January 2008, Vol. 20, No.1

Certification Quiz

Test Your Knowledge of Fats, Oils, and Grease

    True or False Questions:
  1. Hydraulic residence time is another term for hydraulic retention time.
  2. Petroleum-based oils are considered nonpolar.
  3. Freon-113 is a U.S Environmental Protection Agency approved solvent for the FOG extraction test.
  4. Thorough and regular cleaning of lines is essential in reducing future FOG restrictions.
  5. The best way to clean grease spilled on a food service establishment floor is to hose the floor immediately.
  6. The best time to talk to a food service establishment manager about his grease best management practices (BMPs) would be during the lunch rush hour.
  7. Once installed, grease control equipment needs no further maintenance.

  8. Multiple Choice Questions:
  9. Which sampling technique must be used when reporting the FOG results on a DMR?

  10. A. Time composite sample.
    B. Flow proportional sample.
    C. Time-weighted sample.
    D. Grab, instantaneous sample.

  11. If a WWTP’s most significant industrial user is a milk chocolate candy manufacturer with inadequate pretreatment, what type of pollutant load would most likely exist?

  12. A. High BOD, low FOG.
    B. Low BOD, low FOG.
    C. High BOD, high FOG.
    D. Low BOD, high FOG.

  13. What type of equipment receives an API certification?

  14. A. FOG generation equipment.
    B. Biological treatment technologies
    C. Advanced chemical treatment technologies.
    D. Oil/water separators.

  15. What does the acronym API stand for?

  16. A. Association of Plumbing Inspectors.
    B. American Petroleum Institute.
    C. Affiliation of Petroleum Investigators.
    D. None of the above.

  17. When referring to the wastewater flow in a grease interceptor, what does the term short-circuit mean?

  18. A. A bare electrical wire in contact with the grease interceptor.
    B. A minimal wastewater flow through the interceptor.
    C. A wastewater flow directed over the baffle wall.
    D. A wastewater flow from the influent chamber not restricted by channeling devices such as tees from direct discharge to the effluent chamber.

  19. How is a flow restrictor used for FOG treatment at a food service establishment?

  20. A. A device installed prior to the grease trap that restricts the flow to the grease trap to a prescribed volume per unit time.
    B. A device that limits the water flow to a food service establishment.
    C. A device that restricts the flow from a grease interceptor.
    D. A device that reduces the water pressure in a commercial dishwasher.

  21. What is an important consideration for installing a grease interceptor at a food service establishment?

  22. A. Proper sizing.
    B. Proper components (inlet configuration, outlet configuration, etc.).
    C. Proper maintenance.
    D. All of the above.

Questions were developed by the Water Environment Federation FOG/Pretreatment Subcommittee and reviewed by the Association of Boards of Certification (Ames, Iowa) Validation and Examination Committee.

Answer Key:
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Water Environment Federation (1994). Pretreatment of Industrial Wastes; Manual of Practice No. FD-3. Alexandria, Va.: Water Environment Federation.

Metcalf & Eddy Inc., George Tchobanoglous, Franklin L. Burton, and H. David Stensel (2003). Wastewater Engineering: Treatment Disposal Reuse; 4th edition. New York: McGraw-Hill Companies.

Federal Register Vol. 72, No. 47, Monday March 12, 2007.