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Question

Chlorine usage in the treatment of 25000 m3/day is 9 kg/day. The residual chlorine after 10 minutes of contact is 0.2 mg/l. Calculate the dosage in milligram per liter and the chlorine demand of the water.

A
0.36 mg/L, 0.16 mg/L
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B
0.36 mg/L, 0.36 mg/L
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C
0.16 mg/L, 0.36 mg/L
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D
0.16 mg/L, 0.16 mg/L
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Solution

The correct option is A 0.36 mg/L, 0.16 mg/L
Water treated per day = 25000 m3

= 25×106 liters/day

Chlorine consumed per day = 9 kg =9×106 mg/day

Chlorine used per litre of water =9×10625×106

=0.36 mg/l

Also, residual chlorine = 0.2 mg/l

Chlorine demand = 0.36 - 0.2 = 0.16 mg/l

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