Stability Investigation of a Stable Chlorine Disinfectant in Drinking Water under Half-open Condition

The stability and bacteriostasis of a kind of stable chlorine disinfectant under half-open condition were investigated. The result indicated the stable chlorine disinfectant persists its concentration a longer time in water. The half-life of its effective chlorine content in purified water lasted for about 250 days, and in tap water only 80 days. Bacteria did not grow in the purified water containing the stable chlorine disinfectant for 290 days in the period of experiment. However, when the effective chlorine content in tap water was less than 0.5 mg/L, bacteria began to grow and the number of bacteria increased obviously. Although purified water containing the stable chlorine disinfectant increased the content of disinfectant by-products to a certain extent, it did not affect the safety of drinking water. Stable chlorine disinfectant could be widely used in drinking water disinfection.