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The color of digestive sludge is ___________

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+1 vote
in Environmental Engineering by (81.4k points)
The color of digestive sludge is ___________

(a) Blue

(b) Black

(c) Brown

(d) Gray

This question was posed to me during an online interview.

I'd like to ask this question from Digestion of Sludge, Sludge Digestion Tank in chapter Sewage Filtration and Activated Sludge Process of Environmental Engineering

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Correct option is (b) Black

For explanation I would say: The color of the digestive sludge is black. It has an inoffensive odor.

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