Preparing for a water or wastewater licensing exam? Give this sample question a try.


When faced with a licensing exam, don't struggle with test anxiety! Use the question below and others from our Exam Study Guide series to properly study and prepare for exam questions. Take a look at this sample wastewater treatment licensing question along with an explanation of the correct answer.

Sample question:

What type of plant is required to make provisions for warning of potential explosions that could result from the presence of combustible gases from wastewater?

Related: Exam Study Guide: Water Treatment Safety

A) Orbal oxidation ditch
B) Sequencing batch reactor
C) Contact stabilization
D) High-purity oxygen

Answer: The answer is high-purity oxygen, D. Precautions are also taken in selective construction materials because of the corrosive and reactive nature of the oxygen-CO2 gases.

Source: WEF MOP11 20-21

Related: Exam Study Guide: Problem Solving

About the author
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.


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