Atrazine manufacturing wastewater treatment by photocatalytic ozonization with activated carbon supported ferric iron
WEN Diya1,2,, CHEN Bing1,3,,, ZHENG Jisi3, ZENG Ganning4 1.Key Laboratory of Regional Energy and Environmental Systems Optimization, Ministry of Education, North China Electric Power University, Beijing 102206, China 2.Shenzhen Key Lab of Coastal Ocean Dynamics and Environmental Evolution, Division of Marine Science and Technology, Tsinghua Shenzhen Graduate School, Shenzhen 518055, China 3.Northern Region Persistent Organic Pollution Control (NRPOP) Laboratory, Memorial University of Newfoundland, Saint John A1B 3X5, Canada 4.Ocean College, Zhejiang University of Technology, Hangzhou 310014, China
Abstract:Atrazine is a kind of widely used herbicide, its manufacturing wastewater was characterized as high concentration of organic compounds and high salinity, which causes difficulty in treatment. In this study, a catalyst of activated carbon supported ferric iron (AC-Fe3+) was developed for the photocatalytic ozonization of atrazine manufacturing wastewater, and its performance was evaluated. The effects of catalyst dosage, UV power, and aeration intensity on the degradation of COD and NH3-N were investigated, and the degradation mechanism and adsorption-degradation kinetics of the photocatalytic oxidation system were also analyzed. The results showed that the degradation effect was significantly improved by the photocatalytic oxidation system with AC-Fe3+, which could effectively mitigate the adverse effects of high salinity on the treatment process. Under the treatment conditions of catalyst dosage of 40 g·L?1, UV power of 14 w, and aeration intensity of 800 L·h?1, the removal rates of COD and NH3-N could reach 70.9% and 87.7%, respectively. The findings would provide a new approach for high efficient treatment of high-salinity and high organic loading industry wastewater. Key words:atrazine manufacturing wastewater/ photocatalytic ozonization/ high salinity/ hydroxyl radical/ activated carbon supported catalyst.
图1石英壁内紫外灯排布方式俯视图与光催化氧化降解实验装置示意图 Figure1.Arrangement style of UV lamp in vertical view and scheme of photocatalytic oxidation degradation device
图3不同紫外灯功率下UV/AC-Fe3+、UV/O3和UV/O3/AC-Fe3+体系对莠去津废水COD去除率比较 Figure3.Comparison of COD removal rates of atrazine wastewater by UV/AC-Fe3+, UV/O3 and UV/O3/AC-Fe3+ systems under different UV power
图7莠去津废水在不同因素水平下ln(C0/Ct)与t的关系以及不同因素水平与k之间的拟合曲线 Figure7.Relationships between ln(C0/Ct) and t and the fitting curve between different levels and k at different levels of each factor
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1.Key Laboratory of Regional Energy and Environmental Systems Optimization, Ministry of Education, North China Electric Power University, Beijing 102206, China 2.Shenzhen Key Lab of Coastal Ocean Dynamics and Environmental Evolution, Division of Marine Science and Technology, Tsinghua Shenzhen Graduate School, Shenzhen 518055, China 3.Northern Region Persistent Organic Pollution Control (NRPOP) Laboratory, Memorial University of Newfoundland, Saint John A1B 3X5, Canada 4.Ocean College, Zhejiang University of Technology, Hangzhou 310014, China Received Date: 2019-04-03 Accepted Date: 2019-09-11 Available Online: 2020-03-02 Keywords:atrazine manufacturing wastewater/ photocatalytic ozonization/ high salinity/ hydroxyl radical/ activated carbon supported catalyst Abstract:Atrazine is a kind of widely used herbicide, its manufacturing wastewater was characterized as high concentration of organic compounds and high salinity, which causes difficulty in treatment. In this study, a catalyst of activated carbon supported ferric iron (AC-Fe3+) was developed for the photocatalytic ozonization of atrazine manufacturing wastewater, and its performance was evaluated. The effects of catalyst dosage, UV power, and aeration intensity on the degradation of COD and NH3-N were investigated, and the degradation mechanism and adsorption-degradation kinetics of the photocatalytic oxidation system were also analyzed. The results showed that the degradation effect was significantly improved by the photocatalytic oxidation system with AC-Fe3+, which could effectively mitigate the adverse effects of high salinity on the treatment process. Under the treatment conditions of catalyst dosage of 40 g·L?1, UV power of 14 w, and aeration intensity of 800 L·h?1, the removal rates of COD and NH3-N could reach 70.9% and 87.7%, respectively. The findings would provide a new approach for high efficient treatment of high-salinity and high organic loading industry wastewater.
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