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 Settleometer Tests and Public Notification Requirements. This time you can test your knowledge about secondary clarifier denitrification and new groundwater sources.
Wastewater Treatment Sample Question
Denitrification in the secondary clarifier is undesirable. Which of the following is the best method of minimizing denitrification of secondary clarifier sludge?
A. Proper wasting methods
B. Proper RAS controls
C. Maintaining elevated SRT levels
D. Maintaining higher HRT levels
Water Treatment Sample Question
New groundwater sources are:
A. Required to conduct triggered source water monitoring as required by the Surface Water Treatment Rule and/or maintain two-log inactivation for viruses.
B. Required to conduct triggered source water monitoring as required by the Surface Water Treatment Rule and/or maintain log inactivation for viruses.
C. Required to conduct triggered source water monitoring as required by the Ground Water Rule and/or maintain two-log inactivation for viruses.
D. Required to conduct triggered source water monitoring as required by the Ground Water Rule and/or maintain four-log inactivation for viruses.
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 (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.
