title: Accelerating biodegradation of a monoazo dye Acid Orange 7 by using its endogenous electron donors.
abstract: Biodegradation of a monoazo dye - Acid Orange 7 (AO7) was investigated by using an internal circulation baffled biofilm reactor. For accelerating AO7 biodegradation, endogenous electron donors produced from AO7 by UV photolysis were added into the reactor. The result shows that AO7 removal rate can be accelerated by using its endogenous electron donors, such as sulfanilic and aniline. When initial AO7 concentration was 13.6mg/L, electron donors generated by 8h UV photolysis were added into the same system. The biodegradation rate 0.4mg0.05h-1was enhanced 60% than that without adding electron donor. Furthermore, sulfanilic and aniline were found to be the main endogenous electron carriers, which could accelerate the steps of the azo dye biodegradation.
authors.affiliation: Department of Environmental Science and Engineering, College of Life and Environmental Sciences, Shanghai Normal University, Shanghai, 200234, PR China. Electronic address: swh@shnu.edu.cn.
authors.forename: Weihua
authors.initials: W
authors.lastname: Sun
authors.affiliation: Department of Environmental Science and Engineering, College of Life and Environmental Sciences, Shanghai Normal University, Shanghai, 200234, PR China.
authors.forename: Chengji
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Department of Environmental Science and Engineering, College of Life and Environmental Sciences, Shanghai Normal University, Shanghai, 200234, PR China.
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
authors.affiliation: Department of Environmental Science and Engineering, College of Life and Environmental Sciences, Shanghai Normal University, Shanghai, 200234, PR China.
authors.forename: Bingbing
authors.initials: B
authors.lastname: Zhang
authors.affiliation: Department of Environmental Science and Engineering, College of Life and Environmental Sciences, Shanghai Normal University, Shanghai, 200234, PR China.
authors.forename: Hongzhuan
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Department of Environmental Science and Engineering, College of Life and Environmental Sciences, Shanghai Normal University, Shanghai, 200234, PR China. Electronic address: zhym@shnu.edu.cn.
authors.forename: Yongming
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: School of Environment, Tsinghua University, Beijing 100084, PR China.
authors.forename: Lujun
authors.initials: L
authors.lastname: Chen
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D001391:Azo Compounds / Q000032:analysis* / Q000737:chemistry / Q000528:radiation effects; D001420:Bacteria, Aerobic / Q000254:growth & development; D001557:Benzenesulfonates / Q000032:analysis* / Q000737:chemistry / Q000528:radiation effects; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D004579:Electron Transport; D010782:Photolysis; D013425:Sulfanilic Acids / Q000737:chemistry*; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry / Q000528:radiation effects; D018508:Water Purification / Q000379:methods*
chemical_list: D000814:Aniline Compounds; D001391:Azo Compounds; D001557:Benzenesulfonates; D013425:Sulfanilic Acids; D014874:Water Pollutants, Chemical; C014722:2-naphthol orange; C023650:aniline
keywords: Acceleration; Azo dye; Biodegradation; Endogenous electron donor; UV photolysis