How many pounds\/day of chlorine gas are required to disinfect a water supply flowing at a rate of 1 MGD, if the desired chlorine dose is 2 mg\/L?<\/span><\/li>\n<\/ol>\n <\/span><\/p>\n2. How many pounds\/day of 65% calcium hypochlorite are required to disinfect the same water supply, flowing at a rate of 1 MGD, with a desired chlorine dose of 2 mg\/L?<\/span><\/p>\n <\/h2>\n
<\/span><\/strong><\/span><\/p>\n <\/span><\/strong><\/span><\/p>\nANSWER FOR PRACTICE PROBLEM # 1:<\/span><\/strong><\/span><\/p>\n <\/span><\/strong><\/span><\/h2>\nStep 1: LIST ALL THE DATA GIVEN<\/span><\/strong><\/span><\/h2>\n <\/span><\/strong><\/span><\/p>\nKNOWN<\/span><\/strong> <\/span><\/p>\nFlowrate = 1 MGD <\/span><\/p>\nChlorine dose = 2 mg\/L<\/span><\/p>\n <\/strong><\/span><\/span><\/p>\nUNKNOWN<\/strong><\/span><\/span><\/p>\nlbs\/day of chlorine gas required = ?<\/span><\/p>\n <\/span><\/strong><\/span><\/h2>\nStep 2: CALCULATE LBS\/DAY OF CHLORINE GAS REQUIRED<\/span><\/strong><\/span><\/h2>\n <\/span><\/span><\/p>\nlbs \/ day = (Flowrate, MGD) x (Dose, mg\/L) x (8.34 lbs\/gallon)<\/span><\/span><\/p>\n <\/span><\/em><\/p>\n\u2666First, enter the flowrate in MGD, and chlorine dose in mg\/L.<\/span><\/em><\/p>\n <\/span><\/p>\nlbs \/ day = (1 MGD) x (2 mg\/L) x (8.34 lbs\/gallon)<\/span><\/p>\n= 16.68 lbs\/day of chlorine gas required<\/span><\/strong><\/p>\n <\/span><\/em><\/p>\n\u2666To sum up, this is the lbs\/day of chlorine gas required to disinfect the water supply. Moreover, note that chlorine gas is 100% pure chlorine. <\/span><\/em><\/p>\n\u2666Next, we’re going to solve a similar water treatment practice problem. However, it involves a different type of disinfectant: 65% calcium hypochlorite, which has a strength equal to 65% of chlorine gas. In short, 65% calcium hypochlorite is weaker than chlorine gas. As you’ll see, it requires one extra step to solve. <\/span><\/em><\/p>\n <\/span><\/strong><\/span><\/p>\n <\/span><\/strong><\/span><\/p>\nANSWER FOR PRACTICE PROBLEM # 2:<\/span><\/strong><\/span><\/p>\n