WATRO80 Wastewater Introduction Mid Term II Quiz Fall 2021
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Questions and Answers

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

  • Reduced grit accumulation
  • No impact on the organic matter in the grit
  • Decreased organic matter in the grit
  • Increased organic matter in the grit (correct)

    • What would be the result of allowing organic matter to collect in the grit due to excessive flow velocity?

  • Reduced odor in the wastewater
  • Enhanced removal of debris
  • Decreased grit chamber efficiency (correct)
  • Improved performance of the system

    • What is the impact of excessive flow velocity on the recommended functioning of a grit chamber?

  • Reduces the need for maintenance
  • Hinders proper settling of grit (correct)
  • Improves sedimentation of particles
  • Minimizes turbulence in the chamber

    • Why is it important to maintain the recommended flow velocity in a grit chamber?

    <p>To prevent accumulation of debris (D)</p> Signup and view all the answers

    What is the impact of excessive flow velocity on a grit chamber?

    <p>Increases organic matter collection in the grit (D)</p> Signup and view all the answers

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

    <p>Increased organic matter collection in the grit (D)</p> Signup and view all the answers

    What is the primary purpose of preliminary treatment at most treatment plants?

    <p>To protect pumping equipment and facilitate subsequent treatment processes (C)</p> Signup and view all the answers

    Does pre-aeration improve settleability in the primary clarifier?

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

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

    <p>It may allow appreciable organic matter to collect in the grit. (A)</p> Signup and view all the answers

    What could happen if an excessive flow velocity is maintained in a grit chamber?

    <p>The removal of organic matter from the grit will be less effective. (B)</p> Signup and view all the answers

    Why is it crucial to maintain the recommended flow velocity in a grit chamber?

    <p>To avoid the accumulation of appreciable organic matter in the grit. (B)</p> Signup and view all the answers

    What impact does excessive flow velocity have on the functioning of a grit chamber?

    <p>It hinders the proper functioning of a grit chamber. (B)</p> Signup and view all the answers

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

    <p>Appreciable organic matter collection (D)</p> Signup and view all the answers

    What is the primary purpose of preliminary treatment at most treatment plants?

    <p>To remove grit and protect pumping equipment (D)</p> Signup and view all the answers

    Does pre-aeration improve settleability in the primary clarifier?

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

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

    <p>Appreciable organic matter collection in the grit (A)</p> Signup and view all the answers

    Why is it crucial to maintain the recommended flow velocity in a grit chamber?

    <p>To prevent excessive organic matter accumulation (D)</p> Signup and view all the answers

    What is the primary purpose of preliminary treatment at most treatment plants?

    <p>To reduce the organic load in wastewater (A)</p> Signup and view all the answers

    Does pre-aeration improve settleability in the primary clarifier?

    <p>Yes, by increasing settleability (A)</p> Signup and view all the answers

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

    <p>Decreased settleability in the primary clarifier (C)</p> Signup and view all the answers

    What is the primary purpose of preliminary treatment at most treatment plants?

    <p>Protecting pumping equipment and preparing for subsequent treatment processes (B)</p> Signup and view all the answers

    Does pre-aeration improve settleability in the primary clarifier?

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

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

    <p>Decreased settleability of organic matter (A)</p> Signup and view all the answers

    How does excessive flow velocity affect the functioning of a grit chamber?

    <p>Reduces the removal of organic matter (B)</p> Signup and view all the answers

    What is the primary purpose of maintaining the recommended flow velocity in a grit chamber?

    <p>To improve settleability of organic matter (D)</p> Signup and view all the answers

    Why is it important to avoid appreciable organic matter collection in the grit of a wastewater treatment system?

    <p>It reduces the effectiveness of grit removal (A)</p> Signup and view all the answers

    What is the advantage of trickling filter over the activated sludge process?

    <p>Lower BOD removal efficiency (D)</p> Signup and view all the answers

    In the activated sludge process, what is the basic objective in the aeration basin?

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

    What is a sewer system designed to transport only wastewater from homes, industries, institutions, and businesses called?

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

    What is the advantage of activated sludge over trickling filter in terms of BOD removal efficiency?

    <p>Activated sludge has higher BOD removal efficiency than trickling filter (B)</p> Signup and view all the answers

    What is the balanced condition in the aeration basin of the activated sludge process called?

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

    What is a sewer system designed to transport only wastewater from homes, industries, institutions, and businesses called?

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

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

    <p>Higher risk of organic matter accumulation in the grit (B)</p> Signup and view all the answers

    Does pre-aeration improve settleability in the primary clarifier?

    <p>No (A)</p> Signup and view all the answers

    What is the primary purpose of preliminary treatment at most treatment plants?

    <p>To protect pumping equipment and facilitate subsequent treatment processes (D)</p> Signup and view all the answers

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

    <p>Decreased settleability of grit (C)</p> Signup and view all the answers

    Why is it important to avoid appreciable organic matter collection in the grit of a wastewater treatment system?

    <p>To prevent odors and corrosion (C)</p> Signup and view all the answers

    What is the primary purpose of preliminary treatment at most treatment plants?

    <p>To remove coarse solids and reduce organic matter (D)</p> Signup and view all the answers

    In the activated sludge process, what is the basic objective in the aeration basin?

    <p>To remove fine suspended solids (A)</p> Signup and view all the answers

    What is the advantage of trickling filter over the activated sludge process?

    <p>Lower BOD removal efficiency (D)</p> Signup and view all the answers

    What is the basic objective in the activated sludge process in the aeration basin?

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

    What is a sewer system designed to transport only wastewater from homes, industries, institutions, and businesses called?

