Basic Wastewater Operator Practice Exam Class 3
Study online at https://quizlet.com/_belbk1
1. Stalked ciliates What is the predominant organism in a healthy Activated Sludge Treat-
ment Plant?
2. Representative and A composite sample must be?
Sub-samples time
spaced over 15 minutes
apart
3. 300ml What is the standard volume for a BOD sample bottle?
4. Plug valve If you have a lime slurry feed line, what is the best valve to use?
5. Old Sludge If you notice a predominance of rotifers in your activated sludge sample
while looking at it under a microscope, what does this indicate?
6. Settling in the clarifiers If your activated sludge plant begins to nitrify, what conditions would
you expect to decrease?
7. 360mg/l Calculate the BOD given the information:
Initial DO: 8.3
Final DO: 5.9
Milliliters of sample used: 2
8. By measuring the pump How do you calibrate a chemical feed pump?
output
9. H2SO4 What is the chemical formula for sulfuric acid?
10. extended aeration What is the most common type of Activated Sludge package plants?
11. decrease wasting What is the most appropriate method of reducing the F:M Ratio?
12. An operator notices a portion of the aeration tank with large bubbles
rising up. What is the most likely problem?
, Basic Wastewater Operator Practice Exam Class 3
Study online at https://quizlet.com/_belbk1
Unequal air distribution
caused by a blown dif-
fuser
13. The pressure on the What is suction lift?
suction side of the
pump
14. 22.5 mg/l 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?
15. Decrease the lag time The influent to the treatment plant is septic. It is determined that it is
for pump operation by coming from a lift station upstream from the plant. What should the
moving the floats closer operator do?
together
16. To protect chemicals What is the purpose of amber storage bottles?
that are sensitive to
light
17. 24 days 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
18. Horizontal & Horizontal How should a 1-ton chlorine cylinder be moved?
19. 0.68 Calculate F:M ratio
GIVEN: Influent BOD5 = 290mg/l
Influent Flow = 5.0MGD
Study online at https://quizlet.com/_belbk1
1. Stalked ciliates What is the predominant organism in a healthy Activated Sludge Treat-
ment Plant?
2. Representative and A composite sample must be?
Sub-samples time
spaced over 15 minutes
apart
3. 300ml What is the standard volume for a BOD sample bottle?
4. Plug valve If you have a lime slurry feed line, what is the best valve to use?
5. Old Sludge If you notice a predominance of rotifers in your activated sludge sample
while looking at it under a microscope, what does this indicate?
6. Settling in the clarifiers If your activated sludge plant begins to nitrify, what conditions would
you expect to decrease?
7. 360mg/l Calculate the BOD given the information:
Initial DO: 8.3
Final DO: 5.9
Milliliters of sample used: 2
8. By measuring the pump How do you calibrate a chemical feed pump?
output
9. H2SO4 What is the chemical formula for sulfuric acid?
10. extended aeration What is the most common type of Activated Sludge package plants?
11. decrease wasting What is the most appropriate method of reducing the F:M Ratio?
12. An operator notices a portion of the aeration tank with large bubbles
rising up. What is the most likely problem?
, Basic Wastewater Operator Practice Exam Class 3
Study online at https://quizlet.com/_belbk1
Unequal air distribution
caused by a blown dif-
fuser
13. The pressure on the What is suction lift?
suction side of the
pump
14. 22.5 mg/l 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?
15. Decrease the lag time The influent to the treatment plant is septic. It is determined that it is
for pump operation by coming from a lift station upstream from the plant. What should the
moving the floats closer operator do?
together
16. To protect chemicals What is the purpose of amber storage bottles?
that are sensitive to
light
17. 24 days 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
18. Horizontal & Horizontal How should a 1-ton chlorine cylinder be moved?
19. 0.68 Calculate F:M ratio
GIVEN: Influent BOD5 = 290mg/l
Influent Flow = 5.0MGD
