Water Treatment Plant Operation Volume 2 Chapter 16

35 Questions | Total Attempts: 633

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Water Treatment Plant Operation Volume 2 Chapter 16

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Questions and Answers
  • 1. 
    All available water supplies can be classified according to mineral quality 
    • A. 

      True

    • B. 

      False

  • 2. 
    Osmosis is the passage of a fluid from a weak solution into a more concentrated solution across a semipermeable membrane 
    • A. 

      True

    • B. 

      False

  • 3. 
    The water permeable (a) and the mineral permeability (b) Constance a characteristics of the particular membrane that is used in the processing it received 
    • A. 

      True

    • B. 

      False

  • 4. 
    The water flux increases is mineral count content of the feed increases because the osmotic pressure contribution increases with increasing mineral content 
    • A. 

      True

    • B. 

      False

  • 5. 
    Under ideal condition for a reverse osmosis unit (pure feed water and no fouling of the membrane surface), there is no change in water flocks with time 
    • A. 

      True

    • B. 

      False

  • 6. 
    With a reverse osmosis unit, divalent ions, such as calcium and sulfate, are better rejected than monovalent ions such as sodium and chloride 
    • A. 

      True

    • B. 

      False

  • 7. 
    In the reverse osmosis operation as the temperature of the water increases, flux decreases 
    • A. 

      True

    • B. 

      False

  • 8. 
    Water is transmitted through the membrane and a much more rapid rates than minerals 
    • A. 

      True

    • B. 

      False

  • 9. 
    Reverse osmosis modules provide a large surface area for the attachment and growth of bacterial slams and molds 
    • A. 

      True

    • B. 

      False

  • 10. 
    When operating an electrodialysis unit, any process problems discovered must be acted upon immediately 
    • A. 

      True

    • B. 

      False

  • 11. 
    What is the term flux used to describe 
    • A. 

      The feasibility of the membrane to remove salinity

    • B. 

      The flexibility of the semipermeable membrane

    • C. 

      The fluctuations in flow through the semipermeable membrane

    • D. 

      The rate of water flow to miss any permeable membrane

  • 12. 
    What could be the cause of a decrease in flux in a reverse osmosis unit 
    • A. 

      Membrane compaction

    • B. 

      Membrane expansion

    • C. 

      Membrane maintenance

    • D. 

      Membrane temperature differential

  • 13. 
    What is the purpose of demineralization 
    • A. 

      To Deionize water

    • B. 

      To determine water hardness

    • C. 

      To recover and recycle minerals

    • D. 

      To separate minerals from water

  • 14. 
    How is recovery defined demineralization process 
    • A. 

      The amount of minerals recovered for products sale

    • B. 

      The percentage of feed flow that is recovered as product water

    • C. 

      The percentage of feed salinity that is recovered as reject

    • D. 

      The return of the membrane to original performance levels

  • 15. 
    Why is acid added as a pretreatment step before demineralization and using cellulose acetate membranes 
    • A. 

      To control corrosiveness

    • B. 

      To increase hydrolysis

    • C. 

      To reduce compaction

    • D. 

      To slow hydrolysis

  • 16. 
    What is concentrated polarization 
    • A. 

      A buildup of retained particles on the membrane surface due to be watering of the feed closest to the membrane

    • B. 

      A concentration of minerals and the reject or recovery water

    • C. 

      In mixing of water stew neutralize (polarize) the ionic content of the water

    • D. 

      A polarization of minerals and the reject or recovery water

  • 17. 
    What is the most common serious problem resulting from concentration polarization 
    • A. 

      Compaction of the membrane

    • B. 

      Increasing tendency of precipitation of sparingly soluble salts and deposition of particle matter on the membrane surface

    • C. 

      Leakage of salts and particulate matter through the membrane

    • D. 

      Reduction and maintenance requirements

  • 18. 
    Provisions should be made for flushing reverse osmosis units under what conditions 
    • A. 

      When consumers complain of flavor and older problems

    • B. 

      When iron bacteria cause rust or orange and water problems

    • C. 

      When necessary to comply with a lead and copper rule

    • D. 

      When treating seawater brackish water with high organic content

  • 19. 
    Which scale inhibitor is most frequently used to prevent the coding of the reverse osmosis membrane 
    • A. 

      None ionic polymer

    • B. 

      Soda ash

    • C. 

      Sodium hexametaphosphate

    • D. 

      Sulfuric acid

  • 20. 
    What is the most common problem in Electrodialysis (ED) operation 
    • A. 

      Compacting of the membrane due to lack of washing

    • B. 

      Corroding the membrane by an acidic solutions

    • C. 

      Scaling or fouling of the membrane by both organic and inorganic materials

    • D. 

      Tearing of the membrane by abrasive materials tearing of the membrane by abrasive materials

  • 21. 
    Which factors are contributing to The increased salinity of many rivers and lakes
    • A. 

      Agricultural runoff

    • B. 

      Coagulation/flocculation

    • C. 

      Filtration

    • D. 

      Moisture condensation

    • E. 

      Waste discharge

  • 22. 
    What are the advantages of thin-film composite membranes when comparing with cellulose acetate membranes
    • A. 

      Higher costs

    • B. 

      Higher rejection And flux rate

    • C. 

      Lower salt passage rate increase after three years

    • D. 

      Subject to biological attack

    • E. 

      Subject to hydrolysis or compaction

  • 23. 
    The mineral(salt) flux (mineral passage)Through a membrane depends on which factors
    • A. 

      Concentration gradient across the membrane

    • B. 

      Mineral permeability constant

    • C. 

      Osmotic pressure differential across the membrane

    • D. 

      Pressure differential applied across the membrane

    • E. 

      Water permeability constant

  • 24. 
    Which impurities can be deposited or the grow on the membrane surface of a reverse osmosis unit
    • A. 

      Alkalinity

    • B. 

      Bacteria

    • C. 

      Dissolved in organics

    • D. 

      Dissolved organics

    • E. 

      Suspended solids

  • 25. 
    Where should something about be located on reverse osmosis
    • A. 

      On the concentrate line

    • B. 

      On the feed line

    • C. 

      On the permeate line

    • D. 

      On the permeated line of the pressure vessel

    • E. 

      On the work bench of each lap technician

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