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Coagulation

In domestic s...

Question

In domestic sewage, colloidal material includes

A

Sand, silt, clay

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B

Faecal matter, bacteria, cloth and paper fibres

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C

Nutrients (nitrate, ammonia, phosphate, sodium, calcium)

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D

All of the above

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Solution

The correct option is B Faecal matter, bacteria, cloth and paper fibres
The colloidal material of domestic sewage includes faecal matter, bacteria, and cloth and paper fibres.

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