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UV-catalytic treatment of spent caustic from ethene plant with hydrogen peroxide and ozone oxidation
Authors:Yu Zheng-zhe  Sun De-zhi  Li Chang-hai  Shi Peng-fei  Duan Xiao-dong  Sun Guo-rong  Liu Jun-xin
Affiliation:1. Research Center for Ecg-Environmental Sciences, CAS, Beijing 100085, China;Department of Environmental Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
2. Department of Environmental Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
3. Research Center for Ecg-Environmental Sciences, CAS, Beijing 100085, China
Abstract:The performance of UV/H 2O 2, UV/O 3 and UV/H 2O 2/O 3 oxidation systems for treating spent caustic from an ethylene plant was investigated. In UV/H 2O 2 system, with the increase of H 2O 2 dosage, removal efficiencies of COD and the ratio of biochemical oxygen demand(BOD) to chemical oxygen demand(COD) of the effluent were increased and a better performance was obtained than the H 2O 2 system alone. In UV/H 2O 2 system, removal efficiency of COD reach 68% under the optimum condition, and BOD/COD ratio was significantly increased from 0 22 to 0 52. In UV/O 3 system, with the increase of O 3 dosage, removal efficiency of COD and BOD/COD ratio were increased, and a better performance was obtained than the O 3 system alone. Under the optimum condition, removal efficiency of COD was 54%, and BOD/COD ratio was significantly increased from 0 22 to 0 48. In UV/H 2O 2/O 3 system, COD removal efficiency was found to be 22.0% higher than UV/O 3 system.
Keywords:spent caustic  photochemical oxidation  UV/O 3 system  UV/H 2O 2 system  UV/H 2O 2/O 3 system  
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