NDLI: In-Situ Sludge Reduction in Membrane-Controlled Anoxic-Oxic-Anoxic Bioreactor: Performance and Mechanism

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In-Situ Sludge Reduction in Membrane-Controlled Anoxic-Oxic-Anoxic Bioreactor: Performance and Mechanism

Content Provider	MDPI
Author	Li, Chengyue Maqbool, Tahir Kang, Hongyu Zhang, Zhenghua
Copyright Year	2022
Description	Conventional and advanced biological wastewater treatment systems generate excess sludge, which causes socio-economic and environmental issues. This study investigated the performance of membrane-controlled anoxic-oxic-anoxic (AOA) bioreactors for in-situ sludge reduction compared to the conventional anoxic-oxic-oxic membrane bioreactor $(MBR_{control}$). The membrane units in the AOA bioreactors were operated as anoxic reactors at lower sludge recirculation rates to achieve hydrolysis of extracellular polymeric substances (EPS) and extensive endogenous respiration. Compared to $MBR_{control}$, the AOA bioreactors operated with 90%, and 80% recirculation rates reduced the sludge growth up to 19% and 30%, respectively. Protein-like components were enriched in AOA bioreactors while fulvic-like components were dominant in $MBR_{control}$. The growth of Dechloromonas and Zoogloea genra was promoted in AOA bioreactors and thus sludge reduction was facilitated. Metagenomics analysis uncovered that AOA bioreactors exhibited higher proportions of key genes encoding enzymes involved in the glycolysis and denitrification processes, which contributed to the utilization of carbon sources and nitrogen consumption and thus sludge reduction.
Starting Page	659
e-ISSN	20770375
DOI	10.3390/membranes12070659
Journal	Membranes
Issue Number	7
Volume Number	12
Language	English
Publisher	MDPI
Publisher Date	2022-06-27
Access Restriction	Open
Subject Keyword	Membranes Environmental Engineering Environmental Sciences Membrane Bioreactor Sludge Reduction Endogenous Respiration Denitrification Metabolic Pathways
Content Type	Text
Resource Type	Article

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