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Assuming a C.t value of 0.8 mg.min/L for free chlorine disinfection of E.coli yielding 99% kill...

Assuming a C.t value of 0.8 mg.min/L for free chlorine disinfection of E.coli yielding 99% kill with a free residual chlorine concentration of 2.0 mg/L. Estimate the required contact time to kill 99.9% with the same chlorine concentration. The temperature is constant during all disinfection processes.

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Chick-Watson model is used.

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