Resistance to salt stresses by aerobic granular sludge:sludge property and microbial community  

作　　者：Xiao Wu Hui Li Meili Wang Tianying Zhang Jiawei Li Yongdi Liu 

机构地区：[1]Key Laboratory of Pollution Control Chemistry and Environmental Functional Materials for Qinghai-Tibet Plateau of the National Ethnic Affairs Commission,School of Chemistry and Environment,Southwest Minzu University,Chengdu 610041,China [2]Institute for Environmental Pollution and Health,School of Environmental and Chemical Engineering,Shanghai University,Shanghai 200444,China [3]School of Life Sciences,Southwest University,Chongqing 400715,China [4]State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process,School of Resources and Environmental Engineering,East China University of Science and Technology,Shanghai 200237,China [5]Institute of Qinghai-Tibetan Plateau,Southwest Minzu University,Chengdu 610041,China

出　　处：《Frontiers of Environmental Science & Engineering》2024年第8期107-116,共10页环境科学与工程前沿（英文）

基　　金：financially supported by the National Natural Science Foundation of China(No.51578240);the South-West Minzu University Research Startup Funds(China)(No.RQD2022034).

摘　　要：Saline wastewater is regarded as a challenge for wastewater treatment plants because high-salinity conditions negatively affect on traditional biological technologies.Aerobic granular sludge(AGS)has gained attention as a promising technology for saline wastewater treatment because of its compact structure and the ability to withstand toxic loadings.Therefore,this study investigated the saltresistance performance,sludge properties and microbial community of AGS under low-salinity and high-salinity conditions,with the saline concentrations ranging from 0 to 50 g/L.The results showed that AGS could withstand long-term saline stresses,and the maximum salinity reached 50 g/L within 113 d.Under salinities of 10,30,and 50 g/L,the chemical oxygen demand(COD)removal efficiencies were 90.3%,88.0%and 78.0%,respectively.AGS also its maintained strength and aggregation at salinities of 10 and 30 g/L.Overproduction of extracellular polymeric substances(EPS)by non-halophilic bacteria that enhanced sludge aggregation.The compact structure that ensured the microorganisms bioactivity helped to remove organic matters under salinities of 10 and 30 g/L.At a salinity of 50 g/L,moderately halophilic bacteria,including Salinicola,Thioclava,Idiomarina and Albirhodobacter,prevailed in the reactor.The dominant microbial communities shifted to moderately halophilic bacteria,which could maintain aerobic granular stabilization and remove organic matters under 50 g/L salinity.These results in this study provide a further explanation for the long-term operation of AGS for treating saline wastewater at different salinities.It is hoped that this work could bring some clues for the mystery of salt-resistance mechanisms.

关 键 词：Aerobic granular sludge Long-term saline stresses Performance Sludge property Microbial community 

分 类 号：X703[环境科学与工程—环境工程] X17