If the chlorine demand is 4 mg/l and a residual of 0.1 mg/l is desired, what is the amount of chlorine required for 1.2 million gallons per day?

To determine the amount of chlorine required for a given situation, we first need to calculate the total chlorine needed to meet both the chlorine demand and achieve the desired residual.

In this scenario, the chlorine demand is 4 mg/l, and a residual of 0.1 mg/l is desired. Therefore, the total chlorine needed is the sum of these two values:

Total chlorine required (mg/l) = Chlorine demand (mg/l) + Desired residual (mg/l) Total chlorine required = 4 mg/l + 0.1 mg/l = 4.1 mg/l

Next, we convert the flow rate from million gallons per day to a more usable unit for calculations. There are 8.34 pounds of chlorine in one mg/l for one million gallons. Given that the flow rate is 1.2 million gallons per day, we calculate the required chlorine in pounds:

Chlorine required (pounds) = Total chlorine required (mg/l) × Flow rate (million gallons per day) × 8.34 pounds/mg/l Chlorine required = 4.1 mg/l × 1.2 million gallons/day × 8.34 pounds/mg/l

Calculating this gives:

Chlor