文献类型：期刊文献

英文题名：Performance and bacterial characteristics of aerobic granular sludge in Check for response to alternating salinity

作者：Hou, Meng[1];Li, Wei[1,2,3,4];Li, Hui[5];Li, Cheng[1];Wu, Xiao[1];Liu, Yong-di[1,2,3,4]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, 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;[3]East China Univ Sci & Technol, Sch Resources & Environm Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[4]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China;[5]Shanghai Univ, Sch Environm & Chem Engn, Inst Environm Pollut & Hlth, Shanghai 200444, Peoples R China

年份：2019

卷号：142

起止页码：211

外文期刊名：INTERNATIONAL BIODETERIORATION & BIODEGRADATION

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000473377000025)】；

基金：This work was financially supported by National Natural Science Foundation of China of China (51578240, 51808223), Fundamental Research Funds for the Central Universities (222201814053, 222201817009). We would like to thank the anonymous referees for their helpful comments regarding this paper.

语种：英文

外文关键词：Aerobic granular sludge; Salt fluctuation; c-di-GMP; Performance; Microbial community

摘要：Salt concentration often fluctuates in influent industrial wastewater. The behavior of aerobic granular sludge (AGS) in response to the stress of alternating salt concentrations remains unclear. In this study, we ran six identical sequencing batch reactors to follow the performance and microbial characteristics of AGS under 1%, 2%, 4% salinity and corresponding alternating salinity, respectively. The results demonstrated that when compared with the control, alternating salinity not only increased the COD removal efficiency of the reactor significantly (p < 0.001) but also generated high concentration of granular biomass with good settling ability. Pearson correlation analysis indicated that the microorganism mostly used an intracellular second messenger molecule c-di-GMP to regulate extracellular polymer contents. Specifically, the increase of extracellular polysaccharide was conducive to the cohesive strength of the granules, resulting in higher biomass concentration and carbon removal efficiency. Additionally, microbial community analysis confirmed that the relative abundance of c-di-GMP pathway-dependent community, in particular Propionibacterium (24.4%-50.9%), was significantly more dominant under alternating salt conditions.