Topic: Sewage treatment and energy generation (biogas)· Biology and Human Welfare

Which of the following in sewage treatment removes suspended solids ?

1. Secondary treatment

2. Primary treatment

3. Sludge treatment

4. Tertiary treatment

Doubtly Asked 30 Oct 2026 NEET UG 2017 Practice test neet Save WhatsApp Report

1 answer

Best answer

Answer: 2. Primary treatment

Primary treatment of sewage is physical: filtration and sedimentation remove floating and suspended solids.

Secondary (biological) treatment reduces BOD with microbes, and tertiary treatment polishes the water further. Sludge treatment deals with the settled solids.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

Was this answer helpful?

Which of the following in sewage treatment removes suspended solids ?

1 answer

Your answer