What is the purpose of dechlorination in tertiary wastewater treatment?
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A.
To remove the chlorine that was used to disinfect the water
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B.
To filter out large solid contaminants
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C.
To add chlorine to kill bacteria and viruses
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D.
To purify wastewater through oxidation
Correct Answer:
A. To remove the chlorine that was used to disinfect the water
Explanation:
Dechlorination is a critical step in tertiary wastewater treatment designed to neutralize and eliminate residual chlorine from the water before it is discharged into natural environments. Since chlorine is highly toxic to aquatic life, including fish and beneficial microorganisms, this process ensures that the treated effluent does not harm the ecosystem. By using chemical agents or carbon filtration to strip the disinfectant, the water is made safe for release into rivers or lakes without leaving behind harmful chemical traces.
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