NEET 2012
- Exam
- NEET
- Year
- 2012
- Subject
- Zoology
- Chapter
- Microbes in Human Welfare
NEET 2012 · Zoology · Microbes in Human Welfare
The domestic sewage in large cities
The domestic sewage in large cities
Options
- Ahas a high BOD as it contains both aerobic and anaerobic bacteria
- Bis processed by aerobic and then anaerobic bacteria in the secondary treatment in Sewage Treatment Plants (STPs)
- Cwhen treated in STPs does not really require the aeration step as the sewage contains adequate oxygen
- Dhas very high amounts of suspended solids and dissolved salts
Correct answer
B. is processed by aerobic and then anaerobic bacteria in the secondary treatment in Sewage Treatment Plants (STPs)
Step-by-step solution
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).