Welcome back to TPO magazine's Exam Study Guide Series, which offers a pair of water/wastewater study questions with in-depth explanations of the answers.
TPO would like to thank the former author of the study questions on the water side, Drew Hoelscher, for his years of service to the Exam Study Guide Series. And we'd also like to extend a warm welcome to Ron Trygar, program manager for water and wastewater at the University of Florida Training, Research and Education for Environmental Occupations (TREEO) Center.
Last time, we covered a set of wastewater and drinking water treatment questions on the topics of Manhole Locations and Temperature Calculations. This time you can test your knowledge about optimal bacterial growth conditions and water membrane classifications.
Wastewater Treatment Sample Question
What is the “carbon:nitrogen:phosphorus” ratio required for bacterial growth?
A. 200:50:25
B. 1:5:1000
C. 100:10:20
D. 100:5:1
Water Treatment Sample Question
Which membrane classification can be used for softening water containing calcium and magnesium ions and to reduce the concentration of natural organic matter?
A. Ultrafiltration (UF)
B. Microfiltration (MF)
C. Nanofiltration (NF)
D. Reverse osmosis (RO)
To see answers for both of the above questions, click this link.
About the authors: Rick Lallish is the Water Pollution Control program director at the Environmental Resources Training Center of Southern Illinois University-Edwardsville. He provides training for entry-level operators in the wastewater field and operators throughout the state looking to further their education. Lallish was also named the 2017 Illinois Operator of the Year and 2018 president of the Illinois Association of Water Pollution Control Operators.
Ron Trygar is the program manager for water and wastewater at the University of Florida Training, Research and Education for Environmental Occupations (TREEO) Center. He is also a certified master environmental trainer through the National Environmental Safety and Health Training Association.
