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The form of sludge which is free from pathogenic bacteria is ___________

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in Environmental Engineering by (81.4k points)
The form of sludge which is free from pathogenic bacteria is ___________

(a) Undigested sludge

(b) Digested sludge

(c) Primary sludge

(d) Supernatant liquor

The question was asked in unit test.

The origin of the question is Digestion of Sludge, Sludge Digestion Tank in division Sewage Filtration and Activated Sludge Process of Environmental Engineering

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Best answer
Correct answer is (b) Digested sludge

To explain I would say: The digested sludge is free from pathogenic bacteria. It has the behavior of rich humus soil.

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