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The Importance of Filtration in Water Treatment

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Questions and Answers

Which type of filtration is effective for pathogen removal?

Slow sand filtration
Granular filtration
Rapid sand filtration (correct)
Membrane filtration

What is the purpose of filtration in water treatment?

To remove turbidity
To remove chlorine
To remove organic matter
To remove sediments (correct)

Why is chlorine disinfection alone not effective against some pathogens?

Some pathogens are resistant to chlorine
Chlorine is harmful to human health
Chlorine reacts with organic matter (correct)
Chlorine is not strong enough

What type of water sources require filtration according to the US EPA?

Surface water under the direct influence of surface water (A) Signup and view all the answers

What is a disadvantage of slow sand filtration?

Requires a large area (C) Signup and view all the answers

What are the main objectives of filtration in water treatment?

Remove particulates, organic matter, and micro-organisms and meet turbidity standards. Signup and view all the answers

What are the reasons for using filtration in surface water treatment or groundwater under the direct influence of surface water (GWUDI)?

US EPA requires filtration (or equally effective alternatives) to ensure pathogen removal. Signup and view all the answers

What are the differences between slow sand filtration and rapid sand filtration?

Slow sand filtration requires a large area, can fail with run-off tiny clays, and relies on physical and biological processes. Rapid sand filtration does not require biofilm and removes biofilm by backwash. Signup and view all the answers

What is the importance of filtration rate in water treatment?

Filtration rate affects the efficiency of pathogen removal and the rate of clogging. Signup and view all the answers

What is the purpose of backwashing in rapid sand filtration?

To remove the biofilm and prevent clogging. Signup and view all the answers

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