Abstract：Objective To investigate the implementation effect of disinfecting drinking water by compound chlorine dioxide in rural areas of Sichuan Province, and to provide a scientific basis for hygienic monitoring of drinking water. Methods According to the Standards for Drinking Water Quality (GB 5749-2006), we evaluated and analyzed the microbiological, disinfection anddisinfection by-product indicators of 822 drinking water samples disinfected by compound chlorine dioxide and collected in rural areas of Sichuan Province during 2014-2016. Results The qualified rates of total coliforms and total bacterial count in the monitored drinking water samples were 87.7% and 82.4% respectively. There were statistically significant differences in the qualified rate of total coliforms between different water supply scales (χ2=23.872, P<0.001) and among different water source types (χ2=7.679, P=0.022), and the qualified rate was higher in the samples from large drinking water plants than in the ones from small drinking water plants as well as higher in the samples from deep wells than in the ones from reservoirs, rivers and streams. There were statistically significant differences in the qualified rate of total bacterial count among different water source types (χ2=22.572, P<0.001), and the qualified rate was higher in the samples from rivers and streams than in the ones from deep wells and reservoirs. The qualified rate of chlorine dioxide in the monitored water samples was 85.8%, and the qualified rate was higher in the samples from large drinking water plants than in the ones from small drinking water plants, showing statistically significant differences between different water supply scales (χ2=9.603, P=0.002). The qualified rates of disinfection by-products chlorite and chlorate were 99% and 99.3% respectively. Conclusions The disinfection effect of compound chlorine dioxide treating drinking water in rural areas of Sichuan Province is good, but fails to achieve the desired state. It is necessary to find out the specific reasons to improve the qualified rate of microbial indicators in rural drinking water.
2018, Vol. 25 
