OPTIMIZATION OF ELECTROCHEMICAL OXIDATION FOR TREATING CHLOROBENZENE WASTE GAS BY RESPONSE SURFACE METHODOLOGY
Chlorinated volatile organic compounds(Cl-VOCs)such as chlorobenzenes,are difficult to remove from the environment because they are hydrophobic,volatile,and biotoxic.In this study,an electrochemical oxidation system was constructed to investigate the effect of a single factor,current density,electrode distance,and electrolyte concentration on the removal of chlorobenzene gas,using response surface methodology(RSM),and a prediction model by Design-Expert 10.0.1 software was established to optimize the reaction condition.The results of one-factor experiments showed that when treating 2.90 g/m3 chlorobenzene gas with 0.40 L/min flow rate,Ti/Ti4O7 as anode,stainless steel wire mesh as cathode,0.15 mol/L NaCl electrolyte,10.0 mA/cm2 current density and 4.0 cm electrode distance,and then the average removal efficiency(RE),efficiency capacity(EC)and energy consumption(Esp)was 57.99％,20.18 g/(m3 h)and 190.2 kW.h/kg,respectively.The results of RSM showed that current density had significant effect on RE,while the electrolyte concentration had the least effect;electrolyte concentration and current density had the biggest interaction effect on RE;the optimal experimental conditions were as follows:0.149 mol/L NaCl,18.11 mA/cm2 current density,3.804 cm electrode distance,and under these conditions,the RE achieved 66.43％;it also showed that the regression model reached significant level,and the validation results was in agreement with the predicted results,which proved the feasibility of the model in treating actual waste gas.
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