Water Treatment: Removal of Suspended Solids
20 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the first stage of water treatment?

  • Filtration
  • Removal of heavy metals
  • Disinfection
  • Removal of suspended solids (correct)

    • What are suspended solids?

  • Particles smaller than 2 microns that dissolve as ions
  • Particles smaller than 2 microns that do not dissolve as ions
  • Particles larger than 2 microns that do not dissolve as ions (correct)
  • Particles larger than 2 microns that dissolve as ions

    • Why do suspended solids need to be removed from water?

  • To increase the levels of heavy metals
  • To reduce the cost of filtration
  • To increase the velocity of water
  • To prevent operational issues like deposits and erosion (correct)

    • Where is water likely to have higher levels of suspended solids?

    <p>Water drawn from rivers and lakes (C)</p> Signup and view all the answers

    What is the purpose of a settling pond or basin in water treatment?

    <p>To slow or delay the velocity of water to allow suspended solids to settle (A)</p> Signup and view all the answers

    What is a clarifier in water treatment?

    <p>A settling tank that uses gravity to settle out particles (A)</p> Signup and view all the answers

    How are suspended solids removed from ground water?

    <p>Through filtration (C)</p> Signup and view all the answers

    What is the primary benefit of removing suspended solids from water?

    <p>Preventing plugging of equipment (B)</p> Signup and view all the answers

    Which stage of water treatment removes other harmful substances like heavy metals?

    <p>Filtration (B)</p> Signup and view all the answers

    How does a clarifier differ from a settling pond?

    <p>A clarifier is a large settling tank while a settling pond allows suspended solids to float. (B)</p> Signup and view all the answers

    What is the residence time for water in a clarifier?

    <p>An hour or two (C)</p> Signup and view all the answers

    What is added to speed the settling time for colloidal particles in a clarifier?

    <p>Synthetic polymer coagulant (C)</p> Signup and view all the answers

    What are the most common types of filters mentioned in the text?

    <p>Pressure filters, filter-aid tubular filters, cartridge filters, activated carbon filters (C)</p> Signup and view all the answers

    What is the purpose of backwashing in a filter?

    <p>To remove trapped solids (B)</p> Signup and view all the answers

    What is a common material used for the filter medium in a pressure filter?

    <p>Diatomaceous earth (C)</p> Signup and view all the answers

    What does an activated carbon filter effectively remove from water?

    <p>Taste or odors (A)</p> Signup and view all the answers

    How is filter cake removed in a tubular filter during backwashing?

    <p>By reversing the flow of water through the tubes (B)</p> Signup and view all the answers

    What indicates that a cartridge filter needs to be replaced?

    <p>Increased pressure drop across the filter (D)</p> Signup and view all the answers

    What happens during backwashing of a filter if excessive flow rate is used?

    <p>Trapped solids will not come free (A)</p> Signup and view all the answers

    What is transformed into activated carbon by heating with steam?

    <p>Coconut shells (D)</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser