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Chlorine gas may be added to the treated effluent to disinfect it (kill pathogens) prior to discharge. This is usually a tertiary or quaternary treatment.

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During primary treatment at a sewage treatment plant?

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Chlorine is used to kill harmful pathogens in the treated sewage before discharge to a receiving watercourse. This is similar to its use in swimming pools. Similar treatment can be provided by using bromine, ozone or ultraviolet light.


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