Enhanced total nitrogen removal and membrane fouling control by increasing biomass in MBR equipped with ceramic membrane  

作　　者：Shan-shan Gao Xing Yin Rui Huang Jia-yu Tian 

机构地区：[1]School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China [2]Guangdong GDH Water Co.,Ltd.,Shenzhen 518021,China

出　　处：《Water Science and Engineering》2024年第4期352-360,共9页水科学与水工程(英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant No.51978232);the Natural Science Foundation of Tianjin City(Grant No.19JCJQJC63000);the Natural Science Foundation of Hebei Province(Grant No.E2019202012);the Science and Technology Project of Hebei Education Department of China(Grant No.QN2019022).

摘　　要：Simultaneous nitrification and denitrification(SND)is an efficient method to remove nitrogen in municipal wastewater treatment.However,low dissolved oxygen(DO)concentrations are generally required,leading to serious membrane fouling in membrane bioreactors(MBRs).This study aimed to clarify the synergistic effect of biomass and DO on nitrogen removal and membrane fouling.To achieve this goal,four submerged MBRs equipped with ceramic membranes were operated with different biomass(mixed liquor suspended solids(MLSS))concentrations(3000 mg/L,5000 mg/L,7500 mg/L,and 12000 mg/L)under various DO concentrations(2.0 mg/L,1.0 mg/L,and 0.5 mg/L).As a result,increasing biomass in the MBRs enhanced total nitrogen(TN)removal via SND,and excellent TN removal efficiencies of 60.7%and 75.8%were obtained using the MBR with an MLSS concentration of 12000 mg/L and DO concentrations of 2.0 mg/L and 1.0 mg/L.However,a further decrease in DO deteriorated TN removal due to the inhibition of nitrification.Moreover,high MLSS concentrations were beneficial to membrane fouling control for ceramic membranes in MBRs.The lowest transmembrane pressure development rate was observed for the MBR with an MLSS concentration of 12000 mg/L.High biomass offset the adverse effect of DO decrease on membrane fouling to some extent,and improved the stability of the reactor.Therefore,biomass might be an important parameter for membrane fouling reduction in ceramic MBRs.Overall,optimal biomass and DO concentrations for TN removal were identified,providing useful information for the successful operation of MBRs with efficient TN removal and membrane fouling control.

关 键 词：Membrane bioreactor Ceramic membrane Simultaneous nitrification and denitrification Membrane fouling Dissolved oxygen BIOMASS 

分 类 号：X70[环境科学与工程—环境工程]