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.
Last time, we covered a set of wastewater and drinking water treatment questions on the topics of Aerobic Digestion and Water Filtration Processes. This time you can test your knowledge about gravity belt thickeners and semipermeable membranes.
Wastewater Treatment Sample Question
With proper conditioning, what suspended solids concentrations can you expect from a gravity belt thickener?
A. 1-3%
B. 4-6%
C. 8-12%
D. 4-28%
Water Treatment Sample Question
The water flow through a semipermeable membrane that is commonly expressed as gallons per square foot per day of membrane surface is known as which term listed below?
A. Mineral rejection
B. Recovery
C. Concentrate production
D. Flux
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.
