1.

The domestic sewage in large citiesA. Has a high BOD as it contains both aerobic and anaerobic bacteriaB. 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 oxygenD. Has very low amounts of suspended solids and dissolved salts

Answer» Correct Answer - B


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