Exam Study Guide: Primary Treatment

Exam Study Guide: Primary Treatment

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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:

What is the expected suspended solids and BOD removal in percent from a primary sedimentation tank?

A) 0-15 percent TSS and 80-85 percent BOD

B) 25-30 percent TSS and 50-60 percent BOD

C) 40-50 percent TSS and 40-50 percent BOD

D) 50-65 percent TSS and 25-35 percent BOD


The suspended solids and BOD removal expectancies of a primary sedimentation tank depend on many variables, but typically removal ranges from 50-65 percent TSS and 25-35 percent BOD. Therefore, the answer is D.

Source: WEF MOP11 19-17

About the author
Ricky 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.


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