Nitrification performance evaluation of activated sludge under high potassium ion stress during high-ammonia nitrogen organic wastewater treatment  

作　　者：Xiaomei Jiang Heng Wang PeikeWu Hong Wang Liangwei Deng Wenguo Wang 

机构地区：[1]Key Laboratory of Development and Application of Rural Renewable Energy,Biogas Institute of Ministry of Agriculture and Rural Affairs,Chengdu 610041,China [2]Sichuan Academy of Environmental Policy and Planning,Chengdu 610041,China [3]Institute of Urban Agriculture,Chinese Academy of Agricultural Sciences,Chengdu 610213,China

出　　处：《Journal of Environmental Sciences》2022年第1期84-92,共9页环境科学学报（英文版）

基　　金：supported by the Sichuan Science&Technology Program(No.2020YFS0438);the National Natural Science Foundation of China(No.31971386);the China Agriculture Research System(No.CARS-35);the Fundamental Research Funds for Central Non-profit Scientific Institution(No.2060302-022-21-016)。

摘　　要：The recycling reverse osmosis(RO)membrane concentrate of some high-ammonia nitrogen(NH_(4)^(+)-N)organic wastewater to the biological unit could cause potassium ion(K^(+))accumulation,thereby affecting the removal of NH_(4)^(+)-N by activated sludge.Thus,the effects of high K^(+) stress on activated sludge nitrification performance was studied.The results showed that the high K^(+) stress promoted the floc sludge to produce more extracellular polymers(EPS),which accelerated the sludge sedimentation and enriched the biomass in sequential batch reactors(SBRs).The ammonia oxidation process and nitrite(NO_(2)^(-)-N)oxidation process were further analyzed in the nitrification process.High K^(+) stress enriched ammonia oxidizing bacteria(AOB),which ensured the efficient ammonia oxidation process in SBRs,and ensured the removal rate of NH_(4)^(+)-N was maintained above 93%.However,high K^(+) stress(15g/L KCl)inhibited the activity of NO_(2)^(-)-N oxidizing bacteria(NOB)and reduced the abundance of NOB,thus leading to the accumulation of NO_(2)^(-)-N,and finally worsened the nitrification performance of activated sludge.In short,the performance of activated sludge will not be inhibited when the K^(+) in the wastewater does not exceed 5.23 g/L.The results could provide a reference for the optimization of the biological performance in treating high-NH_(4)^(+)-N organic wastewater with activated sludge coupled RO membrane treatment process.

关 键 词：Potassium ion(K^(+)) Activated sludge NITRIFICATION High-ammonia nitrogen organic WASTEWATER Microbial community 

分 类 号：X703[环境科学与工程—环境工程]