First slide

Water Pollution and its Control

Question

Which one of the following impurities is easy to be removed from wastewater?

Easy

A

Bacteria
B

Colloids
C

Dissolved solids
D

Suspended solids

Solution

Suspended solids are relatively easier to remove from wastewater. They constitute mainly sand, silt, and clay. Most of these solids tend to settle if wastewater is left undisturbed for some time. They can be separated easily by physical means. Dissolved solids, both organic and inorganic, as well as bacteria and colloids, are relatively difficult to separate.

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