Basic Wastewater Operator Practice Exam GA WW Class 3 Latest Exam Review 2026 (With Solutions
Stalked ciliates - (ANSWER)What is the predominant organism in a healthy Activated Sludge Treatment
Plant?
Representative and Sub-samples time spaced over 15 minutes apart - (ANSWER)A composite sample
must be?
300ml - (ANSWER)What is the standard volume for a BOD sample bottle?
Plug valve - (ANSWER)If you have a lime slurry feed line, what is the best valve to use?
Old Sludge - (ANSWER)If you notice a predominance of rotifers in your activated sludge sample while
looking at it under a microscope, what does this indicate?
Settling in the clarifiers - (ANSWER)If your activated sludge plant begins to nitrify, what conditions would
you expect to decrease?
360mg/l - (ANSWER)Calculate the BOD given the information:
Initial DO: 8.3
Final DO: 5.9
Milliliters of sample used: 2
By measuring the pump output - (ANSWER)How do you calibrate a chemical feed pump?
H2SO4 - (ANSWER)What is the chemical formula for sulfuric acid?
extended aeration - (ANSWER)What is the most common type of Activated Sludge package plants?
decrease wasting - (ANSWER)What is the most appropriate method of reducing the F:M Ratio?
, Basic Wastewater Operator Practice Exam GA WW Class 3 Latest Exam Review 2026 (With Solutions
Unequal air distribution caused by a blown diffuser - (ANSWER)An operator notices a portion of the
aeration tank with large bubbles rising up. What is the most likely problem?
The pressure on the suction side of the pump - (ANSWER)What is suction lift?
22.5 mg/l - (ANSWER)The primary effluent to a RBC system is 350 mg/l BOD. The primary unit removes
83%, the secondary unit removes 50%, and the final unit removes 25%. What is the BOD leaving the final
unit of the RBC train?
Decrease the lag time for pump operation by moving the floats closer together - (ANSWER)The influent
to the treatment plant is septic. It is determined that it is coming from a lift station upstream from the
plant. What should the operator do?
To protect chemicals that are sensitive to light - (ANSWER)What is the purpose of amber storage
bottles?
24 days - (ANSWER)Calculate SRT
GIVEN: Mixed liquor suspended solids (MLSS) = 2400mg/l
Aeration basin volume = 35,000 gallons = 0.0350 million gallons (MG)
Waste activated sludge (WAS) concentration = 3500mg/l
Waste activated sludge (WAS) flowrate = 0.001MGD
Horizontal & Horizontal - (ANSWER)How should a 1-ton chlorine cylinder be moved?
0.68 - (ANSWER)Calculate F:M ratio
GIVEN: Influent BOD5 = 290mg/l
Influent Flow = 5.0MGD
Aeration basin MLSS = 2650 mg/l
Aeration basin volume = 0.8MG
Stalked ciliates - (ANSWER)What is the predominant organism in a healthy Activated Sludge Treatment
Plant?
Representative and Sub-samples time spaced over 15 minutes apart - (ANSWER)A composite sample
must be?
300ml - (ANSWER)What is the standard volume for a BOD sample bottle?
Plug valve - (ANSWER)If you have a lime slurry feed line, what is the best valve to use?
Old Sludge - (ANSWER)If you notice a predominance of rotifers in your activated sludge sample while
looking at it under a microscope, what does this indicate?
Settling in the clarifiers - (ANSWER)If your activated sludge plant begins to nitrify, what conditions would
you expect to decrease?
360mg/l - (ANSWER)Calculate the BOD given the information:
Initial DO: 8.3
Final DO: 5.9
Milliliters of sample used: 2
By measuring the pump output - (ANSWER)How do you calibrate a chemical feed pump?
H2SO4 - (ANSWER)What is the chemical formula for sulfuric acid?
extended aeration - (ANSWER)What is the most common type of Activated Sludge package plants?
decrease wasting - (ANSWER)What is the most appropriate method of reducing the F:M Ratio?
, Basic Wastewater Operator Practice Exam GA WW Class 3 Latest Exam Review 2026 (With Solutions
Unequal air distribution caused by a blown diffuser - (ANSWER)An operator notices a portion of the
aeration tank with large bubbles rising up. What is the most likely problem?
The pressure on the suction side of the pump - (ANSWER)What is suction lift?
22.5 mg/l - (ANSWER)The primary effluent to a RBC system is 350 mg/l BOD. The primary unit removes
83%, the secondary unit removes 50%, and the final unit removes 25%. What is the BOD leaving the final
unit of the RBC train?
Decrease the lag time for pump operation by moving the floats closer together - (ANSWER)The influent
to the treatment plant is septic. It is determined that it is coming from a lift station upstream from the
plant. What should the operator do?
To protect chemicals that are sensitive to light - (ANSWER)What is the purpose of amber storage
bottles?
24 days - (ANSWER)Calculate SRT
GIVEN: Mixed liquor suspended solids (MLSS) = 2400mg/l
Aeration basin volume = 35,000 gallons = 0.0350 million gallons (MG)
Waste activated sludge (WAS) concentration = 3500mg/l
Waste activated sludge (WAS) flowrate = 0.001MGD
Horizontal & Horizontal - (ANSWER)How should a 1-ton chlorine cylinder be moved?
0.68 - (ANSWER)Calculate F:M ratio
GIVEN: Influent BOD5 = 290mg/l
Influent Flow = 5.0MGD
Aeration basin MLSS = 2650 mg/l
Aeration basin volume = 0.8MG
