An electric power plant consumes 2.5 million gallons per day of cooling water. T

Question

An electric power plant consumes 2.5 million gallons per day of cooling water. To control bacterial growth (slime), 2.0 mg/L of chlorine (measured as Cl2) is injected into the make-up water fed to the system. If the specific gravity of liquid chlorine is 3.21, what volume of

liquid chlorine must be stored in order to maintain a 30-day supply?

If the plant uses sodium hypochlorite instead, what volume of NaOCl will be needed? Assume that the dry density of NaOCl is 1.2 kg/L and that 1 mg/L of dissolved NaOCl is equivalent to 1 mg/L of dissolved Cl2.

Note: 1 gal = 3.78 L

Explanation / Answer

mass of chlorine needed per day = 2.5*10^6*3.78*10^-3*2 = 18900 g

mass needed per month = 330*18900 = 567000 g

density of chlorine, = 1000*3.21 = 3210 g/L

so volume of chlorine needed = 567000/3210= 176.6355 L

same mass of NaOCl will also be neededas 1 mg/L of dissolved NaOCl is equivalent to 1 mg/L of dissolved Cl2.

volume of NaoCl = 567000/1200 = 472.5 L

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