ABC Wastewater Level 3 - Activated Sludge
Study online at https://quizlet.com/_hdi7oj
1. Performance problems in the activated sludge process D. Insufficient operator
can be caused by ____________. training
A. Poor solids dewatering
B. Inadequate chlorination of effluent
C. Consistent influent characteristics
D. Insufficient operator training
2. Solids that float to the surface of the clarifier are re- D. Scum
ferred to as ____________.
A. Mixed liquor
B. Film
C. Residual solids
D. Scum
3. Solids that settle to the bottom of clarifiers and are re- B. WAS
moved from the process are referred to as ___________.
A. RAS
B. WAS
C. TSS
D. Total residual chlorine
4. Large amounts of filamentous bacteria can improve B. False
floc structure and speed the settling of the mixed
liquor.
A. True
B. False
5. Protozoans are much more abundant than bacteria in B. False
activated sludge.
A. True
B. False
6. B. False
, ABC Wastewater Level 3 - Activated Sludge
Study online at https://quizlet.com/_hdi7oj
Under normal conditions, fungi (yeast and molds) are
present in activated sludge processes.
A. True
B. False
7. Algae are microscopic plants that can become a nui- A. True
sance in clarifier launders.
A. True
B. False
8. Which of the following does not result from a pH im- A. Power consumption
balance in an activated sludge process?
A. Power consumption
B. Inability to maintain a healthy biomass
C. Damage to process equipment
D. Increased cost because of chemical addition
9. Because of industrial flows and the nitrification B. Alkalinity
process, pH imbalances may become a concern for
activated sludge processes if sufficient __________ is not
present.
A. TSS
B. Alkalinity
C. Ammonia
D. BOD
10. Which of the following is NOT a phase of a typical A. Filter
sequencing batch reactor treatment cycle?
A. Filter
B. Fill
C. Decant
D. Settle
, ABC Wastewater Level 3 - Activated Sludge
Study online at https://quizlet.com/_hdi7oj
11. Because multiple steps occur in a single reactor, the se- B. False
quencing batch reactor process provides little control
over effluent quality.
A. True
B. False
12. Which of the following terms is used to describe bio- C. Multiple process trains
logical reactors arranged in a parallel configuration?
A. Parallel processors
B. Parallel-lined systems
C. Multiple process trains
D. Reactor chains
13. Using portable DO meters can be more economi- A. True
cal than using permanently installed, continuous-read
units.
A. True
B. False
14. What equipment can be used with surface aerators to A. Draft tubes
aid mixing in deep reactors?
A. Draft tubes
B. Rotor extensions
C. Turbo injectors
D. Extended impellers
15. What type of problem can the splashing of surface D. Biohazards
aerators cause in or around a reactor?
A. Poor oxygen transfer
B. Inadequate mixing
C. Excessive heat gain
D. Biohazards
Study online at https://quizlet.com/_hdi7oj
1. Performance problems in the activated sludge process D. Insufficient operator
can be caused by ____________. training
A. Poor solids dewatering
B. Inadequate chlorination of effluent
C. Consistent influent characteristics
D. Insufficient operator training
2. Solids that float to the surface of the clarifier are re- D. Scum
ferred to as ____________.
A. Mixed liquor
B. Film
C. Residual solids
D. Scum
3. Solids that settle to the bottom of clarifiers and are re- B. WAS
moved from the process are referred to as ___________.
A. RAS
B. WAS
C. TSS
D. Total residual chlorine
4. Large amounts of filamentous bacteria can improve B. False
floc structure and speed the settling of the mixed
liquor.
A. True
B. False
5. Protozoans are much more abundant than bacteria in B. False
activated sludge.
A. True
B. False
6. B. False
, ABC Wastewater Level 3 - Activated Sludge
Study online at https://quizlet.com/_hdi7oj
Under normal conditions, fungi (yeast and molds) are
present in activated sludge processes.
A. True
B. False
7. Algae are microscopic plants that can become a nui- A. True
sance in clarifier launders.
A. True
B. False
8. Which of the following does not result from a pH im- A. Power consumption
balance in an activated sludge process?
A. Power consumption
B. Inability to maintain a healthy biomass
C. Damage to process equipment
D. Increased cost because of chemical addition
9. Because of industrial flows and the nitrification B. Alkalinity
process, pH imbalances may become a concern for
activated sludge processes if sufficient __________ is not
present.
A. TSS
B. Alkalinity
C. Ammonia
D. BOD
10. Which of the following is NOT a phase of a typical A. Filter
sequencing batch reactor treatment cycle?
A. Filter
B. Fill
C. Decant
D. Settle
, ABC Wastewater Level 3 - Activated Sludge
Study online at https://quizlet.com/_hdi7oj
11. Because multiple steps occur in a single reactor, the se- B. False
quencing batch reactor process provides little control
over effluent quality.
A. True
B. False
12. Which of the following terms is used to describe bio- C. Multiple process trains
logical reactors arranged in a parallel configuration?
A. Parallel processors
B. Parallel-lined systems
C. Multiple process trains
D. Reactor chains
13. Using portable DO meters can be more economi- A. True
cal than using permanently installed, continuous-read
units.
A. True
B. False
14. What equipment can be used with surface aerators to A. Draft tubes
aid mixing in deep reactors?
A. Draft tubes
B. Rotor extensions
C. Turbo injectors
D. Extended impellers
15. What type of problem can the splashing of surface D. Biohazards
aerators cause in or around a reactor?
A. Poor oxygen transfer
B. Inadequate mixing
C. Excessive heat gain
D. Biohazards
