Skip to content
doubtly
Sign up

1 answer

Log in to upvote 0 Log in to downvote

Best answer

Answer: 4. Activated sludge

Key idea: In secondary treatment, a part of the activated sludge is passed to anaerobic sludge digesters.

Bacteria in the aeration tank form flocs; after settling, a small part of activated sludge is returned as inoculum and the rest is pumped into anaerobic sludge digesters, where anaerobic bacteria digest it and produce biogas. Primary sludge and floating debris are removed earlier.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
Was this answer helpful?
Sign in to comment

Your answer

Log in or create a free account to answer this question.