The mixture of microorganisms and wastewater in an aeration tank is referred to as ________.

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Multiple Choice

The mixture of microorganisms and wastewater in an aeration tank is referred to as ________.

Explanation:
In the aeration tank you have a slurry of wastewater with the microorganisms doing the treatment. This active biomass is known as activated sludge, and the solids portion of that slurry is called mixed liquor suspended solids, or MLSS. So the in-tank mixture is described as mixed liquor, with its biomass quantified as MLSS, and it’s the same material referred to as the activated sludge in the process. That’s why the combined term MLSS/Activated sludge best fits: it covers both the mixture itself and the biomass within it. The broader “activated sludge system” refers to the whole process, not just the in-tank mixture, and other terms aren’t standard for this specific concept.

In the aeration tank you have a slurry of wastewater with the microorganisms doing the treatment. This active biomass is known as activated sludge, and the solids portion of that slurry is called mixed liquor suspended solids, or MLSS. So the in-tank mixture is described as mixed liquor, with its biomass quantified as MLSS, and it’s the same material referred to as the activated sludge in the process. That’s why the combined term MLSS/Activated sludge best fits: it covers both the mixture itself and the biomass within it. The broader “activated sludge system” refers to the whole process, not just the in-tank mixture, and other terms aren’t standard for this specific concept.

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