Exam Study Guide: Activated Sludge Systems

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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:

A plant that resembles a long narrow aeration tank that receives the heaviest loading at the front end of the tank and decreases as flow moves through the tank is known as what type of system?

A) Contact stabilization system

B) Bardenpho system

C) Plug flow system

D) Complete mix system

Answer: A plug flow system is identified by its characteristically long narrow tanks, with the heaviest loading near the influent area and tapering off as it travels through the system. These systems are less prone to filamentous bulking as long as sufficient dissolved oxygen is present near the influent. So the answer is C, plug flow system.

Source: WEF MOP11 20-14

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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