title: Coagulation-flocculation as pre-treatment for micro-scale Fe/Cu/O3process (CF-mFe/Cu/O3) treatment of the coating wastewater from automobile manufacturing.
abstract: A coagulation-flocculation as pre-treatment combined with mFe/Cu/O3(CF-mFe/Cu/O3) process was developed to degrade the pollutants in automobile coating wastewater (ACW). In coagulation-flocculation (CF) process, high turbidity removal efficiency (97.1%) and low COD removal efficiency (10.5%) were obtained under the optimal conditions using Al2(SO4)3·18H2O and CaO. The effluent of CF process (ECF) was further disposed by mFe/Cu/O3process, and its key operating parameters were optimized by batch experiments. Optimally, COD removal efficiency of ECF obtained by the mFe/Cu/O3process (i.e., 87.6% after 30 min treatment) was much higher than those of mFe/Cu alone (8.3%), ozone alone (46.6%), and mFe/Cu/air (6.1%), which confirms the superiority of the mFe/Cu/O3process. In addition, the analysis results of UV-vis, excitation-emission matrix (EEM) fluorescence spectra and GC/MS further confirm that the phenol pollutants of ECF had been effectively decomposed or transformed after CF-mFe/Cu/O3process treatment. Meanwhile, B/C ratio of ACW increased from 0.19 to 0.56, which suggests the biodegradability was improved significantly. Finally, the operating cost of CF-mFe/Cu/O3process was about 1.83 USD t-1for ACW treatment. Therefore, the combined process is a promising treatment technology for the coating wastewater from automobile manufacturing.
authors.affiliation: Department of Environmental Science and Engineering, School of Architecture and Environment, Sichuan University, Chengdu 610065, China.
authors.forename: Zhaokun
authors.initials: Z
authors.lastname: Xiong
authors.affiliation: Department of Environmental Science and Engineering, School of Architecture and Environment, Sichuan University, Chengdu 610065, China.
authors.forename: Jinyan
authors.initials: J
authors.lastname: Cao
authors.affiliation: Department of Environmental Science and Engineering, School of Architecture and Environment, Sichuan University, Chengdu 610065, China.
authors.forename: Dan
authors.initials: D
authors.lastname: Yang
authors.affiliation: Department of Environmental Science and Engineering, School of Architecture and Environment, Sichuan University, Chengdu 610065, China. Electronic address: laibo@scu.edu.cn.
authors.forename: Bo
authors.initials: B
authors.lastname: Lai
authors.affiliation: Department of Environmental Science and Engineering, School of Architecture and Environment, Sichuan University, Chengdu 610065, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Yang
mesh_terms: D001336:Automobiles; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D002244:Carbon / Q000737:chemistry; D004785:Environmental Pollutants / Q000737:chemistry; D005427:Flocculation; D008401:Gas Chromatography-Mass Spectrometry; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste / Q000032:analysis*; D007501:Iron / Q000737:chemistry; D066192:Manufacturing Industry; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D010126:Ozone / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D002244:Carbon; D004785:Environmental Pollutants; D007220:Industrial Waste; D007501:Iron; D010100:Oxygen; D010126:Ozone; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Automobile coating wastewater; Catalytic ozonation; Coagulation-flocculation; mFe/Cu/O(3) process