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Question
What is the function of a skimmer in a wastewater treatment plant?
Options:
A .  It helps in decomposing organic matter.
B .  It helps in removing suspended solids.
C .  It helps in removing large objects. 
D .  It helps in decomposing solids.
Answer: Option B
:
B
Sewage has different kinds of impurities such as suspended solids, oil, organic and inorganic impurities.
A skimmer is a type ofmachine whichhelps in separatingliquids(oil) or suspended particles from another liquid. It is usually used to separate oil and suspended solids from water in a wastewater treatment plant.

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