Answer: A. 0 ppm
Biochemical oxygen demand of safe drinking water must be 0 ppm.
Solution
As per IS 10500: 2012
Drinking water quality parameters are
Parameter | Standard value |
pH | 6.5-8.5 |
TDS(mg/l) | 500 |
Hardness as CaCO3(mg/l) | 200 |
BOD (ppm) | 0 |
Alkalinity as CaCO3(mg/l) | 200 |
The presence of BOD shows the presence of organic matter into it which depicts the presence of microorganism into it. And in drinking water there should not be any microorganism present into it. Hence, Biochemical Oxygen Demand (BOD) of drinking water should be zero.
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