title: Potential effects of loading nano zero valent iron discharged on membrane fouling in an anoxic/oxic membrane bioreactor.
abstract: A laboratory-scale submerged anoxic-oxic membrane bioreactor for municipal wastewater was operated to investigate the potential effects of loading suspended nano zero valent iron (nZVI, 25 and 50 mg/L) discharged on the membrane fouling. nZVI transformed rapidly into Fen+, generated reactive oxygen species (ROS) and caused oxidative stress. This result rapidly led to the cell lysis and bacteria death, and further resulted in the decrease of biomass and extracellular polymeric substances (EPS). nZVI also thinned the membrane fouling layer. But nZVI had no obvious effects on activated sludge particle size, EPS molecule weight distribution and VOCs constitution of membrane foulant. Additionally, nZVI released Fen+and mitigated the inorganic (mainly Si element) fouling through Fen+flocculation. Consequently, membrane fouling mitigation with nZVI discharged was mainly due to oxidative stress to bacteria and Fen+flocculation of nZVI.
authors.affiliation: State Environmental Protection Key Laboratory of Drinking Water Source Management and Technology, Shenzhen Key Laboratory of Drinking Water Source Safety Control, Shenzhen Key Laboratory of Emerging Contaminants Detection & Control in Water Environment, Shenzhen Academy of Environmental Sciences, Guangdong Shenzhen 518001, China; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
authors.forename: Lijie
authors.initials: L
authors.lastname: Zhou
authors.affiliation: Department of Civil and Environmental Engineering, University of Auckland, Auckland 1142, New Zealand.
authors.forename: Weiqin
authors.initials: W
authors.lastname: Zhuang
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Wang
authors.affiliation: School of Environment and Energy, Peking University Shenzhen Graduate School, Guangdong Shenzhen 518055, China.
authors.forename: Ke
authors.initials: K
authors.lastname: Yu
authors.affiliation: Shenzhen Municipal Design & Research Institute Co., Ltd, 3007 West Sungang Road, Guangdong Shenzhen 518029, China.
authors.forename: Shufang
authors.initials: S
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China. Electronic address: siqingxia@gmail.com.
authors.forename: Siqing
authors.initials: S
authors.lastname: Xia
mesh_terms: D001419:Bacteria / Q000378:metabolism; D019149:Bioreactors / Q000382:microbiology*; D007501:Iron / Q000378:metabolism*; D008567:Membranes, Artificial; D012722:Sewage / Q000382:microbiology
chemical_list: D008567:Membranes, Artificial; D012722:Sewage; D007501:Iron
keywords: Membrane bioreactor; Membrane fouling; Nano zero valent iron (nZVI); Reactive oxygen species