Exam Study Guide: Wastewater Sample Testing and Chemical Dilutions

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: Wastewater Sample Testing and Chemical Dilutions

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 Pump Switches and Pump Shaft Rotation. This time you can test your knowledge about wastewater sample testing, and chemical dilutions.

Wastewater Treatment Sample Question

What test is done on influent and effluent samples to determine volume of solids removed in clarifiers or ponds? What apparatus is used to run this analysis?

A. Total suspended solids, crucibles
B. Acid to alkalinity, beakers 
C. Settleable solids, Imhoff cones
D. Settleability, settleometers

Water Treatment Sample Question

What is the percent strength in the solution mixing tank if an operator added 96 gallons of chemical to 700 gallons of water?

A. 13.7%
B. 12.1%
C. 8.3%
D. 7.3%

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 (ERTC) 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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