The removal of nitrogen and phosphorus, compounds that promote eutrophication, are removed during which stage of wastewater treatment?

Primary treatment

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Secondary treatment

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Tertiary treatment

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Flitration

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Solution

The correct option is C Tertiary treatment
The tertiary step stabilizes oxygen-demanding substances in the wastewater and also removes nitrogen and phosphorus that secondary treatment was not able to clean up. Wastewater effluent becomes even cleaner in this treatment process through the use of stronger and more advanced treatment systems.

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