title: Application of three tailing-based composites in treating comprehensive electroplating wastewater.
abstract: Heavy metals and chemical oxygen demand (COD) are major challenging pollutants for most electroplating wastewater treatment plants. A novel composite material, prepared with a mixture of calcium and sodium compounds and tailings, was simply mixed by ratios and used to treat a comprehensive electroplating wastewater with influent COD, total copper (T-Cu), and total nickel (T-Ni) respectively as 690, 4.01, and 20.60 mg/L on average. Operational parameters, i.e. the contact time, pH, mass ratio of calcium and sodium compounds and tailings, were optimized as 30 min, 10.0, and 4:2:1. Removal rates for COD, T-Cu, and T-Ni could reach 71.8, 90.5, and 98.1%, respectively. No significant effect of initial concentrations on removal of T-Cu and T-Ni was observed for the composite material. The adsorption of Cu(II) and Ni(II) on the material fitted Langmuir and Freundlich isotherms respectively. Weight of waste sludge from the calcium/sodium-tailing system after reaction was 10% less than that from the calcium-tailing system. The tailing-based composite is cost-effective in combating comprehensive electroplating pollution, which shows a possibility of applying the tailings in treating electroplating wastewater.
authors.affiliation: School of Environment and Architecture, University of Shanghai for Science and Technology, 200093 Shanghai, China E-mail: Liuhb@usst.edu.cn.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Liu
authors.affiliation: School of Environment and Architecture, University of Shanghai for Science and Technology, 200093 Shanghai, China E-mail: Liuhb@usst.edu.cn.
authors.forename: Mengling
authors.initials: M
authors.lastname: Zhu
authors.affiliation: School of Environment and Architecture, University of Shanghai for Science and Technology, 200093 Shanghai, China E-mail: Liuhb@usst.edu.cn.
authors.forename: Saisai
authors.initials: S
authors.lastname: Gao
mesh_terms: D000327:Adsorption; D057919:Biological Oxygen Demand Analysis; D003300:Copper / Q000302:isolation & purification; D004595:Electroplating; D006863:Hydrogen-Ion Concentration; D019216:Metals, Heavy / Q000302:isolation & purification; D009532:Nickel / Q000302:isolation & purification; D012722:Sewage; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods*
chemical_list: D003300:Copper; D019216:Metals, Heavy; D009532:Nickel; D012722:Sewage; D062065:Wastewater; D014874:Water Pollutants, Chemical