UV-catalytic treatment of spent caustic from ethene plant with hydrogen peroxide and ozone oxidation.
The performance of UV/H2O2, UV/O3 and UV/H2O2/O3 oxidation systems for treating spent caustic from an ethylene plant was investigated. In UV/H2O2 system, with the increase of H2O2 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 H2O2 system alone. In UV/H2O2 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/O3 system, with the increase of O3 dosage, removal efficiency of COD and BOD/COD ratio were increased, and a better performance was obtained than the O3 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/H2O2/O3 system, COD removal efficiency was found to be 22.0% higher than UV/O3 system.
Yu
Zheng-zhe
ZZ
Research Center for Eco-Environmental Sciences, CAS, Beijing 100085, China. yuzhengzhe2002@sohu.com
Sun
De-zhi
DZ
Li
Chang-hai
CH
Shi
Peng-fei
PF
Duan
Xiao-dong
XD
Sun
Guo-rong
GR
Liu
Jun-xin
JX
D002424:Caustics / Q000737:chemistry*; D005030:Ethylenes; D008401:Gas Chromatography-Mass Spectrometry; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007700:Kinetics; D010083:Oxidants, Photochemical / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry*; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*
D002424:Caustics; D005030:Ethylenes; D010083:Oxidants, Photochemical; D010126:Ozone; C036216:ethylene; D006861:Hydrogen Peroxide