Effective advance treatment of secondary effluent from industrial parks by the Mn-based catalyst ozonation process  

作　　者：Zhijuan Niu Shihao Han Weihua Qin Pan Gao Feng Xiao Shaoxia Yang 

机构地区：[1]School of Water Resources and Hydropower Engineering,North China Electric Power University,Beijing 102206,China [2]Research Center for Eco-Environmental Engineering,Dongguan University of Technology,Dongguan 523808,China [3]CCCC Highway Consultants Co.,Ltd.,Beijing 100010,China [4]National Engineering Laboratory for Biomass Power Generation Equipment,School of Renewable Energy,North China Electric Power University,Beijing 102206,China

出　　处：《Frontiers of Environmental Science & Engineering》2024年第10期89-101,共13页环境科学与工程前沿（英文）

基　　金：supported by the National Natural Science Foundation of China(No.U22A20241).

摘　　要：Catalytic ozonation is a potential technology to eliminate refractory organic contaminants with the low concentration in secondary effluent from industrial park wastewater treatment plants(IPWWTPs).In this study,the catalytic ozonation over the Mn-based catalyst significantly improved the chemical oxygen demand(COD),total organic carbon(TOC),and UV254 removals of secondary effluent from IPWWTPs.The Mn-based catalyst/Og system achieved 84.8%,69.8%,and 86.4% removals of COD,TOC,and UY254,which were 3.3,5.7,and 1.1 times that in ozonation alone,respectively.Moreover,the Mn-based catalytic ozonation process exhibited excellent pH tolerance ranging from pH 4.0 to 9.0.Additionally,the depth analysis based on fluorescence excitation-emission matrix(EEM)confirmed that the catalytic ozonation process preferred to degrade toxic aromatic hydrocarbons.The existence of the Mn-based catalyst/O_(3) system enhanced 21.4%-38.3% more fluorescent organic matters removal,compared to that in ozonation alone.Mechanistic studies proved that the abundant Lewis acid sites(Mn/Mn(n+1)+and adsorbed oxygen)on the surface of the Mn-based catalyst effectively promoted O_(3) decomposition into reactive oxygen species(ROS),and-O_(2)-/HO_(2):and ^(1)O_(2) were the main ROS for degrading refractory organic contaminants.The contributions of ROS oxidation(91.2%)was much higher than that of direct O_(3) oxidation(8.8%).Thus,this work provides an effective advanced treatment process for purifying secondary effluent from IPWWTPs.

关 键 词：Catalytic ozonation Mn-based catalyst Secondary effluent Industrial park wastewater 

分 类 号：X703[环境科学与工程—环境工程]