title: Anodic oxidation process for the degradation of 2, 4-dichlorophenol in aqueous solution and the enhancement of biodegradability.
abstract: Degradation of 2, 4-dichlorophenol (2, 4-DCP) in aqueous media by anodic oxidation using Ti-based oxide electrode has been studied. Additionally, the influence of anodic oxidation on the biodegradability of 2, 4-DCP solution was investigated. It was found that alkaline media was suitable for the anodic oxidation of 2, 4-DCP, while acidic media tended to cause more 2, 4-DCP volatizing. The poor degradation of 2, 4-DCP was ascribed to the direct anodic oxidation at lower anodic potential, while the indirect anodic oxidation was responsible for the better degradation at higher anodic potential with a high power consumption. The variation of COD and the characteristic of UV-vis spectra indicated that some organic intermediates were produced during the course of the degradation of 2, 4-DCP. The obvious inhibition of microbial activity was observed when 2, 4-DCP concentration was about 100 mg/L. The anodic oxidation process was able to enhance the biodegradability of 2, 4-DCP solution and this enhancement became greater with the extension of anodic oxidation treatment. This work suggests that the anodic oxidation with the Ti/IrO(2)/RuO(2)/TiO(2) electrode generally applied in chemical industry is a promising alternative for the pretreatment of the wastewaters containing chlorophenols.
authors.affiliation: School of Environment and Safety Engineering, Qingdao University of Science and Technology, Shandong, Qingdao 266042, China. cyyf200611@qust.edu.cn
authors.forename: Yan-Yang
authors.initials: YY
authors.lastname: Chu
authors.forename: Wei-Jing
authors.initials: WJ
authors.lastname: Wang
authors.forename: Meng
authors.initials: M
authors.lastname: Wang
mesh_terms: D015084:2,4-Dichlorophenoxyacetic Acid / Q000378:metabolism*; D004566:Electrodes; D006540:Herbicides / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D008855:Microscopy, Electron, Scanning; D010084:Oxidation-Reduction; D012996:Solutions; D013056:Spectrophotometry, Ultraviolet; D014867:Water
chemical_list: D006540:Herbicides; D012996:Solutions; D014867:Water; D015084:2,4-Dichlorophenoxyacetic Acid