Only the BOD required to remove carbon.

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Multiple Choice

Only the BOD required to remove carbon.

Explanation:
The oxygen demand from oxidizing carbon compounds is called carbonaceous BOD, abbreviated CBOD. When you want only the portion of BOD related to removing carbon, CBOD is the measure you’re after, because NBOD (nitrogenous BOD) comes from oxidizing nitrogen compounds and would inflate the total BOD if not separated. In wastewater practice, CBOD is isolated (often with inhibitors) to focus on carbon removal, which is why CBOD is the correct term here. Bulking is a sludge settling issue, biomass refers to the microbial mass, and a blank option doesn’t describe a BOD component.

The oxygen demand from oxidizing carbon compounds is called carbonaceous BOD, abbreviated CBOD. When you want only the portion of BOD related to removing carbon, CBOD is the measure you’re after, because NBOD (nitrogenous BOD) comes from oxidizing nitrogen compounds and would inflate the total BOD if not separated. In wastewater practice, CBOD is isolated (often with inhibitors) to focus on carbon removal, which is why CBOD is the correct term here. Bulking is a sludge settling issue, biomass refers to the microbial mass, and a blank option doesn’t describe a BOD component.

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