Computer · Environmental Engineering

Which of the following processes represents the primary mechanism that takes place inside a well-designed functioning septic tank?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1Clarified water settles completely at the bottom of the tank underneath the heavy sludge layer.
2Sludge stays permanently at the top of the tank to undergo aerobic digestion.
3Suspended solids must separate by settling down to form sludge while lighter oils and grease float to form scum.✓
4Water must remain mixed with the sludge at all levels.

Correct answer

Suspended solids must separate by settling down to form sludge while lighter oils and grease float to form scum.

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