The domestic sewage in large cities (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 amount of suspended solids and dissolved salts.

The domestic sewage in large cities
(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 amount of suspended solids and
dissolved salts.
by

1 Answer

Answer :

(b) is processed by aerobic and then anaerobic
bacteria in the secondary treatment in Sewage
Treatment Plants (STPs)
by

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