Exam Study Guide: Laboratory Procedures; and Dissolved Oxygen Concentration

Maintaining your education is important, especially in a career that demands licensing exams. Prove you’re an expert operator by answering these questions and others from our Exam Study Guide Series.

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 Lagoon Types; and Rate of Flow Controllers. This time you can test your knowledge about laboratory procedures, and dissolved oxygen concentration.

Wastewater Treatment Sample Question

Where may an operator look to find specific laboratory procedures and the proper compliance for those procedures?

A. NPDES permit
B. Wastewater textbooks such as the OWP’s Operation of Wastewater Treatment Plants 
C. Plant Standard Operating Procedures (SOP)
D. WEF guidelines and procedures

Water Treatment Sample Question

At what water temperature would an operator expect the highest dissolved oxygen concentration in mg/L?

A. 50 degrees C
B. 30 degrees C
C. 10 degrees C
D. 0 degrees C

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.


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