Which of the following is the last step in the wastewater treatment?

Screening

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Chlorination

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Segregation

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Aeration

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Solution

The correct option is B Chlorination
Disinfection or chlorination is the final stage in a wastewater treatment plant. Ozone and chlorine are commonly used to disinfect water during wastewater treatment.
These chemicals act as disinfectants and kill the harmful disease causing bacteria and other microbes, thus making the water fit for usage.

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