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The results of analysis of a raw water sample are given below
[2003, 1 marks]Turbidity : 5 mg/L pH : 7.4 Fluorides : 2.5 mg/L Total Hardness : 300 mg/L Iron : 3.0 mg/L MPN : 50 per 100 ml
From the data given above, it can be inferred that water needs removal of
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- Turbidity followed by disinfection
- Fluorides and Hardness
- Iron, followed by disinfection
- Both (b) and (c)
Correct Option: C
Flourides allowable limit is 1 mg/l, it need to be removed. MPN is 50 and disinfection is required. Hardness desirable limit is 300 mg/l so no treatment is required. Turbidity limit is 5 NTV. So no treatment is required. Iron limit is 0.3 mg/l so it should be removed.
