A hypothetical water treatment train consisting of coagulation/flocculation unit

Question

A hypothetical water treatment train consisting of coagulation/flocculation unit, filtration unit and chlorination system is used to treat surface water characterized by bacterial concentration of 800,000 CFU/L. If the log removal for each system is as given in the Table below, what is the final concentration of CFU/L after the water goes through the treatment train?

Treatment Train Unit                    Log Removal for the unit

Coagulation/Flocculation 2.1

Filtration 1.3

Chlorination                                     2.5

Explanation / Answer

Filtration 1.3

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