The MOST important function of the primary clarifier is to remove:

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Prepare for the ADEQ Wastewater Treatment 1 Test. Study with quizzes, multiple-choice questions, and detailed explanations. Ace your exam!

Multiple Choice

The MOST important function of the primary clarifier is to remove:

Explanation:
The primary clarifier is designed to let solids settle by gravity. Heavier, settleable particles fall to the bottom as sludge, while lighter materials rise to the top and can be skimmed off. By removing these settleable solids, a large portion of the organic matter associated with them—reflected as BOD—is also taken out, which lowers the load entering the next treatment stage. Grit is usually removed in a grit chamber before the clarifier to protect equipment, and floatable solids are removed mainly by surface skimming rather than being the main goal of the clarifier. So, the essential function is to remove settleable solids along with the BOD tied to those solids.

The primary clarifier is designed to let solids settle by gravity. Heavier, settleable particles fall to the bottom as sludge, while lighter materials rise to the top and can be skimmed off. By removing these settleable solids, a large portion of the organic matter associated with them—reflected as BOD—is also taken out, which lowers the load entering the next treatment stage. Grit is usually removed in a grit chamber before the clarifier to protect equipment, and floatable solids are removed mainly by surface skimming rather than being the main goal of the clarifier. So, the essential function is to remove settleable solids along with the BOD tied to those solids.

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