railway RRB JE (CBT I + CBT II) Mock Test 2024 Environmental Engineering Disposing of Sewage Effluents
The 'Sag' in the dissolved oxygen curve results because:
1
it is a function of the rate of addition of oxygen to the stream
2
it is a function of the rate of depletion of oxygen from the stream
3
it is function of the rate of both addition and depletion of oxygen from the stream
4
the rate of addition of oxygen is linear but the rate of depletion of oxygen is non-linear