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Zheng Y, Zhou Z, Ye X, Huang J, Jiang L, Chen G, Chen L, Wang Z. Identifying microbial community evolution in membrane bioreactors coupled with anaerobic side-stream reactor, packing carriers and ultrasonication for sludge reduction by linear discriminant analysis. BIORESOURCE TECHNOLOGY 2019; 291:121920. [PMID: 31382094 DOI: 10.1016/j.biortech.2019.121920] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Revised: 07/23/2019] [Accepted: 07/25/2019] [Indexed: 06/10/2023]
Abstract
An anoxic/oxic membrane bioreactor (AO-MBR), an anaerobic side-stream reactor (ASSR) coupled MBRs (A-MBRs), an A-MBR with carriers packed in ASSR (AP-MBR) and an AP-MBR with sludge ultrasonicated before ASSR (AUP-MBR) were operated for 261 d to investigate effects of ASSR, packing carriers and ultrasonication on sludge reduction and microbial population. Sludge reduction efficiencies of A-MBR, AP-MBR and AUP-MBR were 36.2%, 46.4% and 51.4%, respectively. Packing carriers and ultrasonication both enhanced hydrolysis by stimulating activities of α-glucosidase and protease, while uncoupling metabolism was enhanced greatly by packing carriers but slightly by ultrasonication. Linear discriminant analysis of effect size (LEfSe) results showed that packing carriers promoted the growth of hydrolytic and fermentative bacteria in bulk sludge, and enriched anaerobes and fermentative bacteria on the surface of carriers. Ultrasonication screened ultrasonication-resistant bacteria, and created an anaerobic environment beneficial to hydrolytic and fermentative bacteria.
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Affiliation(s)
- Yue Zheng
- Shanghai Engineering Research Center of Energy - Saving in Heat Exchange Systems, College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
| | - Zhen Zhou
- Shanghai Engineering Research Center of Energy - Saving in Heat Exchange Systems, College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
| | - Xiaofang Ye
- Shanghai Engineering Research Center of Energy - Saving in Heat Exchange Systems, College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
| | - Jing Huang
- Shanghai Engineering Research Center of Energy - Saving in Heat Exchange Systems, College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
| | - Lingyan Jiang
- Shanghai Chengtou Wastewater Treatment Co Ltd, Shanghai 201203, China
| | - Guang Chen
- Shanghai Chengtou Wastewater Treatment Co Ltd, Shanghai 201203, China
| | - Liuyu Chen
- Shanghai Engineering Research Center of Energy - Saving in Heat Exchange Systems, College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
| | - Zhiwei Wang
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
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