1, free chlorine preparation
Free residual chlorine refers to chlorine-containing disinfectant. After contacting with water for a certain period of time, it will not only consume a part after interacting with bacteria, microorganisms and organic substances in water, but also leave hypochlorous acid, hypochlorous acid ions or dissolved elemental chlorine in water.
2. Monochloramine
When chloramine is used for disinfection, monochloramine, dichloramine and trichloroamine will be produced when ammonia is added to chlorinated drinking water. Adding monochloramine to the drinking water distribution system can maintain the residual disinfection effect.
Development of disinfectants for drinking water;
/kloc-in the second half of the 0/9th century, many reports and patents appeared in Britain and America, mostly involving the treatment of water with voltage, magnetic field, current, chlorine, potassium permanganate and hypochlorous acid. Humans have been actively using chemical agents for sterilization and disinfection since the beginning of the19th century.
At first, chlorine compounds were mainly used. For example, after 1820 invented bleaching powder, people used it to disinfect drinking water and treat infected wounds, and the effect was good. This is the first milestone of chemical sterilization.
Since then, people have developed the second generation disinfectant dichloroisocyanuric acid and the third generation disinfectant trichloroisocyanuric acid, which are only used for small-scale disinfection. Chlorine dioxide is called the fourth generation disinfectant.
Baidu Encyclopedia-Drinking Water Disinfection Technology