Which of the following substances are used in teritiary treatment (physio-chemical) of water recycling stages?

All the above

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nitrogen

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phosphorus

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alum

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Solution

The correct option is A All the above
Tertiary treatment:
Tertiary or advanced treatment is the final step of sewage treatment.
It involves removal of inorganic constituents such as nitrogen, phosphorus and microorganisms.
The fine colloidal particles in the sewage water are precipitated by adding chemical coagulants like alum or ferric sulphate.

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