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The chlorine contact tank of a water treatment plant is 69.5 m3 . The plant is...

The chlorine contact tank of a water treatment plant is 69.5 m3 . The plant is treating water at flow rate of 123456 m3 /week.The applied Ct value for 99.9% removal of Giardia protozoa is about 175 mg.min/L to achieve current drinking water standards. The new water standards need 99.999% removal of the same microbe to save population from Giardia infection. What would be the new chlorine dosage (mg/L) to satisfy the new water standard? Assume no infrastructure change.

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