title: Improvement in carbofuran degradation by different Fenton's reagent dosing processes.
abstract: Attempts were made in this study to examine the efficiency of Fenton's reagent with different dosing processes and H(2)O(2) and Fe(2+) concentrations for the treatment of carbofuran wastewater. Carbofuran degradation, total organic carbon (TOC) removal and H(2)O(2) consumption were determined during the experiments. Increases in H(2)O(2) and Fe(2+) concentrations led to an increase in the degradation of carbofuran. Almost 100% of carbofuran could be degraded at pH 3, 120 mg L(-1) H(2)O(2), 24 mg L(-1) Fe(2+) and 30 minutes reaction time; removals of TOC were among 48.8%-53.3% under different dosing processes. A continuous dosing process was beneficial to improve the removal of TOC by Fenton's reagent. Rate constants of carbofuran degradation could be calculated by the first-order kinetics; increase in the Fenton's reagent generally increased the rate constants. Gas chromatography-mass spectrometry analysis found five degradation products by hydroxyl radicals attack. Thus, this study might offer an effective dosing way for carbofuran wastewater treatment by Fenton's reagent.
authors.affiliation: Department of Environmental Engineering and Health, Yuanpei University, Hsinchu, Taiwan. ysma0728@mail.ypu.edu.tw
authors.forename: Ying-Shih
authors.initials: YS
authors.lastname: Ma
mesh_terms: D002235:Carbofuran / Q000737:chemistry*; D004787:Environmental Pollution / Q000517:prevention & control; D008401:Gas Chromatography-Mass Spectrometry; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007306:Insecticides / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: C045076:Fenton's reagent; D007306:Insecticides; D014874:Water Pollutants, Chemical; D006861:Hydrogen Peroxide; D007501:Iron; D002235:Carbofuran