文献类型：期刊文献

英文题名：Enhancement of the removal and settling performance for aerobic granular sludge under hypersaline stress

作者：Ou, Dong[1];Li, Wei[1,2];Li, Hui[1,2];Wu, Xiao[1];Li, Cheng[1];Zhuge, Yangyang[1];Liu, Yong-di[1,2]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Resources & Environm Engn, Natl Engn Lab Ind Wastewater Treatment, Shanghai 200237, Peoples R China

年份：2018

卷号：212

起止页码：400

外文期刊名：CHEMOSPHERE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000447478100044)】；

基金：This work was financially supported by the National Natural Science Foundation of China (51578240, 51378208, and 41273109), the National key research and development plan (2016YFC0206200), Open Foundation of State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences (SKLECRA2016OFP19), the Fok Ying Tung Education Foundation (141077), the Innovation Program of the Shanghai Municipal Education Commission (14ZZ059), Fundamental Research Funds for the Central Universities (WB1516015, WB1616012, WB1814053). We would like to thank the anonymous referees for their helpful comments regarding this paper.

语种：英文

外文关键词：Saline wastewater; Removal and settling performance; Aerobic granular sludge; Microbial community succession; PICRUSt

摘要：The aerobic granular sludge (AGS) dominated by halophilic microorganisms, was successfully cultivated in a lab-scale sequencing batch reactor (SBR) under varying salinity levels (from 0% to 6% (w/v)). Removal performance of AGS improved with the increase of salinity and increased up to 42.86 mg g(-1) VSS h(-1) at 6% salinity. Increased salinity resulted in better settling performance of AGS in terms of the sludge volume index (SVI), which was initially 148.80 mL/g at 0% salinity and gradually decreased to 59.1 mL/g at 6% salinity. The increase of salinity stimulated bacteria to secret excessive extracellular polymeric substances (EPS), with its highest production of 725.5 mg/(g.VSS) at 5% salinity. The total protein (PN) exhibited highly positive correlation with the total EPS (R = 0.951), indicating that selective secretion of some functional PN played a key constituent in resisting the external osmotic pressure and improving sludge performance. Salinicola, accounted for up to 91% relative abundance at 6% salinity, showed the high positive correlation (R = 0.953) with salinity. The enrichment of such halophilic or halotolerant microbial community assured both stable and improved removal performance in the AGS system. The enrichment of salt response pathways and altered metabolic processes for salt-tolerant bacteria indicated that the microbial community formed special metabolic pattern under long-term hypersaline stress to maintain favourable cellular activity and removal performance. (C) 2018 Elsevier Ltd. All rights reserved.