title: Advanced oxidation removal of hypophosphite by O3/H2O2combined with sequential Fe(II) catalytic process.
abstract: Elimination of hypophosphite (HP) was studied as an example of nickel plating effluents treatment by O3/H2O2and sequential Fe(II) catalytic oxidation process. Performance assessment performed with artificial HP solution by varying initial pH and employing various oxidation processes clearly showed that the O3/H2O2─Fe(II) two-step oxidation process possessed the highest removal efficiency when operating under the same conditions. The effects of O3dosing, H2O2concentration, Fe(II) addition and Fe(II) feeding time on the removal efficiency of HP were further evaluated in terms of apparent kinetic rate constant. Under improved conditions (initial HP concentration of 50 mg L-1, 75 mg L-1O3, 1 mL L-1H2O2, 150 mg L-1Fe(II) and pH 7.0), standard discharge (<0.5 mg L-1in China) could be achieved, and the Fe(II) feeding time was found to be the limiting factor for the evolution of apparent kinetic rate constant in the second stage. Characterization studies showed that neutralization process after oxidation treatment favored the improvement of phosphorus removal due to the formation of more metal hydroxides. Moreover, as a comparison with lab-scale Fenton approach, the O3/H2O2─Fe(II) oxidation process had more competitive advantages with respect to applicable pH range, removal efficiency, sludge production as well as economic costs.
authors.affiliation: School of Civil and Environment Engineering, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, 518055, China.
authors.forename: Zilong
authors.initials: Z
authors.lastname: Zhao
authors.affiliation: School of Civil and Environment Engineering, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, 518055, China; Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Shenzhen, 518055, China.
authors.forename: Wenyi
authors.initials: W
authors.lastname: Dong
authors.affiliation: School of Civil and Environment Engineering, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, 518055, China; Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Shenzhen, 518055, China. Electronic address: whj1533@qq.com.
authors.forename: Hongjie
authors.initials: H
authors.lastname: Wang
authors.affiliation: School of Civil and Environment Engineering, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, 518055, China.
authors.forename: Guanhan
authors.initials: G
authors.lastname: Chen
authors.affiliation: School of Civil and Environment Engineering, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, 518055, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.affiliation: School of Civil and Environment Engineering, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, 518055, China.
authors.forename: Zekun
authors.initials: Z
authors.lastname: Liu
authors.affiliation: School of Civil and Environment Engineering, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, 518055, China.
authors.forename: Yaguang
authors.initials: Y
authors.lastname: Gao
authors.affiliation: School of Civil and Environment Engineering, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, 518055, China.
authors.forename: Beili
authors.initials: B
authors.lastname: Zhou
mesh_terms: D002384:Catalysis; D002681:China; D005296:Ferrous Compounds / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000737:chemistry; D008669:Metallurgy; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry; D010721:Phosphinic Acids / Q000737:chemistry*; D012722:Sewage; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D005296:Ferrous Compounds; D010721:Phosphinic Acids; D012722:Sewage; D014874:Water Pollutants, Chemical; D010126:Ozone; D006861:Hydrogen Peroxide
keywords: Advanced oxidation process; Comparison; Hypophosphite; Nickel plating effluents; Ozone