Effect of gradual increase of salt on performance and microbial community during granulation process  

作　　者：Mengfei Wang Junguo He Xiangke Dong Ruimiao Zhang 

机构地区：[1]School of Environment,Harbin Institute of Technology,Harbin 150090,China [2]State Key Laboratory of Urban Water Resources and Environment,Harbin Institute of Technology,Harbin 150090,China [3]School of Civil Engineering,Guangzhou University,Guangzhou 510006,China [4]National Marine Environmental Monitoring Center,Dalian 116023,China

出　　处：《Journal of Environmental Sciences》2025年第1期404-413,共10页环境科学学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.52070048);the Research and Development Project in Key Areas of Guangdong Province(No.2019B110209002).

摘　　要：Salinity was considered to have effects on the characteristics,performance microbial communities of aerobic granular sludge.This study investigated granulation process with gradual increase of salt under different gradients.Two identical sequencing batch reactors were operated,while the influent of Ra and Rb was subjected to stepwise increments of NaCl concentrations(0-4 g/L and 0-10 g/L).The presence of filamentous bacteria may contribute to granules formed under lower salinity conditions,potentially leading to granules fragmentation.Excellent removal efficiency achieved in both reactors although therewas a small accumulation of nitrite in Rb at later stages.The removal efficiencies of chemical oxygen demand(COD),total nitrogen(TN),and total phosphorus(TP)in Ra were 95.31%,93.70%and 88.66%,while the corresponding removal efficiencies in Rb were 94.19%,89.79%and 80.74%.Salinity stimulated extracellular polymeric substances(EPS)secretion and enriched EPS producing bacteria to help maintain the integrity and stability of the aerobic granules.Heterotrophic nitrifying bacteria were responsible for NH_(4)^(+)-N and NO_(2)^(-)-N oxidation of salinity systems and large number of denitrifying bacteria were detected,which ensure the high removal efficiency of TN in the systems.

关 键 词：Aerobic granular sludge(AGS)Salinity Nutrient removal Extracellular polymeric substances(EPS) Microbial community 

分 类 号：X799.3[环境科学与工程—环境工程]