Optimization of Fenton pretreatment for 2-chlorophenol solution

作     者：贺仲兵 刘云国 肖玉 

作者机构：College of Environmental Science and EngineeringHunan University Key Laboratory of Environmental Biology and Pollution ControlMinistry of Education (Hunan University) Department of ChemistryKaili University 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2013年第20卷第10期

页      面：2791-2795页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：Project(11JJ2031) supported by the Natural Science Fund of Hunan Province China 

主　　题：2-chlorophenol Fenton-biological coupled system dechlorination sequencing batch reactor(SBR) biodegradability 

摘      要：Fenton oxidation was used as the pretreatment of 2-chlorophenol wastewater with the objective of dechlorination, as it was considered that after breakage of aryl—Cl bond, the generated intermediates may be easily biodegraded. Hence, the optimization of pH and the low Fenton reagent doses for dechlorination was investigated. More than 99% dechlorination is obtained at the optimal pH 4 and the Fenton reagent doses of 86 mmol/L H2 O2 and 2.87 mmol/L Fe2+. The corresponding 2-chlorophenol is degraded completely, 80.02% COD is also removed, and the biodegradability, evaluated in terms of the BOD5 /COD ratio, is increased up to 0.41. To test the effect of this pretreatment, the pretreated 2-chlorophenol wastewater was fed to a sequencing batch reactor(SBR). The results show that complete mineralization is achieved. It is demonstrated that, for the treatment of recalcitrant compounds like 2-chlorophenol, the Fenton pretreatment could be quite effective and economical for enhancing the biodegradability in a Fenton-biological coupled system.