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 Threats to Lagoons and Mechanical Seals. This time you can test your knowledge about proper grab sampling and volume calculations.
Wastewater Treatment Sample Question
What laboratory tests must be done on grab samples?
A. Biochemical oxygen demand
B. pH
C. Total suspended solids
D. Total nitrogen
Water Treatment Sample Question
Using a flow rate of 600 gpm and a detention time of four hours, calculate the volume of the basin in gallons.
A. 2,400 gallons
B. 9,000 gallons
C. 144,000 gallons
D. 17,952 gallons
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.
Drew Hoelscher is the program director of drinking water operations at the Environmental Resources Training Center in Edwardsville, Illinois.
