Exam Study Guide: Sequencing Batch Reactors and Chlorine Gas Withdraw Rate

Maintaining your education is important, especially in a career that demands licensing exams. Prove you’re an expert operator by answering these questions and others from our Exam Study Guide Series.

Exam Study Guide: Sequencing Batch Reactors and Chlorine Gas Withdraw Rate

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 Aeration Basin Conditions and PFAS Chemicals. This time you can test your knowledge about sequencing batch reactors and chlorine gas withdraw rate.

Wastewater Treatment Sample Question

At what stage is wasting accomplished when operating a Sequencing Batch Reactor (SBR)?

A. Immediately  after the react stage
B. During the react stage (approximately halfway through the stage)
C. During the decant stage 
D. During the idle stage

Water Treatment Sample Question

What is the maximum chlorine gas withdraw rate from a 150-pound cylinder?

A. 150 pounds per day
B. 75 pounds per day
C. 40 pounds per day
D. 25 pounds per day

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.


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