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Aerobic bacteria a) Flourish in the presence of free oxygen b) Consume organic m

ID: 1710368 • Letter: A

Question

Aerobic bacteria a) Flourish in the presence of free oxygen b) Consume organic matter as their food c) oxidize organic matter in sewage d) All the above Bar screens and grit chambers are used (a) Only in primary wastewater treatment plants (b) In most municipal wastewater treatment plants (c) Very rarely due to applications of modern technology (d) Only in advanced wastewater treatment plants (e) In most municipal water supply facilities Mixed liquor is a term used to describe the (a) Contents of a sludge digestion tank (b) Contents a activated sludge aeration tank (c) Film of microorganisms growing on a trickling filter (d) Drink a treatment plant operator has with his or her lunch (e) Contents of a sludge thickening tank Chlorination of water is done for the removal of a) Bacteria b) Sediments c) Suspended solids d) Hardness e) All the above Compared to surface water, ground water usually contains (a) a higher mineral content (b) more microorganisms (c) less dissolved minerals (d) less fluorides (e) less hydrogen sulfide, carbon dioxide, and methane

Explanation / Answer

2)-d

3)-b [as it removes inorganic suspended solids so it is a very important part of treatment plant]

4)-b

5)-a [chlorination is done only to kill pathogen or bacteria]

6)-a [Ground water contain more mineral than surface water]

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