M&M I-Practice Chlorine Math
If your chlorine dose is 2.5 lbs/day, your chlorine residual is 0.5 mg/L, and your flow is 300 gpm, what is your chlorine demand in lbs/day?
Calculate flow in MGD
MGD = 300 gpm ÷ 694 gpm/MGD = 0.432 MGD
Calculate Chlorine Residual in lbs/day = (mg/L)(8.34 lbs/gal)(MGD)
Chlorine Residual, lbs/day = (0.5 mg/L)(8.34 lbs/gal)(0.432 MGD) = 1.8 lbs/day
Calculate Chlorine Demand in lbs/day = Chlorine Dose, lbs/day - Chlorine Residual, lbs/day
Chlorine Demand, lbs/day = 2.5 lbs/day - 1.8 lbs/day = 0.7 lbs/day
How about some practice calculating chlorine dosages, residuals, and demands in mg/L and lbs?
Day Flow Chlorine MGD Dose Residual Dose Residual Demand LBS mg/L mg/L LBS mg/L LBS 1 61 838 0.5 2 59 743 0.5 3 58 767 0.5 4 54 693 0.5 5 80 902 0.5 6 82 992 0.5 7 53 648 0.5 8 52 656 0.5 9 60 783 0.5 10 51 676 0.5 11 57 675 0.5 12 75 848 0.5 AVERAGE MAXIMUM MINIMUM
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