ClO2和Cl2混合消毒剂对氯仿形成的影响

研究了ClO₂和Cl₂混合水溶液对黄腐酸、间苯二酚、间苯三酚和3,5-甲苯二酚等9种THMs前驱物在ClO₂/Cl₂各种配比、前驱物含量、反应pH、反应时间和温度等不同条件下对氯仿形成的影响.结果表明,随着ClO₂占混合消毒剂中质量分数的增加,形成氯仿量减少,在混合消毒剂中ClO₂的质量分数为25%、50%和75%时,CHCl₃生成量分别减少55%～65%,70%～86%和80%～93%;直到ClO₂占90%时,CHCl₃降低率才达到95%～99%.欲较彻底地控制氯仿的生成,ClO₂的质量分数必须大于90%.这为生产高纯ClO₂发生器以及用高纯ClO₂消毒的必要性提供了重要的科学依据.

Influence of the Mixed Disinfectant of ClO2 and Cl2 on Formation of Chloroform

The study on influence of mixed solution of ClO2 and Cl2 on formation of chloroform from 9 THMs precursors, such as fulvic acid (FA), resorcinol, phloroglucinol and cresorcinol etc. under conditions of different ClO2/Cl2 ratio, content of precursors, reaction pH, reaction time and reaction temperature etc. was studied. Results showed that as the mass percentage of ClO2 in the mixed disinfectant was increased, the amount of chloroform formed was reduced; such as when mass percentages of ClO2 were 25%, 50% and 75%, CHCl3 formed reduced 55%-65%, 70%-86% and 80%-93% respectively; until ClO2 was 90%, reduction of CHCl3 reached 95%-99%. In order to control the formation of chloroform thoroughly, mass percentage of ClO2 must be higher than 90%. This provided important scientific base for the necessity of using highly pure ClO2 in disinfection and developing generator which produced high quality ClO2.