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Which one of the following impurities is...

Which one of the following impurities is easiest to remove from wastewater ?

A

Bacteria

B

Colloids

C

Dissolved soilds

D

Suspended solids

Text Solution

Verified by Experts

The correct Answer is:
D
Suspended solids are relatively easier to remove from waste water. They constitue mainly sand, slit and clay. Most of these solids tend to settle if waste water is left undisturbed for sometime. They can be seperated easily by physical means. Dissolved solids, both organic and inorganic (nitrates, phosphates, etc.) as well as bacteria and colloids are relatively difficult to seperate.
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