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?

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

What is a disadvantage of slow sand filtration?

<p>Requires a large area (C)</p> Signup and view all the answers

What are the main objectives of filtration in water treatment?

<p>Remove particulates, organic matter, and micro-organisms and meet turbidity standards.</p> 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)?

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

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

<p>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.</p> Signup and view all the answers

What is the importance of filtration rate in water treatment?

<p>Filtration rate affects the efficiency of pathogen removal and the rate of clogging.</p> Signup and view all the answers

What is the purpose of backwashing in rapid sand filtration?

<p>To remove the biofilm and prevent clogging.</p> Signup and view all the answers

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