three side-stream reactor (SSR) coupled membrane bioreactors were operated in parallel to investigate effects of dissolved oxygen (DO) level in SSR on sludge reduction and microbial community structure of SSR-MBRs. The four MBRs were equally efficient in COD and ammonium nitrogen removal. The anaerobic and micro-aerobic SSR favored nitrogen removal through denitrification, simultaneous nitrification and denitrification and autochthonous substrate release as carbon source. The micro-aerobic SSR achieved greatly higher sludge reduction efficiency (61.1%) than anaerobic (37.3%) and aerobic SSR (7.9%). Micro-aerobic SSR obtained the highest endogenous decay constant (0.035 d −1 ) compared to anaerobic (0.023 d −1 ) and aerobic SSR (0.015 d −1 ). High-throughput sequencing results revealed that anaerobic SSR enriched hydrolytic and fermentative bacteria, aerobic environment favored the growth of slow-growing bacteria, and micro-aerobic SSR stimulated biological activities of both anaerobic and aerobic bacteria.