Sewage is waste water having food residue, animal and human excreta, detergents, discharges from commercial and industrial establishments. The domestic sewage is processed first by aerobic and then by anaerobic bacteria in secondary treatment in Sewage Treatment Plant (STPs).
The domestic sewage in large cities
NEET UG 2012 — Zoology Microbes in Human Welfare
2012mcqmedium
The domestic sewage in large cities
Official previous-year question
Held on 30 Apr 2012 · Verified 9 Jul 2026.
Options
- A
has a high BOD as it contains both aerobic and anaerobic bacteria
- B
is processed by aerobic and then anaerobic bacteria in the secondary treatment in Sewage Treatment Plants (STPs)
- C
when treated in STPs does not really require the aeration step as the sewage contains adequate oxygen
- D
has very high amounts of suspended solids and dissolved salts
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