Exam Study Guide: BOD Readings and Venturi Meters

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: BOD Readings and Venturi Meters

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 Wet Scrubber Odor Control and Ion Exchange Treatment. This time you can test your knowledge about BOD readings and venturi meters.

Wastewater Treatment Sample Question

Given the following data:

Analyzing BOD readings of raw influent 10 ml samples 
Initial DO reading sample 1: 8 mg/L
Final DO reading sample 1: 1.4 mg/L
Initial DO reading sample 2: 8 mg/L
Final DO reading sample 2: 1.6 mg/L

What is the average BOD reading for this sample? This is an unseeded BOD test.

A.  192 mg/L BOD
B. 195 mg/L BOD
C. 198 mg/L BOD
D. 390 mg/L BOD

Water Treatment Sample Question

How does a venturi meter measure flow?

A. The velocity of water causes a propeller or turbine to rotate
B. Utilizes the voltage created between two electrodes as the water passes through
C. Measures the difference in pressure from two separate points
D. An electronic transducer measures the velocity of a sound wave and translates to flow volume

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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