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 Mean Cell Residence Time and Water Separation Processes. This time you can test your knowledge about aerobic digestion and water filtration processes.
Wastewater Treatment Sample Question
What is the main problem found when aerobically digesting primary sludge?
A. Increased amounts of endogenous respiration
B. To maintain DO levels, more air is required
C. Loss of microorganism growth required for endogenous respiration
D. Primary sludge should never be fed to an aerobic digester
Water Treatment Sample Question
The passage of a liquid containing dissolved solids and salts through a semipermeable membrane at elevated pressure to become a less concentrated solution is known as which process listed below?
A. Ultrafiltration
B. Osmosis
C. Reverse osmosis
D. Gravity filtration
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.
Ron Trygar is the program manager for water and wastewater at the University of Florida Training, Research and Education for Environmental Occupations (TREEO) Center. He is also a certified master environmental trainer through the National Environmental Safety and Health Training Association.
