Question: Considering oxygen consumption by the microorganisms in the activated sludge process, which of the following statements is correct? The oxygen consumed by the microorganisms increases

Considering oxygen consumption by the microorganisms in the activated sludge process, which of the following statements is correct?
The oxygen consumed by the microorganisms increases as the SRT increases
The oxygen consumed by the microorganisms decreases as the HRT increases, if the SRT is kept constant
The oxygen consumed by the microorganisms does not depend on the influent substrate concentration
The occurrence of nitrification does not affect the total oxygen consumption by the microorganisms
The oxygen consumption by the microorganisms depends on the recycle ratio, if the SRT is kept constant

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