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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              

 

Answers to I-Practice Chlorine Math

 

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