管道分质供水消毒副产物及其安全性评价

Disinfection by-products of dual supply water and its safety evaluation

消毒副产物是饮用水中应主要控制的毒害物。然而,管道分质供水中消毒副产物特征及污染水平很少研究。以某一管道分质供水工程为例,对其中消毒副产物进行了详细研究。研究结果表明,管道分质供水消毒副产物在量与质上与其源水自来水存在很大差别。在管道分质供水中消毒副产物量少,一般不到自来水的1/10,且主要是一些毒性较低、与供水管材有关的溶出物。据此计算出管道分质供水由消毒副产物引起的致癌风险性一般不到其源水的1/10,其安全性大大提高。

Disinfection by-products in drinking water may be harmful to the human body and should be controlled. A case study of the dual water supply engineering was investigated in term of disinfection by-products. The results showed that there are great differences both in quantity and quality between the dual supply water and its source water（ tap water）. The dual supply water has less amounts of disinfection by-products, about ten percent of the tap water, meanwhile the harmfulness of the disinfection by-products originated mainly from tube solution seem to be lower. On the basis of this, it is evaluated that the mutagenic effects of the disinfected by-products from the dual supply water is about ten percent of its source tap water.