Chlorine is to be used for disinfection of water prior to delivery to customers.

Question

Chlorine is to be used for disinfection of water prior to delivery to customers. A free chlorine concentration of 1.0 mg/L is to be maintained in a chlorine contact tank system and you have determined that a CT value of 120 mg/L·min is appropriate for design to achieve a 3-log reduction in Giardia concentration. If a t10/t0 value of 0.70 can be expected from the type of contact tankage being provided, what should be the volume of each of two parallel tanks if each is to receive a design flow rate of 0.070 m3/s? (report answer to nearest m^3 and recall that t10/t0 is the time required (t10) for 10% of the mass of a dye slug to leave a tank divided by the theoretical HRT ( or t0) of the tank)

Explanation / Answer

CTrequired= C*T

Also, T=(Volume/Flow rate)*Baffle factor

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