copyright © 2005 royceu.com … all rights reserved

1. Sludge dewatering is a process where:

   1.   ?    Microorganisms are removed
   2.   ?    Water is removed from a liquid/solids suspension
   3.   ?    Microorganisms are destroyed
   4.   ?    Volatile solids are stabilized

2. The concept of sludge dewatering is to:

   1.   ?    Increase total solids concentration
   2.   ?    Decrease total solids concentration
   3.   ?    Has no change at all in solids concentration
   4.   ?    Convert suspended solids into settleable solids

3. The discharge from the belt press is:

   1.   ?    Powered residue
   2.   ?    Liquid
   3.   ?    Sludge cake
   4.   ?    5% Solids

4. The water removed by the belt press is called:

   1.   ?    Mixed liquor
   2.   ?    Effluent
   3.   ?    Filtrate
   4.   ?    Cake

5. The inlet conditioning process mixes the sludge with:

   1.   ?    Polymer
   2.   ?    Chlorine
   3.   ?    Lime
   4.   ?    Washwater

6. The pressure filtration stage of dewatering takes place as the loosely structured cake is:

   1.   ?    Liquefied
   2.   ?    Expanded
   3.   ?    Compressed
   4.   ?    Washed

7. The primary function of polymer is to:

   1.   ?    Decrease solids content
   2.   ?    Promote rapid water release (desorption)
   3.   ?    Sterilize the microorganisms
   4.   ?    Reduce the ammonia content

8. The main function of a hydraulic power unit is to:

   1.   ?    Supply oil to drive the belt tension and steering circuits on the press
   2.   ?    Supply sludge to the belt press
   3.   ?    Distribute sludge to the belt press
   4.   ?    Decrease temperature of the sludge

9. A fast belt speed may cause:

   1.   ?    Smaller floc
   2.   ?    Good gravity filtration and higher cake solids
   3.   ?    Poor gravity filtration and lower cake solids
   4.   ?    Decrease productive output

10. A slow belt speed may cause:

    1.   ?    Larger floc
    2.   ?    Good gravity filtration and higher cake solids
    3.   ?    Poor gravity filtration and lower cake solids
    4.   ?    Decrease the gravity section % solids

11. Venturi mixers are designed to:

    1.   ?    Mix sludge and washwater
    2.   ?    Mix sludge and polymer
    3.   ?    Shear floc
    4.   ?    Create floc

12. Usually, closing the venturi mixer arm will:

    1.   ?    Create a smaller floc
    2.   ?    Create a larger floc
    3.   ?    Not affect floc size
    4.   ?    Decrease mixing energy

13. Pick one potential problem with reducing the pressure zone tension too much:

    1.   ?    Belt may become stretched
    2.   ?    Belts may blind
    3.   ?    Belts may fold and crease
    4.   ?    Belts may break

14. Will hydraulic pressure be higher or lower or no change in the early morning?

    1.   ?    Lower
    2.   ?    Higher
    3.   ?    No change

15. Which device is used to promote cake release in the discharge zone?

    1.   ?    Mooning bar
    2.   ?    Safety cable
    3.   ?    Steering assembly
    4.   ?    Doctor blade

16. Polymer with a positive charge is called?

    1.   ?    Non-ionic
    2.   ?    Anionic
    3.   ?    Cationic
    4.   ?    Reverse negative

17. Which type of polymer usually requires more mixing and aging time?

    1.   ?    Water base
    2.   ?    Dry powder
    3.   ?    Dispersion
    4.   ?    Emulsion

18. Very high belt tension pressure can cause:

    1.   ?    Belts to blind
    2.   ?    Increased life of belts
    3.   ?    Belt speed to become too fast
    4.   ?    Filtrate quality to improve

19. When starting a belt press filter press, you should:

    1.   ?    Start feeding sludge before washwater is initiated
    2.   ?    Start feeding polymer 10 minutes before initiating sludge feed
    3.   ?    Initiate washwater before sludge feed is started
    4.   ?    Set the hydraulic pressure to 700 psi

20. When sludge streaks are appearing on the belts, what should be done?

    1.   ?    Clean the wash box nozzles
    2.   ?    Increase the pressure zone tension
    3.   ?    Decrease the washwater pressure
    4.   ?    Increase the feed sludge flow

21. In a properly operated belt filter press, what is a typical solids content of the gravity section sludge?

    1.   ?    1 to 2% TS
    2.   ?    15 to 20% TS
    3.   ?    4 to 8% TS
    4.   ?    20 to 25% TS

22. What does this formula represent?
    
    (lbs/day sludge feed - lbs/day sidestream) / lbs/day sludge feed x 100
    

    1.   ?    Polymer dosage rate
    2.   ?    Percent capture efficiency
    3.   ?    Throughput production
    4.   ?    Filtrate to feed ratio

23. Gravity section is flooding! What could cause this? select only one answer

    1.   ?    Sludge feed rate is too low
    2.   ?    Belts are blinded
    3.   ?    Improper polymer conditioning
    4.   ?    Belt speed is too high
    5.   ?    b and c

24. How will a fast belt speed typically affect cake solids concentration?

    1.   ?    Produce higher solids content
    2.   ?    Produce lumpy sludge
    3.   ?    Produce lower solids content
    4.   ?    Produce window piles of thick sludge

25. How will a slow belt speed affect gravity section sludge concentration?

    1.   ?    Produce higher solids content
    2.   ?    Produce lumpy sludge
    3.   ?    Produce lower solids content
    4.   ?    Produce window piles of thick sludge