The Electrochemical Degradation Of Chlorinated Organic Compounds In Water In The Presence Of NaCl

In this paper,2,2’-dichlorodiethyl ether was used as the model chlorinatedorganics in order to remove the chlorinated organic compounds in the process of theresource utilization of propylene oxide saponification wastewater produced by thechlorine alcohol method. By means of gas chromatography, chemical oxygen demandand electrochemical measurement, and Ti/Ru-Ti-Sn metal oxide coating anode, westudy the electrochemical degradation process of2,2’-dichlorodiethyl ether in thesodium chloride water, discuss how electrochemical process parameters influence onthe effect of2,2’-dichlorodiethyl ether degradation, and optimize the electrochemicalprocess parameters by the results of orthogonal experiment.（1）We study the influence of composition of simulated wastewater on theanalysis results, and optimize the analysis method. In addition, we propose a methodto analyse electrochemical degradation intermediate products of2,2’-dichlorodiethyl ether. And it has been the basic of electrochemical degradationmechanism study;（2）The study on its electrochemical degradation mechanism indicates that theelectrochemical degradation process of2,2’-dichlorodiethyl ether in the sodiumchloride water is very complicated. It includes the indirect electro-oxidation of2,2’-dichlorodiethyl ether on the anode, the direct electro-reduction on the cathode, andthe direct and indirect electro-oxidation the electrochemical degradation intermediate on the anode;（3） the electrochemical degradation process of2,2’-dichlorodiethyl ether isinfluenced by the concentration of the sodium chloride, pH, current density, initialconcentration of organics and electrolytic time synthetically. Above all, because theconcentration of the sodium chloride influences the produce rate and concentration ofactive chlorine directly, which exists in the process of indirect electro-oxidation, theconcentration of the sodium chloride is the greatest impact on the degradation effectof2,2’-dichlorodiethyl ether in all the parameters;（4）we get the optimized conditions through the orthogonal experiment: theconcentration of the sodium chloride is0.5mol·L-1, current density is40mA·cm-2,electrolytic time is60minutes, pH is3, and initial concentration of organics is100mg·L-1. The conversion rate of2,2’-dichlorodiethyl ether has reached92.1%andthe removal rate of organics has reached85.4%by this parameter. This result has fitthe operating conditions of adsorbent degradation in the electrochemical combinedtechnology. In addition, the current efficiency is about74.2%.