title: Effect of continuously dosing Cu(II) on pollutant removal and soluble microbial products in a sequencing batch reactor.
abstract: The effects of synthetic wastewater that contained 20 mg/L Cu(II) on the removal of organic pollutants in a sequencing batch reactor were investigated. Results of continuous 20 mg/L Cu(II) exposure for 120 days demonstrated that the chemical oxygen demand (COD) removal efficiency decreased to 42% initially, followed by a subsequent gradual recovery, which peaked at 78% by day 97. Effluent volatile fatty acid (VFA) concentration contributed 67 to 89% of the influent COD in the experimental reactor, which indicated that the degradation of the organic substances ceased at the VFA production step. Meanwhile, the varieties of soluble microbial products (SMP) content and main components (protein, polysaccharide, and DNA) were discussed to reveal the response of activated sludge to the toxicity of 20 mg/L Cu(II). The determination of Cu(II) concentrations in extracellular polymeric substances (EPS) and SMP throughout the experiment indicated an inverse relationship between extracellular Cu(II) concentration and COD removal efficiency.
authors.affiliation: Department of Environmental Science and Engineering, Fudan University, 220 Handan Road, Shanghai 200433, China E-mail: liuyan@fudan.edu.cn.
authors.forename: YangWei
authors.initials: Y
authors.lastname: Yan
authors.affiliation: Department of Environmental Science and Engineering, Fudan University, 220 Handan Road, Shanghai 200433, China E-mail: liuyan@fudan.edu.cn.
authors.forename: YuWen
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Environmental Science and Engineering, Fudan University, 220 Handan Road, Shanghai 200433, China E-mail: liuyan@fudan.edu.cn.
authors.forename: Yan
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Department of Environmental Science and Engineering, Fudan University, 220 Handan Road, Shanghai 200433, China E-mail: liuyan@fudan.edu.cn.
authors.forename: Xiang
authors.initials: X
authors.lastname: Liu
authors.affiliation: Department of Environmental Science and Engineering, Fudan University, 220 Handan Road, Shanghai 200433, China E-mail: liuyan@fudan.edu.cn.
authors.forename: ChenChao
authors.initials: C
authors.lastname: Yao
authors.affiliation: College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
authors.forename: LuMing
authors.initials: L
authors.lastname: Ma
mesh_terms: D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D019327:Copper Sulfate / Q000737:chemistry / Q000633:toxicity*; D005232:Fatty Acids, Volatile / Q000032:analysis; D015386:Hazardous Substances / Q000032:analysis / Q000737:chemistry; D017672:Nitrogen Compounds / Q000032:analysis / Q000737:chemistry; D011506:Proteins / Q000032:analysis; D062065:Wastewater / Q000032:analysis / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D019327:Copper Sulfate; D005232:Fatty Acids, Volatile; D015386:Hazardous Substances; D017672:Nitrogen Compounds; D011506:Proteins; D062065:Wastewater; D014874:Water Pollutants, Chemical