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In which of the following, both primary and secondary tanks are used?

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in Environmental Engineering by (81.4k points)
In which of the following, both primary and secondary tanks are used?

(a) Two stage sludge digesters

(b) Single stage  sludge digesters

(c) Low rate digesters

(d) High rate digesters

This question was addressed to me during a job interview.

My enquiry is from Digestion of Sludge, Sludge Digestion Tank in portion Sewage Filtration and Activated Sludge Process of Environmental Engineering

1 Answer

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Best answer
The correct answer is (a) Two stage sludge digesters

To elaborate: In two stage sludge digesters, the sludge is passed in the primary tank for 7 days and then it is passed in the secondary tank followed by the removal of residual matter.

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