Question 9033 of 234 · California Wastewater Operator Exam
A circular clarifier has a diameter of 60 ft and a water depth of 12 ft. The flow is 2.0 MGD. What is the detention time in hours?
Exactly one answer is correct.
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Correct answer to question 9033
- A: 3.0 hours
Explanation
Volume = 0.785 x 60 x 60 x 12 x 7.48 = 253,660 gal. Detention time = 253,660 / 2,000,000 x 24 = 3.0 hours.
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