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
Correct Answer: B
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).
You need to login to perform this action.
You will be redirected in
3 sec
