title: Transformation characteristics of refractory pollutants in plugboard wastewater by an optimal electrocoagulation and electro-Fenton process.
abstract: The treatment of the plugboard wastewater was performed by an optimal electrocoagulation and electro-Fenton. The organic components with suspended fractions accounting for 30% COD were preferably removed via electrocoagulation at initial 5 min. In contrast, the removal efficiency was increased to 76% with the addition of H(2)O(2). The electrogenerated Fe(2+) reacts with H(2)O(2) and leads to the generation of (·)OH, which is responsible for the higher COD removal. However, overdosage H(2)O(2) will consume (·)OH generated in the electro-Fenton process and lead to the low COD removal. The COD removal efficiency decreased with the increased pH. The concentration of Fe(2+) ions was dependent on the solution pH, H(2)O(2) dosage and current density. The changes of organic characteristics in coagulation and oxidation process were differenced and evaluated using gel permeation chromatography, fluorescence excitation-emission scans and Fourier transform infrared spectroscopy. The fraction of the wastewater with aromatic structure and large molecular weight was decomposed into aliphatic structure and small molecular weight fraction in the electro-Fenton process.
authors.affiliation: State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China.
authors.forename: Xu
authors.initials: X
authors.lastname: Zhao
authors.forename: Baofeng
authors.initials: B
authors.lastname: Zhang
authors.forename: Huijuan
authors.initials: H
authors.lastname: Liu
authors.forename: Fayuan
authors.initials: F
authors.lastname: Chen
authors.forename: Angzhen
authors.initials: A
authors.lastname: Li
authors.forename: Jiuhui
authors.initials: J
authors.lastname: Qu
mesh_terms: D057919:Biological Oxygen Demand Analysis; D004560:Electricity; D059029:Electronic Waste / Q000032:analysis*; D006861:Hydrogen Peroxide; D017665:Hydroxyl Radical / Q000032:analysis / Q000737:chemistry; D007220:Industrial Waste / Q000032:analysis; D007501:Iron; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: C045076:Fenton's reagent; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D017665:Hydroxyl Radical; D006861:Hydrogen Peroxide; D007501:Iron