Coagulation And Flocculation: Water Treatment Plant Operation Quiz

50 Questions | Total Attempts: 4505

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Coagulation And Flocculation: Water Treatment Plant Operation Quiz


Questions and Answers
  • 1. 
    Smaller sized particles, such as bacteria and fine clays andsilts, readily settle out of water.
    • A. 

      True

    • B. 

      False

  • 2. 
    The theory of coagulation is very simple.
    • A. 

      True

    • B. 

      False

  • 3. 
    The operator has effective control over the pH and alkalinity of the source water.
    • A. 

      True

    • B. 

      False

  • 4. 
    Overdoing as well as underdosing of coagulants may lead to reduced solids removal efficiency.
    • A. 

      True

    • B. 

      False

  • 5. 
    Coagulation is slow stirring process that causes the gathering together of small, coagulated particles into larger, settleable particles.
    • A. 

      True

    • B. 

      False

  • 6. 
    The solids-contact process (upflow clarifiers) combine the coagulation, flocculation, and sedimentation processes into a single basin.
    • A. 

      True

    • B. 

      False

  • 7. 
    The measurement of filtered water turbidity will give theoperator a good indication of overall process performance.
    • A. 

      True

    • B. 

      False

  • 8. 
    Visual observations and laboratory tests of coagulation-flocculation process performance should be performed on a routine basis.
    • A. 

      True

    • B. 

      False

  • 9. 
    The jar test exactly duplicates the flow-through conditions that are occurring in your treatment plant.
    • A. 

      True

    • B. 

      False

  • 10. 
    A good practice is to prepare jar test reagents using samples of the chemicals actually used in the plant, rather than reagent grade chemicals.
    • A. 

      True

    • B. 

      False

  • 11. 
    Most of the sludge volume from the coagulation-flocculation process consists of precipitates of the added chemicals rather than suspended solids (turbidity) removed.
    • A. 

      True

    • B. 

      False

  • 12. 
    After evaluation of the jar test results, apply the dosage used to achieve the best jar test results to your water treatment plant operation
    • A. 

      True

    • B. 

      False

  • 13. 
    If the water has milky appearance of a bluish tint, the alum dose is probably too high.
    • A. 

      True

    • B. 

      False

  • 14. 
    Excessive mixing speeds, mixing time, and the buildup of heat can break down the polymer chain and reduce its effectiveness.
    • A. 

      True

    • B. 

      False

  • 15. 
    The colloidal and dissolved organics found in some natural waters are the end products of decayed vegetable matter.
    • A. 

      True

    • B. 

      False

  • 16. 
    In the enhanced coagulation process, optimum dosages for acid, alkalinity, and coagulant are determined by performing a series of jar test.
    • A. 

      True

    • B. 

      False

  • 17. 
    Do not allow any untreated water to flow through your plant.
    • A. 

      True

    • B. 

      False

  • 18. 
    Good records of actions taken during start-up/shutdown operations will assist the operator in conducting future start-ups/shutdowns.
    • A. 

      True

    • B. 

      False

  • 19. 
    Samples should be analyzed as soon as possible after the sample is collected.
    • A. 

      True

    • B. 

      False

  • 20. 
    Good record keeping is the key to a successful preventive maintenance program.
    • A. 

      True

    • B. 

      False

  • 21. 
    What are polymers?
    • A. 

      Long chain molecules formed by the union of many monomers

    • B. 

      Very small, finely divided solids that remain dispersed in a liquid for a long time due to their small size and electrical charge

    • C. 

      Very small solids suspended in water which can vary widely in size, shape, density, and electrical charge

    • D. 

      Very small solids that settle out of the water being treated

  • 22. 
    What is the purpose of coagulation and flocculation?
    • A. 

      To control corrosion

    • B. 

      To filter out suspended particles

    • C. 

      To remove particulate impurities, especially nonsettleable solids, and color from the water being treated

    • D. 

      To settle our larger suspended particles

  • 23. 
    What is alkalinity?
    • A. 

      A laboratory procedure used to estimate the minimum or ideal coagulant dose required to achieve certain water quality goals

    • B. 

      A process used to kill disease-causing organisms

    • C. 

      A solution or liquid whose chemical makeup neutralizes acids or bases without a great change in pH

    • D. 

      The capacity of water to neutralize acids

  • 24. 
    What is the purpose of the flocculation process?
    • A. 

      To clarify the water being treated prior to treatment by the sedimentation and filtration processes

    • B. 

      To create a floc of a good size, density, and toughness for later removal in the sedimentation and filtration processes

    • C. 

      To flocculate the water being treated in a timely manner

    • D. 

      To prevent solids settling out in the flocculation basin

  • 25. 
    What is the most important consideration in coagulation-flocculation process control?
    • A. 

      Adjusting the alkalinity

    • B. 

      Keeping the floc in suspension

    • C. 

      Maintaining a constant pH

    • D. 

      Selection of the proper type and amount of coagulant chemical(s) to be added to the water being treated

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