Sewer Collection Systems Operator Practice Test

Which of the following is NOT a step in preliminary treatment?

Screening Grit Removal Oil and Grease Removal Biological Digestion

Correct Answer:

Biological Digestion

Explanation:

Preliminary treatment aims to quickly remove solids that could clog or damage equipment early in the process. Screening traps large debris, grit removal settles out sand and heavy inorganic material, and oil and grease removal targets fats and oils that can cause blockages or odor issues in subsequent steps. Biological digestion, on the other hand, is a secondary treatment process that biologically breaks down organic matter in sludge, typically in a digestion tank after the initial physical treatment. It is not part of preliminary treatment, which is why it is the correct choice.

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