三门峡市二次供水水质消毒检测调查分析

目的 了解三门峡市居民区二次供水的水质消毒情况,降低饮用水的安全隐患,为卫生监督部门提供相应的技术支撑.方法 依照GB T5750-2006《生活饮用水卫生标准检验方法》,对三门峡市2019年1月—2020年12月间50家居民区二次供水单位采样检测,了解二次供水的水质消毒情况.结果 此次消毒剂余量的检测中,使用二氧化氯...

Analysis on Water Quality Disinfection Test of Secondary Water Supply in Sanmenxia City

Objective To understand the water quality disinfection of secondary water supply in residential areas of Sanmenxia City,reduce the potential safety hazards of drinking water sanitation,and provide corresponding technical support for health supervision departments.Methods According to GB T5750-2006 hygienic standard test method for drinking water,50 secondary water supply units in residential areas in the city from January 2019 to December 2020 were sampled and tested to understand the disinfection of secondary water supply quality.Results A total of 258 samples were disinfected with chlorine dioxide,256 were qualified,and the qualified rate was 99.22%.There were 642 samples disinfected with chlorine dioxide,580 samples qualified with free residual chlorine,and the qualified rate was 90.34%.There was significant difference in the qualified rate of disinfection margin between the two disinfection types(P<0.05).Among all disinfection by-products,only carbon tetrachloride was not detected,and the detection rates of other detection indexes were 4.43%-87.23%.The items exceeding the standard in the disinfection by products detected this time include chloroform,trihalomethane,chlorate and chlorite.There is no significant difference in the exceeding the standard rate of factory water and terminal water(P>0.05).Conclusion The disinfectant residue of secondary water supply units in Sanmenxia City is unqualified,and the pollution of disinfection by-products is serious.Relevant departments should strengthen the supervision of drinking water hygiene and safety.