Sanitary Plant Tour - 6. Chlorination and Dechlorination
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Chlorination and Dechlorination
and Contact Chamber
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After secondary treatment, the wastewater is disinfected by the use of sodium hypochlorite, a form of chlorine. The sodium hypochlorite is injected into the waste- water to kill any pathogenic microorganisms that may be present. The sodium hypochlorite and wastewater are kept in contact with one another for several hours to ensure complete disinfection. The tank where this occurs is called a "contact basin" or chamber.
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After the disinfection process is complete, the remaining sodium hypochlorite must be removed before the wastewater can be discharged into Conejo Creek. Sodium hypochlorite is an oxidizing agent that could harm any aquatic organisms living in the creek. By adding sodium bisulfate to the wastewater, the sodium hypochlorite is rendered harmless.
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