title: Advanced treatment of wet-spun acrylic fiber manufacturing wastewater using three-dimensional electrochemical oxidation.
abstract: A three-dimensional electrochemical oxidation (3D-EC) reactor with introduction of activated carbon (AC) as particle micro-electrodes was applied for the advanced treatment of secondary wastewater effluent of a wet-spun acrylic fiber manufacturing plant. Under the optimized conditions (current density of 500A/m2, circulation rate of 5mL/min, AC dosage of 50g, and chloride concentration of 1.0g/L), the average removal efficiencies of chemical oxygen demand (CODcr), NH3-N, total organic carbon (TOC), and ultraviolet absorption at 254nm (UV254) of the 3D-EC reactor were 64.5%, 60.8%, 46.4%, and 64.8%, respectively; while the corresponding effluent concentrations of CODcr, NH3-N, TOC, and UV254were 76.6, 20.1, and 42.5mg/L, and 0.08Abs/cm, respectively. The effluent concentration of CODcrwas less than 100mg/L, which showed that the treated wastewater satisfied the demand of the integrated wastewater discharge standard (GB 8978-1996). The 3D-EC process remarkably improved the treatment efficiencies with synergistic effects for CODcr, NH3-N, TOC, and UV254during the stable stage of 44.5%, 38.8%, 27.2%, and 10.9%, respectively, as compared with the sum of the efficiencies of a two-dimensional electrochemical oxidation (2D-EC) reactor and an AC adsorption process, which was ascribed to the numerous micro-electrodes of AC in the 3D-EC reactor. Gas chromatography mass spectrometry (GC-MS) analysis revealed that electrochemical treatment did not generate more toxic organics, and it was proved that the increase in acute biotoxicity was caused primarily by the production of free chlorine.
authors.affiliation: Department of Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China. Electronic address: skytal_03@sina.com.
authors.forename: Tianlong
authors.initials: T
authors.lastname: Zheng
authors.affiliation: Department of Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; Beijing Key Laboratory on Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, China. Electronic address: wangqh59@sina.com.
authors.forename: Qunhui
authors.initials: Q
authors.lastname: Wang
authors.affiliation: School of Earth and Environmental Sciences, The University of Adelaide, South Australia 5005, Australia.
authors.forename: Zhining
authors.initials: Z
authors.lastname: Shi
authors.affiliation: Department of Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Fang
authors.affiliation: Department of Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China.
authors.forename: Shanshan
authors.initials: S
authors.lastname: Shi
authors.affiliation: Department of Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China.
authors.forename: Juan
authors.initials: J
authors.lastname: Wang
authors.affiliation: Department of Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China.
authors.forename: Chuanfu
authors.initials: C
authors.lastname: Wu
mesh_terms: D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D055664:Electrochemical Techniques; D010084:Oxidation-Reduction; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Advanced treatment; Synergistic effect; Three-dimensional electrochemical oxidation; Wet-spun acrylic fiber wastewater