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Question 1 a) Calculate the volumetric flow rate of 12.5% (w/v as Cl$_2$) sodium hypochlorite (NaOCl) solution (in gallons per day) to give a free chlorine dose of 5.00 mg/L (as Cl$_2$) to filtered surface water containing no free chlorine residual at a flow rate of 10.0 million gallons per day. Use 1 gallon = 3.785 L & 1% (w/v) = 10.0 g/L. b) Calculate the monthly (30 days) requirement of 12.5% NaOCl solution at the treatment plant in gallons. Then, calculate the requirement in pounds. Use 1.17 g/cm$^3$ as the density of 12.5% NaOCl. c) Repeat Question a assuming that the volumetric flow rate of 12.5% NaOCl solution is negligible compared with the flow rate of filtered surface water. You can simplify your mass balance equation. d) Repeat Question a where the filtered surface water already contains 1.21 mg/L (as Cl$_2$) of free chlorine residual & wish to boost the residual to 5.00 mg/L (as Cl$_2$). Assume there is no free chlorine demand in the filtered surface water. e) Replace the 12.5% NaOCl solution in Questions a and b with chlorine gas (100% as Cl$_2$) and calculate the monthly requirement at the treatment plant in pounds. Discuss the difference in monthly requirements between NaOCl and chlorine gas.

          Question 1
a) Calculate the volumetric flow rate of 12.5% (w/v as Cl$_2$) sodium hypochlorite (NaOCl) solution (in
gallons per day) to give a free chlorine dose of 5.00 mg/L (as Cl$_2$) to filtered surface water
containing no free chlorine residual at a flow rate of 10.0 million gallons per day. Use 1 gallon = 
3.785 L & 1% (w/v) = 10.0 g/L.
b) Calculate the monthly (30 days) requirement of 12.5% NaOCl solution at the treatment plant in
gallons. Then, calculate the requirement in pounds. Use 1.17 g/cm$^3$ as the density of 12.5%
NaOCl.
c) Repeat Question a assuming that the volumetric flow rate of 12.5% NaOCl solution is negligible
compared with the flow rate of filtered surface water. You can simplify your mass balance
equation.
d) Repeat Question a where the filtered surface water already contains 1.21 mg/L (as Cl$_2$) of free
chlorine residual & wish to boost the residual to 5.00 mg/L (as Cl$_2$). Assume there is no free
chlorine demand in the filtered surface water.
e) Replace the 12.5% NaOCl solution in Questions a and b with chlorine gas (100% as Cl$_2$) and
calculate the monthly requirement at the treatment plant in pounds. Discuss the difference in
monthly requirements between NaOCl and chlorine gas.

Question 1
a) Calculate the volumetric flow rate of 12.5% (w/v as Cl$2$) sodium hypochlorite (NaOCl) solution (in
gallons per day) to give a free chlorine dose of 5.00 mg/L (as Cl2) to filtered surface water
containing no free chlorine residual at a flow rate of 10.0 million gallons per day. Use 1 gallon =
3.785 L 1% (w/v) = 10.0 g/L.
b) Calculate the monthly (30 days) requirement of 12.5% NaOCl solution at the treatment plant in
gallons. Then, calculate the requirement in pounds. Use 1.17 g/cm^3 as the density of 12.5%
NaOCl.
c) Repeat Question a assuming that the volumetric flow rate of 12.5% NaOCl solution is negligible
compared with the flow rate of filtered surface water. You can simplify your mass balance
equation.
d) Repeat Question a where the filtered surface water already contains 1.21 mg/L (as Cl2) of free
chlorine residual wish to boost the residual to 5.00 mg/L (as Cl2). Assume there is no free
chlorine demand in the filtered surface water.
e) Replace the 12.5% NaOCl solution in Questions a and b with chlorine gas (100% as Cl$2$) and
calculate the monthly requirement at the treatment plant in pounds. Discuss the difference in
monthly requirements between NaOCl and chlorine gas.

Added by Kimberly A.

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