Responses of microbial interactions to elevated salinity in activated sludge microbial community  

作　　者：Tao Ya Zhimin Wang Junyu Liu Minglu Zhang Lili Zhang Xiaojing Liu Yuan Li Xiaohui Wang 

机构地区：[1]Beijing Engineering Research Center of Environmental Material for Water Purification,College of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029,China [2]State Environmental Protection Key Laboratory of Food Chain Pollution Control,Beijing Technology and Business University,Beijing 100048,China [3]Puyang Vocational and Technical College,Puyang 457000,China

出　　处：《Frontiers of Environmental Science & Engineering》2023年第5期93-103,共11页环境科学与工程前沿（英文）

基　　金：supported by the Open Research Fund Program of State Environmental Protection Key Laboratory of Food Chain Pollution Control(China)(FC2022YB08);the Fundamental Research Funds for the Central Universities(China)(JD2227).

摘　　要：Biological treatment processes are critical for sewage purification,wherein microbial interactions are tightly associated with treatment performance.Previous studies have focused on assessing how environmental factors(such as salinity)affect the diversity and composition of the microbial community but ignore the connections among microorganisms.Here,we described the microbial interactions in response to elevated salinity in an activated sludge system by performing an association network analysis.It was found that higher salinity resulted in low microbial diversity,and small,complex,more competitive overall networks,leading to poor performance of the treatment process.Subnetworks of major phyla(Proteobacteria,Bacteroidetes,and Chloroflexi)and functional bacteria(such as AOB,NOB and denitrifiers)differed substantially under elevated salinity process.Compared with subnetworks of Nitrosomonadaceae,Nitrosomonas(AOB)made a greater contribution to nitrification under higher salinity(especially 3%)in the activated sludge system.Denitrifiers established more proportion of cooperative relationships with other bacteria to resist 3%salinity stress.Furthermore,identified keystone species playing crucial roles in maintaining process stability were dynamics and less abundant under salinity disturbance.Knowledge gleaned from this study deepened our understanding of microbial interaction in response to elevated salinity in activated sludge systems.

关 键 词：Elevated salinity Activated sludge system Pollution removal Microbial interactions Competitive relationship 

分 类 号：X703[环境科学与工程—环境工程] X172