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

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Prepare for the Sewer Collection Systems Operator Test. Study with multiple choice questions, each with hints and explanations. Ensure success on your exam!

Multiple Choice

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

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.

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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