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Water Treatment Class 3-A Practice Test

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Sludge refers to
Correct Answer:
Sludge
Explanation:
Sludge is the settled solids that accumulate at the bottom of a clarifier or thickening tank. In wastewater treatment, after the solids have time to settle out of the water, the liquid on top is the supernatant, while the sludge at the bottom is the solid matter that can be thickened, digested, and eventually dewatered. Filtrate is the liquid that has passed through a filter, and turbidity describes how cloudy the water is due to suspended particles, not the actual solid mass itself. So sludge refers to that bottom-held, semi-solid mass of accumulated solids.

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