A trickling filter is primarily a :

1.	A trickling filter is primarily a :
A.	straining process to remove suspended solids from sewage
B.	biological oxidation process to remove BOD from sewage
C.	straining process to remove turbidity from water
D.	straining process to remove bacteria from water
Answer» C. straining process to remove turbidity from water

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A trickling filter is primarily a :

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