WUS O80 Wastewater Introduction Online Mid Term II Quiz Fall 2021
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Questions and Answers

What is the consequence of a faster flow velocity in a grit chamber than recommended?

  • Increased collection of organic matter in the grit (correct)
  • Reduced collection of organic matter in the grit
  • No effect on organic matter collection
  • Increased efficiency of grit chamber

    • What is the influent Total Suspended Solids (TSS) concentration for the clarifier if the outlet concentration is 60 mg/l and the known removal efficiency is 75%?

  • 300 mg/l
  • 240 mg/l (correct)
  • 120 mg/l
  • 80 mg/l

    • If the total suspended solids in a plant effluent is 12 mg/l and the effluent flow is 12 MGD, what is the amount of solids discharged daily?

  • 1,728,000 lbs (correct)
  • 12,000 lbs
  • 144,000 lbs
  • 2,016,000 lbs

    • Where is the media in trickling filters typically placed?

    <p>On a system of tile or columnar underdrains</p> Signup and view all the answers

    Which type of bacteria are the primary organisms responsible for treating wastewater in the trickling filter process?

    <p>Aerobic bacteria</p> Signup and view all the answers

    In which type of pond is it important to completely mix and aerate the content?

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

    What is the recommended placement for media in a trickling filter system?

    <p>On a system of tile or columnar underdrains</p> Signup and view all the answers

    What is the main composition of matter in wastewater?

    <p>Grit, sand, and silt</p> Signup and view all the answers

    What are the main objectives of primary sedimentation?

    <p>Settleable solids and floatables</p> Signup and view all the answers

    What is the major purpose of an inlet baffle in a settling tank?

    <p>Reduce velocity and disperse the flow</p> Signup and view all the answers

    What does the term 'volatile' refer to in the context of wastewater treatment?

    <p>Easily evaporating</p> Signup and view all the answers

    What is the main purpose of the trickling filter media?

    <p>To provide nutrients to the zoogleal mass growing on it</p> Signup and view all the answers

    Is it true that a well-operating primary clarifier will generally remove nearly all of the influent suspended solids?

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

    What is primarily responsible for the effective working of an anaerobic pond?

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

    Is it true that the algae is primarily responsible for the effective working of an anaerobic pond?

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

    What is the primary purpose of the trickling filter media?

    <p>To provide nutrients to the zoogleal mass growing on it</p> Signup and view all the answers

    Is it true that a well-operating primary clarifier will generally remove nearly all of the influent suspended solids?

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

    In an anaerobic pond, what is primarily responsible for the effective working?

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

    What is the main function of a grit chamber with a faster flow velocity than recommended?

    <p>Decrease inorganic solid removal</p> Signup and view all the answers

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