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28/10/2021 12:54 pm
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The domestic sewage in large cities
(1) when treated in STPs does not really require the aeration step as the sewage contains adequate oxygen.
(2) has a high BOD as it contains both aerobic and anaerobic bacteria.
(3) has very high amounts of suspended solids and dissolved salts.
(4) is processed by aerobic and then anaerobic bacteria in the secondary treatment in Sewage Treatment Plants (STPs).
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28/10/2021 12:55 pm
Correct answer: (4) is processed by aerobic and then anaerobic bacteria in the secondary treatment in Sewage Treatment Plants (STPs).