ABC Wastewater Verified Multiple Choice and Conceptual Actual Frequently Tested
Exam Questions With Reviewed 100% Correct Detailed Answers
Guaranteed Pass!!Current Update!!
Performance problems in the activated sludge process
can be caused by .
A. Poor solids dewatering
D. Insuflcient operator training
B. Inadequate chlorination of effluent
C. Consistent influent characteristics
D. Insuflcient operator training
Solids that float to the surface of the clarifier are referred
to as .
A. Mixed liquor
D. Scum
B. Film
C. Residual solids
D. Scum
Solids that settle to the bottom of clarifiers and are re-
moved from the process are referred to as .
A. RAS
B. WAS
B. WAS
C. TSS
D. Total residual chlorine
Large amounts of filamentous bacteria can improve floc
structure and speed the settling of the mixed liquor.
B. False
A. True
B. False
Protozoans are much more abundant than bacteria in
activated sludge.
B. False
A. True
B. False
Under normal conditions, fungi (yeast and molds) are
present in activated sludge processes.
B. False
A. True
B. False
, ABC Wastewater Verified Multiple Choice and Conceptual Actual Frequently Tested
Exam Questions With Reviewed 100% Correct Detailed Answers
Guaranteed Pass!!Current Update!!
Algae are microscopic plants that can become a nuisance
in clarifier launders.
A. True
A. True
B. False
Which of the following does not result from a pH imbal-
ance in an activated sludge process?
A. Power consumption
A. Power consumption
B. Inability to maintain a healthy biomass
C. Damage to process equipment
D. Increased cost because of chemical addition
Because of industrial flows and the nitrification process,
pH imbalances may become a concern for activated
sludge processes if suflcient is not present.
A. TSS B. Alkalinity
B. Alkalinity
C. Ammonia
D. BOD
Which of the following is NOT a phase of a typical se-
quencing batch reactor treatment cycle?
A. Filter
A. Filter
B. Fill
C. Decant
D. Settle
Because multiple steps occur in a single reactor, the se-
quencing batch reactor process provides little control over
effluent quality. B. False
A. True
B. False
Which of the following terms is used to describe biological
reactors arranged in a parallel configuration?
, ABC Wastewater Verified Multiple Choice and Conceptual Actual Frequently Tested
Exam Questions With Reviewed 100% Correct Detailed Answers
Guaranteed Pass!!Current Update!!
A. Parallel processors
B. Parallel-lined systems
C. Multiple process trains
C. Multiple process trains
D. Reactor chains
Using portable DO meters can be more economical than
using permanently installed, continuous-read units.
A. True
A. True
B. False
What equipment can be used with surface aerators to aid
mixing in deep reactors?
A. Draft tubes
A. Draft tubes
B. Rotor extensions
C. Turbo injectors
D. Extended impellers
What type of problem can the splashing of surface aera-
tors cause in or around a reactor?
A. Poor oxygen transfer
D. Biohazards
B. Inadequate mixing
C. Excessive heat gain
D. Biohazards
Accelerated respiration rates in high-purity oxygen sys-
tems require increased detention times for suflcient
treatment of wastewater. B. False
A. True
B. False
Which of the following is NOT used to generate high-pu-
rity oxygen for activated sludge processes?
B. Electrolysis of water
A. Liquid oxygen
B. Electrolysis of water
Exam Questions With Reviewed 100% Correct Detailed Answers
Guaranteed Pass!!Current Update!!
Performance problems in the activated sludge process
can be caused by .
A. Poor solids dewatering
D. Insuflcient operator training
B. Inadequate chlorination of effluent
C. Consistent influent characteristics
D. Insuflcient operator training
Solids that float to the surface of the clarifier are referred
to as .
A. Mixed liquor
D. Scum
B. Film
C. Residual solids
D. Scum
Solids that settle to the bottom of clarifiers and are re-
moved from the process are referred to as .
A. RAS
B. WAS
B. WAS
C. TSS
D. Total residual chlorine
Large amounts of filamentous bacteria can improve floc
structure and speed the settling of the mixed liquor.
B. False
A. True
B. False
Protozoans are much more abundant than bacteria in
activated sludge.
B. False
A. True
B. False
Under normal conditions, fungi (yeast and molds) are
present in activated sludge processes.
B. False
A. True
B. False
, ABC Wastewater Verified Multiple Choice and Conceptual Actual Frequently Tested
Exam Questions With Reviewed 100% Correct Detailed Answers
Guaranteed Pass!!Current Update!!
Algae are microscopic plants that can become a nuisance
in clarifier launders.
A. True
A. True
B. False
Which of the following does not result from a pH imbal-
ance in an activated sludge process?
A. Power consumption
A. Power consumption
B. Inability to maintain a healthy biomass
C. Damage to process equipment
D. Increased cost because of chemical addition
Because of industrial flows and the nitrification process,
pH imbalances may become a concern for activated
sludge processes if suflcient is not present.
A. TSS B. Alkalinity
B. Alkalinity
C. Ammonia
D. BOD
Which of the following is NOT a phase of a typical se-
quencing batch reactor treatment cycle?
A. Filter
A. Filter
B. Fill
C. Decant
D. Settle
Because multiple steps occur in a single reactor, the se-
quencing batch reactor process provides little control over
effluent quality. B. False
A. True
B. False
Which of the following terms is used to describe biological
reactors arranged in a parallel configuration?
, ABC Wastewater Verified Multiple Choice and Conceptual Actual Frequently Tested
Exam Questions With Reviewed 100% Correct Detailed Answers
Guaranteed Pass!!Current Update!!
A. Parallel processors
B. Parallel-lined systems
C. Multiple process trains
C. Multiple process trains
D. Reactor chains
Using portable DO meters can be more economical than
using permanently installed, continuous-read units.
A. True
A. True
B. False
What equipment can be used with surface aerators to aid
mixing in deep reactors?
A. Draft tubes
A. Draft tubes
B. Rotor extensions
C. Turbo injectors
D. Extended impellers
What type of problem can the splashing of surface aera-
tors cause in or around a reactor?
A. Poor oxygen transfer
D. Biohazards
B. Inadequate mixing
C. Excessive heat gain
D. Biohazards
Accelerated respiration rates in high-purity oxygen sys-
tems require increased detention times for suflcient
treatment of wastewater. B. False
A. True
B. False
Which of the following is NOT used to generate high-pu-
rity oxygen for activated sludge processes?
B. Electrolysis of water
A. Liquid oxygen
B. Electrolysis of water
