2024 WASTE WATER OPERATOR LV
1 EXAM PREP WITH CORRECT
ANSWERS
What is the purpose of a rectangular sedimentation basin scum trough?
A. Collects the settled wastewater flowing over the weirs
B. Drags sludge to the deep end of the sump for removal by pumping
C. Ensures equal flow over all weirs
D. Receives the floating material from the scum skimmer for removal -
CORRECT-ANSWERSD. Receives the floating material from the scum skimmer
for removal
Why must fats, oils, hair, and other light material be removed by flotation?
A. To allow for the recover and recycling of this valuable resource
B. To prevent the material from settling to the bottom of the tank
C. To protect the aesthetics of receiving wasters
D. To remove the material as quick as possible to avoid odor complaints -
CORRECT-ANSWERSC. To protect the aesthetics of receiving wasters
For a combined sedimentation-digestion unit what is the purpose of inflow
measurement?
A. To determine if effective digestion is taking place
B. To determine if sufficient chlorine is being applied to the effluent
C. To determine the efficiency of clarifier removal
D. To determine the hydraulic loading on the facility - CORRECT-ANSWERSD.
To determine the hydraulic loading on the facility
What is the name for the biological slime growth that develops on the
trickling filter media?
A. Biosolids
B. Schmutzdecke
C. Volatile acid film
D. Zoogleal film - CORRECT-ANSWERSD. Zoogleal film
When evaluating trickling filter operating records operators should adjust the
process according to which main principle?
, A. To minimize all operational costs
B. To obtain the best possible results for the least cost
C. To use the least amount of chlorine
D. To use the lowest recitculation rates - CORRECT-ANSWERSB. To obtain the
best possible results for the least cost
In the activated sludge process, some of the activated sludge must be
wasted to...
A. Prevent excessive solid buildup
B. Prevent clogging of the sludge return line
C. Prevent overloading of sludge return pumps
D. Increase digester gas production - CORRECT-ANSWERSA. Prevent
excessive solid buildup
The best operating strategy for feeding primary sludge to an anaerobic
digester is to feed...
A. Several time a day
B. Large quantities once or twice a day
C. Once a day
D. When the volatile solids drop below 60% - CORRECT-ANSWERSA. Several
time a day
Why is scum skimmed from the liquid surface of a primary settling tank?
A. To reduce load on the digester
B. To eliminate interference with sludge removal
C. To allow aeration of the tank contents
D. To reduce odor and insect nuisance - CORRECT-ANSWERSB. To eliminate
interference with sludge removal
Which of the following test would give the fastest indication of toxicity in an
activated sludge process?
A. Oxygen Uptake Rate (OUR)
B. Settleometer
C. MLSS
D. Microscopic Observation - CORRECT-ANSWERSA. Oxygen Uptake Rate
(OUR)
Filamentous bulking of activated sludge may be controlled temporarily by...
1 EXAM PREP WITH CORRECT
ANSWERS
What is the purpose of a rectangular sedimentation basin scum trough?
A. Collects the settled wastewater flowing over the weirs
B. Drags sludge to the deep end of the sump for removal by pumping
C. Ensures equal flow over all weirs
D. Receives the floating material from the scum skimmer for removal -
CORRECT-ANSWERSD. Receives the floating material from the scum skimmer
for removal
Why must fats, oils, hair, and other light material be removed by flotation?
A. To allow for the recover and recycling of this valuable resource
B. To prevent the material from settling to the bottom of the tank
C. To protect the aesthetics of receiving wasters
D. To remove the material as quick as possible to avoid odor complaints -
CORRECT-ANSWERSC. To protect the aesthetics of receiving wasters
For a combined sedimentation-digestion unit what is the purpose of inflow
measurement?
A. To determine if effective digestion is taking place
B. To determine if sufficient chlorine is being applied to the effluent
C. To determine the efficiency of clarifier removal
D. To determine the hydraulic loading on the facility - CORRECT-ANSWERSD.
To determine the hydraulic loading on the facility
What is the name for the biological slime growth that develops on the
trickling filter media?
A. Biosolids
B. Schmutzdecke
C. Volatile acid film
D. Zoogleal film - CORRECT-ANSWERSD. Zoogleal film
When evaluating trickling filter operating records operators should adjust the
process according to which main principle?
, A. To minimize all operational costs
B. To obtain the best possible results for the least cost
C. To use the least amount of chlorine
D. To use the lowest recitculation rates - CORRECT-ANSWERSB. To obtain the
best possible results for the least cost
In the activated sludge process, some of the activated sludge must be
wasted to...
A. Prevent excessive solid buildup
B. Prevent clogging of the sludge return line
C. Prevent overloading of sludge return pumps
D. Increase digester gas production - CORRECT-ANSWERSA. Prevent
excessive solid buildup
The best operating strategy for feeding primary sludge to an anaerobic
digester is to feed...
A. Several time a day
B. Large quantities once or twice a day
C. Once a day
D. When the volatile solids drop below 60% - CORRECT-ANSWERSA. Several
time a day
Why is scum skimmed from the liquid surface of a primary settling tank?
A. To reduce load on the digester
B. To eliminate interference with sludge removal
C. To allow aeration of the tank contents
D. To reduce odor and insect nuisance - CORRECT-ANSWERSB. To eliminate
interference with sludge removal
Which of the following test would give the fastest indication of toxicity in an
activated sludge process?
A. Oxygen Uptake Rate (OUR)
B. Settleometer
C. MLSS
D. Microscopic Observation - CORRECT-ANSWERSA. Oxygen Uptake Rate
(OUR)
Filamentous bulking of activated sludge may be controlled temporarily by...
