Certification Quiz
Test Your Knowledge of Nutrient Removal
True or False
1. T F Nitrification is the process in which organisms assimilate nitrogen gas, making it available to other organisms.
2. T F Trickling filters use cyclic aeration to nitrify and denitrify wastewater.
3. T F Following acid digestion of the Kjeldahl method, organic nitrogen is converted to ammonium ions.
4. T F Denitrification processes show more slowing due to cold temperatures than enhanced biological phosphorus removal, nitrification, or sedimentation.
Multiple Choice
5. Which of the following choices is the primary parameter used for control of the activated sludge nitrification process?
a. Dissolved oxygen concentration.
b. Food-to-microorganism ratio.
c. Hydraulic retention time.
d. Solids retention time.
6. Which of the following kinds of phosphorus should operators monitor in plant influent?
a. Soluble phosphorus.
b. Biodegradable phosphorus.
c. Total phosphorus.
d. Poly-phosphorus.
7. Which of the following is the primary source of carbon used for denitrification in the modified Ludzack-Ettinger (MLE) process?
a. Methanol.
b. Carbon dioxide.
c. BOD5 in influent wastewater.
d. Endogenous respiration.
8. What is the best volatile fatty acid to support enhanced biological phosphorus removal?
a. Formic acid.
b. Acetic acid.
c. Valeric acid.
d. Butyric acid.
Questions excerpted from Biological Nutrient Removal Operation Study Guide and reviewed by the Association of Boards of Certification (Ames, Iowa) Validation and Examination Committee.
Answer Key (Highlight black box to reveal answers)
Answer Key
1. False. Nitrification is the oxidation of ammonia to nitrate–nitrogen. Nitrogen fixation is the process that makes nitrogen gas available to other organisms.
2. False.
3. True.
4. False. Nitrification is the most sensitive to cold temperatures.
5. d.
6. c.
7. c.
8. b. |
References
Water Environment Federation and American Society of Civil Engineers/Environmental and Water Resources Institute (2005). Biological Nutrient Removal Operation Study Guide. Alexandria, Va.: Water Environment Federation.
©2007 Water Environment Federation. All rights reserved.
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