Chlorination / Dechlorination
Chlorine (Cl2) has been used since the early 1900's to treat municipal and industrial water and waste waters to control microorganisms because of its capacity to inactivate most pathogenic microorganisms quickly.
The effectiveness of chlorine is dependent on the chlorine concentration, time of exposure and the pH of the water. Chlorine is used for disinfection potable water where a residual chlorine concentration near 0.5 mg/L is commonly used.
In an industrial water treatment scheme, fouling of water intake lines, heat exchangers, sand filters, etc., may be prevented by maintaining a free re