Effects of Al^3+on pollutant removal and extracellular polymeric substances(EPS)under anaerobic,anoxic and oxic conditions  

作　　者：Lanhe Zhang Jing Zheng Jingbo Guo Xiaohui Guan Suiyi Zhu Yanping Jia Jian Zhang Xiaoyu Zhang Haifeng Zhang 

机构地区：[1]School of Chemical Engineering,Northeast Electric Power University,Jilin 132012,China [2]Key Laboratory of Songliao Aquatic Environment,Ministry of Education,Jilin Jianzhu University,Changchun 130118,China [3]School of Civil and Architecture Engineering,Northeast Electric Power University,Jilin 132012,China [4]School of Environment,Northeast Normal University,Changchun 130117,China

出　　处：《Frontiers of Environmental Science & Engineering》2019年第6期69-79,共11页环境科学与工程前沿（英文）

基　　金：This research was financially supported by the National Natural Science Foundation of China(Grant Nos.51678119 and 51808254);the Science and Technology Development Program of Jilin Province(Nos.20180201016SF and 20180101079JC);the Scientific Research Foundation from Education Department of Jilin Province(Nos.JJKH20180453KJ and JJKH20180454KJ).

摘　　要：Aluminum ions produced by aluminum mining,electrolytic industry and aluminum-based coagulants can enter wastewater treatment plants and interact with activated sludge.They can subsequently contribute to the removal of suspended solids and affect activated sludge flocculation,as well as nitrogen and phosphorus removal.In this study,the effects of Al^3+on pollutant removal,sludge flocculation and the composition and structure of extracellular polymeric substances(EPS)were investigated under anaerobic,anoxic and oxic conditions.Results demonstrated that the highest chemical oxygen demand(COD)and total nitrogen(TN)removal efficiencies were detected for an Al^3+concentration of 10 mg/L.In addition,the maximal dehydrogenase activity and sludge flocculation were also observed at this level of Al^3+.The highest removal efficiency of total phosphorus(TP)was achieved at an Ar+concentration of30 mg/L.The flocculability of sludge in the anoxic zone was consistently higher than that in the anaerobic and oxic zones.The addition of Al^3+promoted the secretion of EPS.Tryptophan-like fluorescence peaks were detected in each EPS layer in the absence of Al^3+.At the Al^3+concentration of 10 mg/L,fulvic acid and tryptophan fluorescence peaks began to appear while the majority of protein species and the highest microbial activity were also detected.Low Al^3+concentrations(<10 mg/L)could promote the removal efficiencies of COD and TN,yet excessive Al^3+levels(>10 mg/L)weakened microbial activity.Higher Al^3+concentrations(>30 mg/L)also inhibited the release of phosphorus in the anaerobic zone by reacting with PO4^3-.

关 键 词：Extracellular polymeric substances Activated sludge Aluminum ion A^2O WASTEWATER 

分 类 号：X70[环境科学与工程—环境工程]