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Biochemical oxygen demand (BOD) -
The amount of oxygen required for five days in one litre of water at 200 C for the microorganisms to metabolite organic waste.
- wherein
Clear water has BOD less than 5 ppm , highly polluted water has BOD of 17 ppm or more.
As we have learnt in BOD
3-5 ppm is clean
6-19 ppm is polluted
Hence 'B' is more polluted than 'A'.
Option 1)
B is more polluted than A .
Option 2)A is suitable for drinking , whereas B is not .
Option 3)Both A and B are suitable for drinking .
Option 4)A is more polluted than B .