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 Activated Sludge Process Variables; and Distribution System Piping. This time you can test your knowledge about
Wastewater Treatment Sample Question
When operating a rotary-type distribution trickling filter, what is the recommended method of meeting satisfactory dosing rates during low-flow conditions?
A. Re-calculate the dose rate
B. Add additional trickling filter units to meet flow conditions
C. Reduce the amount of trickling filter units to meet flow conditions
D. Increase recirculation rates to increase flow and maintain dosing rate
Water Treatment Sample Question
What is the upper level of a thermally stratified lake called?
A. Hypolimnion
B. Thermocline
C. Metalimnion
D. Epilimnion
To see the answers to both the above questions, click this link.
About the authors: Rick Lallish is the Water Pollution Control program director at the Environmental Resources Training Center (ERTC) 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.
Drew Hoelscher is the program director of drinking water operations at the Environmental Resources Training Center in Edwardsville, Illinois.
