Exam Study Guide: Lagoon Walk-Throughs and Aging Water Samples

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.

Exam Study Guide: Lagoon Walk-Throughs and Aging Water Samples

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 Low-Flow Dosing Rates; and Thermally Stratified Lakes. This time you can test your knowledge about lagoon walk-throughs and aging water samples.

Wastewater Treatment Sample Question

While performing a daily walk-through at an aerated lagoon treatment plant, you notice surface bubbling throughout the primary lagoon, except in one area. In this area, the surface is calm and uninterrupted. What is the most probable issue?

A. Blue-green algae has taken over the lagoon
B. Diffuser is plugged or fouled
C. Filamentous bacteria have begun to take over
D. Rip-rap has failed in this area

Water Treatment Sample Question

Using the data in the table, what sample is most likely representing the oldest water?

A. Sample A
B. Samble B
C. Sample C
D. Sample D

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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