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What is the average retention time in aerobic treatment system?

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+1 vote
in Hazardous Waste Management by (63.0k points)
What is the average retention time in aerobic treatment system?

(a) 20 minutes

(b) 10 minutes

(c) 30 minutes

(d) 40 minutes

I have been asked this question in an interview for internship.

My enquiry is from Biological Treatment topic in portion Chemical, Physical & Biological Treatment of Hazardous Waste Management

1 Answer

0 votes
by (424k points)
Correct choice is (a) 20 minutes

The explanation: Average retention times in aerobic systems range from 20 minutes in biological filters to 24 hours in activated sludge plants.

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