title: Advanced treatment of biologically pretreated coal gasification wastewater by a novel heterogeneous Fenton oxidation process.
abstract: Sewage sludge from a biological wastewater treatment plant was converted into sewage sludge based activated carbon (SBAC) with ZnCl2 as activation agent, which was used as a support for ferric oxides to form a catalyst (FeOx/SBAC) by a simple impregnation method. The new material was then used to improve the performance of Fenton oxidation of real biologically pretreated coal gasification wastewater (CGW). The results indicated that the prepared FeOx/SBAC significantly enhanced the pollutant removal performance in the Fenton process, so that the treated wastewater was more biodegradable and less toxic. The best performance was obtained over a wide pH range from 2 to 7, temperature 30°C, 15 mg/L of H2O2 and 1g/L of catalyst, and the treated effluent concentrations of COD, total phenols, BOD5 and TOC all met the discharge limits in China. Meanwhile, on the basis of significant inhibition by a radical scavenger in the heterogeneous Fenton process as well as the evolution of FT-IR spectra of pollutant-saturated FeOx/BAC with and without H2O2, it was deduced that the catalytic activity was responsible for generating hydroxyl radicals, and a possible reaction pathway and interface mechanism were proposed. Moreover, FeOx/SBAC showed superior stability over five successive oxidation runs. Thus, heterogeneous Fenton oxidation of biologically pretreated CGW by FeOx/SBAC, with the advantages of being economical, efficient and sustainable, holds promise for engineering application.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Haifeng
authors.initials: H
authors.lastname: Zhuang
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China. Electronic address: han13946003379@163.com.
authors.forename: Hongjun
authors.initials: H
authors.lastname: Han
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Wencheng
authors.initials: W
authors.lastname: Ma
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Baolin
authors.initials: B
authors.lastname: Hou
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Shengyong
authors.initials: S
authors.lastname: Jia
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhao
mesh_terms: D001673:Biodegradation, Environmental; D019149:Bioreactors; D002244:Carbon; D002384:Catalysis; D002712:Chlorides; D003031:Coal / Q000032:analysis*; D005290:Ferric Compounds; D007220:Industrial Waste / Q000032:analysis*; D018625:Microscopy, Atomic Force; D010084:Oxidation-Reduction; D012722:Sewage; D062065:Wastewater / Q000737:chemistry*; D017967:Zinc Compounds
chemical_list: D002244:Carbon; D002712:Chlorides; D003031:Coal; D005290:Ferric Compounds; D007220:Industrial Waste; D012722:Sewage; D062065:Wastewater; D017967:Zinc Compounds; C000499:ferric oxide; C016837:zinc chloride
keywords: Biodegradability; Biologically pretreated coal gasification wastewater; Catalyst; Heterogeneous Fenton oxidation; Mechanism