Water Treatment Class E 2025 – 400 Free Practice Questions to Pass the Exam

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How many pounds of chlorine gas are required per day to disinfect a water supply flowing at 1 MGD with a chlorine dose of 2 mg/L?

8.34 lbs/day

16.68 lbs/day

To determine the amount of chlorine gas required for disinfection in a water supply flowing at 1 Million Gallons Per Day (MGD) with a required chlorine dose of 2 mg/L, you start by converting the flow rate and the dosage into compatible units.

1 MGD is equivalent to 1,000,000 gallons. For chlorine dosing, it is essential to convert gallons to liters because the dosage is provided in milligrams per liter (mg/L). Since there are approximately 3.78541 liters in a gallon, 1 MGD equals about 3,785,410 liters per day.

The dosage of chlorine (2 mg/L) can be translated into total milligrams needed per day:

- Total chlorine needed = flow rate (in liters) × dosage (in mg/L)

- Total chlorine needed = 3,785,410 liters/day × 2 mg/L = 7,570,820 mg/day

Next, converting milligrams to pounds, you utilize the conversion factor that 1 pound equals 453,592 milligrams:

- Total chlorine needed in pounds = 7,570,820 mg/day ÷ 453,592 mg/lb ≈ 16.68 lbs/day

This calculation confirms

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25.66 lbs/day

31.28 lbs/day

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