OBSERVATION ON EFFICACY OF CHLORINE DIOXIDE GENERATOR IN DISINFECTING DRINKING WATER HAN Yan-shu,CHEN Su-liang,ZHEN Su-juan,GUO Yi-xiu (Hebei Provincial Center for Disease Prevention and Control,Baoding 071000,China)
Abstract Suspencion quantitative method was used to observe the efficacy of chlorine dioxide disinfectant solution generated by the chlorine dioxide generator in killing microorganisms in water and its influencing factors.Results:The chlorine dioxide 0.375mg/L and 0.25mg/Lwith a 1 min contact time and 5 min contact time respectively could reduce Escherichia coli in water to 0 cfu/100ml.Its germicidal efficacy increased with increasing water temperature and decreased with increasing organic substances such as humic acid in water.pH value of water at 6.5~8.5 had no influence on germicidal efficacy. Key words chlorine dioxide generator;disinfection of drinking water;Escherichia coli