Oxidation: Chlorine acts as an oxidizing agent, removing dissolved metals, organic matter, and other impurities from the water. It helps to oxidize iron, manganese, and hydrogen sulfide, which can cause discoloration, taste and odor issues, and promote the growth of certain bacteria.
Residual protection: Chlorine maintains a residual concentration in the water distribution system, providing ongoing protection against microbial contamination as water travels from the treatment plant to consumers' taps. This residual chlorine helps to prevent recontamination of water during storage and distribution.
Color and odor control: Chlorine helps control taste and odor issues by oxidizing compounds that can cause unpleasant flavors or smells in water. It can remove odors caused by decaying organic matter, algae, or industrial pollutants.
Biofilm control: Chlorine helps control the growth of biofilm, a slimy layer of microorganisms that can form on the inner surfaces of water pipes. Biofilm can harbor bacteria and affect the quality and safety of drinking water. Chlorine helps to inhibit the formation and growth of biofilm.
Regulation: The use of chlorine as a disinfectant in drinking water is widely regulated by health authorities and government agencies to ensure the safety and quality of public water supplies. Chlorine is considered a safe and effective disinfectant when used within recommended dosages.
It's worth noting that while chlorine is necessary for water disinfection, it can react with organic matter in the water to form disinfection byproducts (DBPs) such as trihalomethanes (THMs) and haloacetic acids (HAAs). These byproducts have been associated with potential health effects, and their levels are regulated to minimize any risks.
