Question 2031 of 223 · California Water Treatment Operator Exam
The CT value used in disinfection is calculated as
Exactly one answer is correct.
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Correct answer to question 2031
- A: disinfectant residual (mg/L) multiplied by contact time (minutes)
Explanation
CT is the product of concentration and time at the point of measurement, compared to the required CT for the log inactivation. The T10 time represents the time that 90 percent of the water is retained.
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