Question

what is sludge and how is it treated​

Answer 1

SLUDGE IS A LIQUID. PRODUCTS CANE FROM INDUSTRIAL WASTE.

THE SLUDGE IS TREATED BY THE PROCESS OF AERATION.

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Answer 2

Explanation:

$\The residue that accumulates in sewage treatment plants is called sludge (or biosolids). Digested sludge is passed through a dewatering step; the dried solids are disposed of, and the water is sent back to secondary treatment. ...$