Mixed Liquor Suspended Solids

06/29/25

“How can we represent the total mass of suspended solids in the aeration tank of an activated sludge process?”

Activated sludge treatment plants are one of the most widely used treatment systems in the world. These systems use suspended microorganisms in sludge to “eat” the organic matter present in the influent water. The total mass of suspended solids per volume in the influent-sludge mixture is quantified as Mixed Liquor Suspended Solids. Measuring the amount of mixed liquor suspended solids is useful for designing targets for treatment systems.

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