Water Treatment: Removal of Suspended Solids
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Questions and Answers

What is the first stage of water treatment?

  • Filtration
  • Removal of suspended solids (correct)
  • Removal of heavy metals
  • Addition of disinfectants

    • What are suspended solids?

  • Substances that float on water
  • Particles larger than 2 microns (correct)
  • Dissolved ions
  • Heavy metals

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

  • Ground water
  • Rivers (correct)
  • Lakes
  • Municipal water

    • What is the purpose of a settling pond?

    <p>To allow suspended solids to settle by gravity</p> Signup and view all the answers

    What is the function of a clarifier in water treatment?

    <p>To remove particles from water using gravity</p> Signup and view all the answers

    What is the main benefit of removing suspended solids in water treatment?

    <p>Reducing treatment costs</p> Signup and view all the answers

    What happens if suspended solids are not removed from water?

    <p>Increased erosion of equipment</p> Signup and view all the answers

    [Blank] are particles that do not dissolve as ions and will either sink or float.

    <p>Suspended solids</p> Signup and view all the answers

    What is the residence time for water in a clarifier?

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

    What is used to speed up the settling time of colloidal particles in a clarifier?

    <p>Alum or synthetic polymer coagulant</p> Signup and view all the answers

    What is the purpose of backwashing a filter?

    <p>To free trapped solids</p> Signup and view all the answers

    What type of filter is often used to remove taste or odors from water?

    <p>Activated carbon filters</p> Signup and view all the answers

    What is used to pre-coat the tubes in a filter-aid tubular filter?

    <p>Diatomaceous earth or volcanic ash</p> Signup and view all the answers

    Which type of filter consists of a closed cylindrical housing with several screen-type cylindrical tubes?

    <p>Filter-aid tubular filters</p> Signup and view all the answers

    What happens to the pressure drop across a cartridge filter as it screens out more solids?

    <p>It increases</p> Signup and view all the answers

    What is used to remove chlorine from water in an industrial setting?

    <p>Activated carbon</p> Signup and view all the answers

    What material is the medium in a pressure filter made of?

    <p>Sand, anthracite coal, or calcite</p> Signup and view all the answers

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