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 Collections System Failure and CT Value. This time you can test your knowledge about pipe-wall bacteria and chemical water softening.
Wastewater Treatment Sample Question
Hydrogen sulfide is oxidized to sulfuric acid by what bacteria, common in pipe walls in collection systems and lift station wet wells?
A. Nocardiar
B. Thiobacillus
C. Thiothrix
D. Autotrophicis
Water Treatment Sample Question
What chemical can be used in place of calcium hydroxide and sodium carbonate for softening?
A. Sodium chloride
B. Sodium sulfate
C. Sodium hydroxide
D. Calcium sulfate
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.
