Exam Study Guide: Wastewater Measuring Devices

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When faced with a licensing exam, don't struggle with test anxiety! Use the question below and others from our Exam Study Guide series to properly study and prepare for exam questions. Take a look at this sample wastewater treatment licensing question along with an explanation of the correct answer.

Sample question: Which two measuring devices are used in wastewater treatment?

A) Nutrating disk and piston meters
B) V-Notch weirs and Parshall flumes
C) Venturi meters and compound meters
D) None of the above

Mechanical measuring devices cannot be used in wastewater treatment for two reasons: First of all, solids can plug or prohibit accurate measurement using mechanical metering devices and also because of the corrosive nature of wastewater flows.

Therefore, to measure the flows in a wastewater treatment operation, we must rely on mathematical practices using devices that allow for a constant velocity but can accommodate a change in surface area. Both the Parshall flume, which is used for influent and effluent flow measurements and is designed to the Q/AV formula (Flow/Area X velocity), and V-Notch weirs, which are used at intermittent locations through the facility — primary and secondary clarifiers — can meet these needs.

The correct answer is B.

About the author

Mike Smith is program coordinator and lead faculty of the Water Quality Management program at Red Rocks Community College in Lakewood, Colo.

He has been in charge of the multifaceted training program since 1996.


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