Performance evaluation of the effect of humic acid on Anammox granular sludge:Apparent morphology,nitrogen removal and microbial community  

作　　者：Wenhui Huang Peiling Xu Xiang Li Yong Huang Hao Sun Wei Li Mao Zhang Miao Shi Yan Yuan 

机构地区：[1]School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,China [2]Suzhou Hongyu Environmental Technology Company Limited by Shares,Suzhou 215011,China [3]Suzhou Tianjun Environmental Technology Limited Company,Suzhou 215011,China [4]Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment,Suzhou University of Science and Technology,Suzhou 215009,China

出　　处：《Journal of Environmental Sciences》2024年第10期148-158,共11页环境科学学报（英文版）

基　　金：This work was supported by the Natural Science Foundation of China(No.51938010);the Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment(No.XTCXSZ2022-1).

摘　　要：Humic acid(HA)is a typical refractory organicmatter,so it is of great significance to investigate its effect on the performance of Anammox granular sludge.When the dosage ofHA≤50 mg/L,HA promotes the total nitrogen removal rate(NRR)to 1.45 kg/(m^(3)·day).When HA was between 50 and 100 mg/L,the NRR of Anammox was stable.At this time,the adsorption of HA causes the sludge to gradually turn fromred to brown,but the activities of heme and enzymes showed that its capacitywas not affected.When HA levels reached 250 mg/L,the NRR dropped to 0.11 kg/(m^(3)·day).Moderate HA levels promoted the release of extracellular polymeric substance(EPS),but excessive HA levels lead to a decrease in EPS concentrations.HA inhibited Anammox activity,which indirectly hindered the transmission of substrate and accumulated substrate toxicity.Although HA promoted the increase of heterotrophicmicrobial abundance in Anammox system,the microbial diversity decreased gradually.With the increase of HA concentration,the abundance of Candidatus_Brocadia,the main functional microorganism of Anammox system,decreased gradually,while the abundance of Candidatus_Kuenenia increased gradually.

关 键 词：ANAMMOX Landfill leachate Humic acid HEME Microbial community Enzyme activity 

分 类 号：X703[环境科学与工程—环境工程]