CT value is calculated as Residual (mg/L) × Contact Time (min). If residual is 2 mg/L and contact time is 15 min, CT equals?

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Prepare for the ADEQ Water Treatment Grade 4 Exam. Benefit from multiple choice questions, real-life scenarios, and detailed explanations. Boost your chances of success!

Multiple Choice

CT value is calculated as Residual (mg/L) × Contact Time (min). If residual is 2 mg/L and contact time is 15 min, CT equals?

Explanation:
CT value is found by multiplying the residual disinfectant concentration (mg/L) by the contact time (minutes). With a residual of 2 mg/L and a contact time of 15 minutes, multiply 2 × 15 to get 30. So the CT value is 30 mg·min/L. This shows how much disinfection exposure the water has had; the other numbers would come from different residuals or times.

CT value is found by multiplying the residual disinfectant concentration (mg/L) by the contact time (minutes). With a residual of 2 mg/L and a contact time of 15 minutes, multiply 2 × 15 to get 30. So the CT value is 30 mg·min/L. This shows how much disinfection exposure the water has had; the other numbers would come from different residuals or times.

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