期刊
MEMBRANES
卷 12, 期 7, 页码 -出版社
MDPI
DOI: 10.3390/membranes12070659
关键词
membrane bioreactor; sludge reduction; endogenous respiration; denitrification; metabolic pathways
类别
资金
- National Natural Science Foundation of China [52170041, 52050410336]
- Tsinghua SIGS Start-up Funding [QD2020002N]
- Committee of Science and Technology Innovation of Shenzhen [JCYJ20190813163401660]
This study investigated the performance of membrane-controlled AOA bioreactors compared to conventional MBRcontrol in reducing excess sludge generation. The results showed that AOA bioreactors could effectively reduce sludge growth and promote the growth of specific microorganisms, leading to sludge reduction.
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 (MBRcontrol). 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 MBRcontrol, 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 MBRcontrol. 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.
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