The domestic sewage in large cities
Held on 30 Apr 2012 · Verified 9 Jul 2026.
has a high BOD as it contains both aerobic and anaerobic bacteria
is processed by aerobic and then anaerobic bacteria in the secondary treatment in Sewage Treatment Plants (STPs)
when treated in STPs does not really require the aeration step as the sewage contains adequate oxygen
has very high amounts of suspended solids and dissolved salts
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