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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.
- Source :
-
Bioresource Technology . Nov2018, Vol. 267, p218-226. 9p. - Publication Year :
- 2018
-
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 (HRT A ) and to elucidate sludge reduction mechanisms in ASSR-MBRs. Increasing HRT A 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 HRT A 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09608524
- Volume :
- 267
- Database :
- Academic Search Index
- Journal :
- Bioresource Technology
- Publication Type :
- Academic Journal
- Accession number :
- 131253383
- Full Text :
- https://doi.org/10.1016/j.biortech.2018.07.047