Question 6029 of 223 · California Water Treatment Operator Exam
A required CT is 36 mg/L-min and the chlorine residual at the end of the clearwell is 1.5 mg/L. What minimum contact time is needed?
Exactly one answer is correct.
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Correct answer to question 6029
- B: 24 minutes
Explanation
Time = CT / residual = 36 / 1.5 = 24 minutes. Multiplying gives 54.
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