Question 7009 of 234 · California Wastewater Operator Exam
For disinfected tertiary recycled water, California Title 22 requires a chlorine disinfection process to provide a CT of at least 450 mg-min/L and a modal contact time of at least
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Correct answer to question 7009
- C: 90 minutes at peak dry weather design flow
Explanation
22 CCR 60301.230(a)(1) requires a CT (total chlorine residual times modal contact time) of not less than 450 mg-min/L at all times, with a modal contact time of at least 90 minutes based on peak dry weather design flow. Permits for other discharges set their own residual and contact time.
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