Maintaining your education is important, especially in a career that demands licensing exams. Prove you’re an expert operator by answering this question and others from our Exam Study Guide Series. Take a look at this question on fixed film processes along with an explanation of the correct answer.

Sample question:

What is the name for the jelly like biomass made up of a large and diverse population of living organisms (such as bacteria, protozoa, fungi, algae and worms) that adheres to the media of trickling filters?

Related: Study Guide: General Knowledge


A) Fecal coliforms
B) Endogenous residue
C) Zoogleal matter
D) Thermophilic jelly

The answer is C, zoogleal matter, which is a viscous slime that adheres to the media. Most of the population in this mass is aerobic organisms requiring oxygen to function properly.

Related: Exam Study Guide: Chlorine Cylinder Emergency Leak Repair

Source: WEF MOP11 21-4

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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