Question

Organic matter is decomposed by __________ bacteria in aeration tanks.

Answer 1

1. During secondary treatment, aerobic and/or anaerobic bacteria work on the organic matter present in sewage to settle it to the bottom of aeration tanks.
2. Air is sometimes blown into these tanks to speed up the activity of aerobic microorganisms.
3. The process takes place in closed tanks or chambers. In either case, the action of bacteria makes solids settle at the bottom.
4. This is called biological or secondary sludge. This too can be used to produce compost and biogas.

Final answer: Organic matter is decomposed by aerobic bacteria in aeration tanks.