ABC Wastewater Level 3 - Activated Sludge
Performance problems in the activated D. Insufficient operator training
sludge process can be caused by
____________.
A. Poor solids dewatering
B. Inadequate chlorination of effluent
C. Consistent influent characteristics
D. Insufficient operator training
Solids that float to the surface of the D. Scum
clarifier are referred to as ____________.
A. Mixed liquor
B. Film
C. Residual solids
D. Scum
Solids that settle to the bottom of B. WAS
clarifiers and are removed from the
process are referred to as ___________.
A. RAS
B. WAS
C. TSS
D. Total residual chlorine
, ABC Wastewater Level 3 - Activated Sludge
Large amounts of filamentous bacteria B. False
can improve floc structure and speed the
settling of the mixed liquor.
A. True
B. False
Protozoans are much more abundant B. False
than bacteria in activated sludge.
A. True
B. False
Under normal conditions, fungi (yeast and B. False
molds) are present in activated sludge
processes.
A. True
B. False
Algae are microscopic plants that can A. True
become a nuisance in clarifier launders.
A. True
B. False
, ABC Wastewater Level 3 - Activated Sludge
Which of the following does not result A. Power consumption
from a pH imbalance 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
Because of industrial flows and the B. Alkalinity
nitrification process, pH imbalances may
become a concern for activated sludge
processes if sufficient __________ is not
present.
A. TSS
B. Alkalinity
C. Ammonia
D. BOD
, ABC Wastewater Level 3 - Activated Sludge
Which of the following is NOT a phase of A. Filter
a typical sequencing batch reactor
treatment cycle?
A. Filter
B. Fill
C. Decant
D. Settle
Because multiple steps occur in a single B. False
reactor, the sequencing batch reactor
process provides little control over
effluent quality.
A. True
B. False
Which of the following terms is used to C. Multiple process trains
describe biological reactors arranged in
a parallel configuration?
A. Parallel processors
B. Parallel-lined systems
C. Multiple process trains
D. Reactor chains
Performance problems in the activated D. Insufficient operator training
sludge process can be caused by
____________.
A. Poor solids dewatering
B. Inadequate chlorination of effluent
C. Consistent influent characteristics
D. Insufficient operator training
Solids that float to the surface of the D. Scum
clarifier are referred to as ____________.
A. Mixed liquor
B. Film
C. Residual solids
D. Scum
Solids that settle to the bottom of B. WAS
clarifiers and are removed from the
process are referred to as ___________.
A. RAS
B. WAS
C. TSS
D. Total residual chlorine
, ABC Wastewater Level 3 - Activated Sludge
Large amounts of filamentous bacteria B. False
can improve floc structure and speed the
settling of the mixed liquor.
A. True
B. False
Protozoans are much more abundant B. False
than bacteria in activated sludge.
A. True
B. False
Under normal conditions, fungi (yeast and B. False
molds) are present in activated sludge
processes.
A. True
B. False
Algae are microscopic plants that can A. True
become a nuisance in clarifier launders.
A. True
B. False
, ABC Wastewater Level 3 - Activated Sludge
Which of the following does not result A. Power consumption
from a pH imbalance 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
Because of industrial flows and the B. Alkalinity
nitrification process, pH imbalances may
become a concern for activated sludge
processes if sufficient __________ is not
present.
A. TSS
B. Alkalinity
C. Ammonia
D. BOD
, ABC Wastewater Level 3 - Activated Sludge
Which of the following is NOT a phase of A. Filter
a typical sequencing batch reactor
treatment cycle?
A. Filter
B. Fill
C. Decant
D. Settle
Because multiple steps occur in a single B. False
reactor, the sequencing batch reactor
process provides little control over
effluent quality.
A. True
B. False
Which of the following terms is used to C. Multiple process trains
describe biological reactors arranged in
a parallel configuration?
A. Parallel processors
B. Parallel-lined systems
C. Multiple process trains
D. Reactor chains
