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 Duckweed Control and Hydroxide Alkalinity Calculations. This time you can test your knowledge about upstream screening requirements and holoacetic acid sample preservation.
Wastewater Treatment Sample Question
While using membrane biological reactors, what is typically required for upstream screening requirements?
A. Stringent pre-treatment standards for all industrial users
B. Primary clarification followed by ultraviolet pre-treatment
C. 1- to 3-millimeter fine screens for larger particles and debris
D. Pre-aeration in the grit chamber followed by primary clarification
Water Treatment Sample Question
What chemical is used for haloacetic acid (HAA) sample preservation?
A. Sodium sulfite
B. Sodium thiosulfate
C. Ascorbic acid
D. Ammonium chloride
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.
