Civil Engineering MCQAE Level Civil Engineering
Slow sand filters remove bacteria mainly through:
Environmental EngineeringEnvironmental EngineeringHARD
Choose the correct answer
A
reverse osmosis membrane
B
chlorine gas stored in sand
C
biological layer or schmutzdecke
D
lime precipitation only
Correct Answer
C. biological layer or schmutzdecke
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The biologically active surface layer is crucial for pathogen and organic removal in slow sand filtration.
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