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 Population Equivalent Calculation and Water Filter Headloss. This time you can test your knowledge about chlorine cylinder use and fluoride calculation.
Wastewater Treatment Sample Question
When using a 1-ton chlorine cylinders (tanks), where is the connection made to remove liquid chlorine?
A. Top valve
B. Bottom valve
C. Either top or bottom valve
D. Both top and bottom valves
Water Treatment Sample Question
Using following information, calculate the percentage of fluoride ion in 23% pure H2SiF6. Hydrogen = 1.00784 atomic weight. Silicon = 28.0855 atomic weight. Fluorine = 19.998403 atomic weight.
A. 23%
B. 18%
C. 79%
D. 56%
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.
