10/13/25, 6:47 AM Basic Wastewater Operator Practice Exam Class 3 Exam fully solved & updated 2025-2026(latest version verified for accuracy) | 2…
Basic Wastewater Operator Practice Exam Class 3
Exam fully solved & updated 2025-2026(latest
version verified for accuracy) | 2024\2025Latest!!
Save
Terms in this set (125)
What is the predominant Stalked ciliates
organism in a healthy
Activated Sludge
Treatment Plant?
A composite sample must Representative and Sub-samples time spaced over 15
be? minutes apart
What is the standard 300ml
volume for a BOD sample
bottle?
If you have a lime slurry Plug valve
feed line, what is the best
valve to use?
If you notice a Old Sludge
predominance of rotifers
in your activated sludge
sample while looking at it
under a microscope, what
does this indicate?
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, 10/13/25, 6:47 AM Basic Wastewater Operator Practice Exam Class 3 Exam fully solved & updated 2025-2026(latest version verified for accuracy) | 2…
If your activated sludge Settling in the clarifiers
plant begins to nitrify,
what conditions would
you expect to decrease?
Calculate the BOD given 360mg/l
the information:
Initial DO: 8.3
Final DO: 5.9
Milliliters of sample used:
2
How do you calibrate a By measuring the pump output
chemical feed pump?
What is the chemical H2SO4
formula for sulfuric acid?
What is the most common extended aeration
type of Activated Sludge
package plants?
What is the most decrease wasting
appropriate method of
reducing the F:M Ratio?
An operator notices a Unequal air distribution caused by a blown diffuser
portion of the aeration
tank with large bubbles
rising up. What is the most
likely problem?
What is suction lift? The pressure on the suction side of the pump
https://quizlet.com/1091733201/basic-wastewater-operator-practice-exam-class-3-exam-fully-solved-updated-2025-2026latest-version-verified-for-ac… 2/14
Basic Wastewater Operator Practice Exam Class 3
Exam fully solved & updated 2025-2026(latest
version verified for accuracy) | 2024\2025Latest!!
Save
Terms in this set (125)
What is the predominant Stalked ciliates
organism in a healthy
Activated Sludge
Treatment Plant?
A composite sample must Representative and Sub-samples time spaced over 15
be? minutes apart
What is the standard 300ml
volume for a BOD sample
bottle?
If you have a lime slurry Plug valve
feed line, what is the best
valve to use?
If you notice a Old Sludge
predominance of rotifers
in your activated sludge
sample while looking at it
under a microscope, what
does this indicate?
https://quizlet.com/1091733201/basic-wastewater-operator-practice-exam-class-3-exam-fully-solved-updated-2025-2026latest-version-verified-for-ac… 1/14
, 10/13/25, 6:47 AM Basic Wastewater Operator Practice Exam Class 3 Exam fully solved & updated 2025-2026(latest version verified for accuracy) | 2…
If your activated sludge Settling in the clarifiers
plant begins to nitrify,
what conditions would
you expect to decrease?
Calculate the BOD given 360mg/l
the information:
Initial DO: 8.3
Final DO: 5.9
Milliliters of sample used:
2
How do you calibrate a By measuring the pump output
chemical feed pump?
What is the chemical H2SO4
formula for sulfuric acid?
What is the most common extended aeration
type of Activated Sludge
package plants?
What is the most decrease wasting
appropriate method of
reducing the F:M Ratio?
An operator notices a Unequal air distribution caused by a blown diffuser
portion of the aeration
tank with large bubbles
rising up. What is the most
likely problem?
What is suction lift? The pressure on the suction side of the pump
https://quizlet.com/1091733201/basic-wastewater-operator-practice-exam-class-3-exam-fully-solved-updated-2025-2026latest-version-verified-for-ac… 2/14