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

    What type of matter is normally found in wastewater?

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

    What is the main objective of primary sedimentation in wastewater treatment?

    <p>Finely divided particles and dissolved organics removal (C)</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 (B)</p> Signup and view all the answers

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

    <p>Increased settling of organic matter in the grit (C)</p> Signup and view all the answers

    Does pre-aeration improve settleability in the primary clarifier?

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

    What is the primary purpose of preliminary treatment at most treatment plants?

    <p>To protect pumping equipment and facilitate subsequent treatment processes (C)</p> Signup and view all the answers

    What is the advantage of trickling filter over activated sludge in terms of BOD removal efficiency?

    <p>Trickling filter has lower BOD removal efficiency compared to activated sludge (A)</p> Signup and view all the answers

    In the activated sludge process, what is the basic objective in the aeration basin called?

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

    What is a sewer system designed to transport only wastewater from homes, industries, institutions, and businesses called?

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

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

    <p>Decreased efficiency in removing organic matter from the grit (D)</p> Signup and view all the answers

    Does pre-aeration improve settleability in the primary clarifier?

    <p>No, it has no impact on settleability (C)</p> Signup and view all the answers

    What is the primary purpose of preliminary treatment at most treatment plants?

    <p>To protect pumping equipment and facilitate subsequent treatment processes (B)</p> Signup and view all the answers

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

    <p>To evenly distribute the flow of wastewater entering the settling tank (B)</p> Signup and view all the answers

    What could happen if an excessive flow velocity is maintained in a grit chamber?

    <p>Erosion of collected grit and increased carryover (A)</p> Signup and view all the answers

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

    <p>Erosion of collected grit and carryover (A)</p> Signup and view all the answers

    What is the primary purpose of preliminary treatment at most treatment plants?

    <p>To remove large debris and grit from wastewater (B)</p> Signup and view all the answers

    What type of matter is normally composed of grit, sand, and silt in wastewater?

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

    What is the main objective of primary sedimentation in a wastewater treatment process?

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

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

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

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

    <p>Appreciable collection of organic matter (C)</p> Signup and view all the answers

    What is the primary purpose of preliminary treatment at most treatment plants?

    <p>Removal of large solids and grit (C)</p> Signup and view all the answers

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

    <p>Prevent the escape of treated water (B)</p> Signup and view all the answers

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

    <p>Impaired performance of downstream treatment units (D)</p> Signup and view all the answers

    What is the BOD removal efficiency comparison between trickling filter and activated sludge?

    <p>Trickling filter has lower BOD removal efficiency than activated sludge (C)</p> Signup and view all the answers

    What is the basic objective in the aeration basin of the activated sludge process?

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

    What is a sewer system designed to transport only wastewater from homes, industries, institutions, and businesses called?

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

    What type of matter is normally composed of grit, sand, and silt in wastewater?

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

    What is the main objective of primary sedimentation in a wastewater treatment process?

    <p>Finely divided particles and dissolved organics removal (A)</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 (B)</p> Signup and view all the answers

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

    <p>Increased settleability of organic matter in the grit (D)</p> Signup and view all the answers

    What is the primary purpose of pre-aeration in the context of the primary clarifier?

    <p>To improve the settleability of organic matter (B)</p> Signup and view all the answers

    What is the basic objective of preliminary treatment at most treatment plants?

    <p>Protecting pumping equipment and facilitating subsequent treatment processes (D)</p> Signup and view all the answers

    What is the basic objective in the activated sludge process?

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

    What is a sewer system designed to transport only wastewater from homes, industries, institutions, and businesses called?

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

    What is the advantage of trickling filter over the activated sludge in terms of BOD removal efficiency?

    <p>BOD removal efficiency of TF is typically lower than activated sludge (C)</p> Signup and view all the answers

    What type of matter is normally found in wastewater?

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

    What are the main objectives of primary sedimentation in wastewater treatment?

    <p>Finely divided particles and dissolved organics removal (D)</p> Signup and view all the answers

    What is the advantage of activated sludge over trickling filter in terms of BOD removal efficiency?

    <p>Activated sludge has a higher BOD removal efficiency than trickling filter (B)</p> Signup and view all the answers

    What is the basic objective in the activated sludge process?

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

    What is a sewer system designed to transport only wastewater from homes, industries, institutions, and businesses called?

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

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

    <p>Increased organic matter collection in the grit (C)</p> Signup and view all the answers

    What is the main purpose of pre-aeration in improving settleability in the primary clarifier?

    <p>Reducing settleable solids in the clarifier (A)</p> Signup and view all the answers

    What is the primary purpose of preliminary treatment at most treatment plants?

    <p>To protect downstream treatment processes (D)</p> Signup and view all the answers

    Where is the media in trickling filters typically placed?

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

    Which organisms are primarily responsible for treating wastewater in the trickling filter process?

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

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

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

    What type of matter is normally found in wastewater?

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

    What are the main objectives of primary sedimentation in a wastewater treatment process?

    <p>Settleable solids and floatables removal (C)</p> Signup and view all the answers

    What is the major purpose of pre-aeration in improving settleability in the primary clarifier?

    <p>To reduce velocity and disperse the flow (C)</p> Signup and view all the answers

    What is the advantage of trickling filter over activated sludge in terms of BOD removal efficiency?

    <p>Higher efficiency in removing BOD (C)</p> Signup and view all the answers

    In the activated sludge process, what is the balanced condition in the aeration basin called?

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

    What is a sewer system designed to transport only wastewater from homes, industries, institutions, and businesses called?

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

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