GATE ES 2024 ES Q46: Water and wastewater quality parameters

The Streeter–Phelps oxygen sag equation for a river is based on a few assumptions. The correct assumption(s) is/are

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At any instant the deoxygenation rate is direct proportional to the amount of oxidizable organic material present.

At any instant the deoxygenation rate is inversely proportional to the amount of oxidizable organic material present.

The reoxygenation rate is directly proportional to the dissolved oxygen deficit.

The reoxygenation rate and deoxygenation rate are directly proportional to the saturation concentration of dissolved oxygen.

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