WATR 081 - Spring 2022 Module 5 Assessment Quiz
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Questions and Answers

What percentage of settleable solids can a well-operated primary clarifier remove?

  • 90% (correct)
  • 50%
  • 70%
  • 80%

    • Can operators use sludge blanket levels in primary clarifiers to adjust sludge pumping rates?

  • No
  • Yes (correct)
  • It depends
  • Sometimes

    • Do baffles ahead of outlet weirs in primary tanks serve as a barrier to inhibit the loss of floating solids and grease?

  • Only on sunny days
  • It depends on the design
  • No
  • Yes (correct)

    • If a primary clarifier does not have adequate detention time, what would be the result?

    <p>Overloading of collector or flight drive motor (C)</p> Signup and view all the answers

    What happens if the sludge depth in a secondary sedimentation tank is too high?

    <p>Sludge may become septic (B)</p> Signup and view all the answers

    At a 2.5 MGD wastewater treatment plant, if the primary clarifier has a detention time of 2 hours, how many gallons does this clarifier hold?

    <p>$10,000$ gallons (C)</p> Signup and view all the answers

    What percentage of settleable solids can a well-operated primary clarifier remove?

    <p>90-95% (D)</p> Signup and view all the answers

    Can operators use sludge blanket levels in primary clarifiers to adjust sludge pumping rates?

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

    Do baffles ahead of outlet weirs in primary tanks serve as a barrier to inhibit the loss of floating solids and grease?

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

    What would be the result if a primary clarifier does not have adequate detention time?

    <p>Overloading of collector or flight drive motor (C)</p> Signup and view all the answers

    If the sludge depth in a secondary sedimentation tank is too high, what will happen?

    <p>Sludge may become septic (D)</p> Signup and view all the answers

    At a 2.5 MGD wastewater treatment plant, if the primary clarifier has a detention time of 2 hours, how many gallons does this clarifier hold?

    <p>$10,000$ gallons (D)</p> Signup and view all the answers

    What percentage of settleable solids can a well-operated primary clarifier remove?

    <p>90-95% (C)</p> Signup and view all the answers

    Can operators use sludge blanket levels in primary clarifiers to adjust sludge pumping rates?

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

    Do baffles ahead of outlet weirs in primary tanks serve as a physical barrier to inhibit the loss of floating solids and grease?

    <p>True (A)</p> Signup and view all the answers

    If the sludge depth in a secondary sedimentation tank is too high, what will happen?

    <p>Sludge may become septic (C)</p> Signup and view all the answers

    What would be the result if a primary clarifier does not have adequate detention time?

    <p>Overloading of collector or flight drive motor (A)</p> Signup and view all the answers

    At a 2.5 MGD wastewater treatment plant, if the primary clarifier has a detention time of 2 hours, how many gallons does this clarifier hold?

    <p>15,000 gallons (B)</p> Signup and view all the answers

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