title: Enhanced biodegradation of triclosan by means of gamma irradiation.
abstract: Triclosan is an antimicrobial agent which has been frequently detected in the environment. In this paper, the biodegradation of triclosan after radiation-induced advanced oxidation was investigated. The results show that the removal efficiency of triclosan in the combined irradiation and biological treatment process ranged from 88% to 97%, depending on the absorbed dose, while it was only 54% in the single biological treatment process. The removal efficiency of total organic carbon (TOC) was in the range of 53.1%,-59.2% at dose of 1-5 kGy in the combined irradiation and biological treatment process. In comparison, the removal efficiency of TOC in the single biological treatment process was 24.5%, suggesting that irradiation can enhance the mineralization of triclosan. The dechlorination efficiency of triclosan ranged from 48.6% to 78.4% at dose of 1-5 kGy. The intermediates of triclosan degradation were tentatively identified by LC-MS analysis and the possible degradation pathway was proposed. Based on the above results, the combined irradiation and biological treatment process could be an alternative process for treating triclosan-containing wastewater.
authors.affiliation: Collaborative Innovation Center for Advanced Nuclear Energy Technology, INET, Tsinghua University, Beijing 100084, PR China; Beijing Key Laboratory of Radioactive Wastes Treatment, Tsinghua University, Beijing 100084, PR China.
authors.forename: Shizong
authors.initials: S
authors.lastname: Wang
authors.affiliation: Collaborative Innovation Center for Advanced Nuclear Energy Technology, INET, Tsinghua University, Beijing 100084, PR China; Beijing Key Laboratory of Radioactive Wastes Treatment, Tsinghua University, Beijing 100084, PR China.
authors.forename: Yanan
authors.initials: Y
authors.lastname: Yin
authors.affiliation: Collaborative Innovation Center for Advanced Nuclear Energy Technology, INET, Tsinghua University, Beijing 100084, PR China; Beijing Key Laboratory of Radioactive Wastes Treatment, Tsinghua University, Beijing 100084, PR China; State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing 100084, PR China. Electronic address: wangjl@tsinghua.edu.cn.
authors.forename: Jianlong
authors.initials: J
authors.lastname: Wang
mesh_terms: D000891:Anti-Infective Agents, Local; D001673:Biodegradation, Environmental; D002853:Chromatography, Liquid; D005720:Gamma Rays; D010084:Oxidation-Reduction; D014260:Triclosan / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: D000891:Anti-Infective Agents, Local; D014260:Triclosan; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Advanced oxidation process; Biodegradation; Irradiation; Mineralization; Triclosan