1|Page
Alberta Wastewater Treatment Operator Level 1 Exam
Actual Verified Exam Questions with Correct Answers
and explanations LATEST THIS YEAR -JUST
RELEASED.pdf||NEWEST EXAM!!!
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 - Answer-A. Oxygen Uptake
Rate (OUR)
Filamentous bulking of activated sludge may be controlled
temporarily by...
A. Adding sodium chloride to the aeration tank
B. Spraying water on the aeration tank surface
C. Carefully chlorinating the return sludge and mixed
liquor
,2|Page
D. Aerating the final settling tank - Answer-C. Carefully
chlorinating the return sludge and mixed liquor
Since reaction rates are lower during the winter, the
operator of an activated sludge plant will usually...
A. Increase dissolved oxygen levels
B. Decrease MCRT
C. Decrease wasting
D. Increase MCRT - Answer-D. Increase MCRT
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 - Answer-A. Prevent
excessive solid buildup
The best operating strategy for feeding primary sludge to
an anaerobic digester is to feed...
,3|Page
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% - Answer-A.
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 - Answer-B. To
eliminate interference with sludge removal
In a healthy activated sludge process which of the
following organisms will most likely be found in the
greatest numbers?
A. Stalked Ciliates
, 4|Page
B. Amoebas
C. Free swimming ciliates
D. Nymphs - Answer-A. Stalked Ciliates
Alkalinity is a measure of the ability of wastewater to...
A. Neutralize base
B. Neutralize acid
C. Dissolve organics
D. Maintain constant temperature - Answer-B. Neutralize
acid
What is one advantage of a COD test over a BOD test?
A. Shorter test time
B. More accurate
C. Safer
D. Less chemicals needed - Answer-A. Shorter test time
Fecal coliform results are reported as MPN per...
Alberta Wastewater Treatment Operator Level 1 Exam
Actual Verified Exam Questions with Correct Answers
and explanations LATEST THIS YEAR -JUST
RELEASED.pdf||NEWEST EXAM!!!
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 - Answer-A. Oxygen Uptake
Rate (OUR)
Filamentous bulking of activated sludge may be controlled
temporarily by...
A. Adding sodium chloride to the aeration tank
B. Spraying water on the aeration tank surface
C. Carefully chlorinating the return sludge and mixed
liquor
,2|Page
D. Aerating the final settling tank - Answer-C. Carefully
chlorinating the return sludge and mixed liquor
Since reaction rates are lower during the winter, the
operator of an activated sludge plant will usually...
A. Increase dissolved oxygen levels
B. Decrease MCRT
C. Decrease wasting
D. Increase MCRT - Answer-D. Increase MCRT
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 - Answer-A. Prevent
excessive solid buildup
The best operating strategy for feeding primary sludge to
an anaerobic digester is to feed...
,3|Page
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% - Answer-A.
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 - Answer-B. To
eliminate interference with sludge removal
In a healthy activated sludge process which of the
following organisms will most likely be found in the
greatest numbers?
A. Stalked Ciliates
, 4|Page
B. Amoebas
C. Free swimming ciliates
D. Nymphs - Answer-A. Stalked Ciliates
Alkalinity is a measure of the ability of wastewater to...
A. Neutralize base
B. Neutralize acid
C. Dissolve organics
D. Maintain constant temperature - Answer-B. Neutralize
acid
What is one advantage of a COD test over a BOD test?
A. Shorter test time
B. More accurate
C. Safer
D. Less chemicals needed - Answer-A. Shorter test time
Fecal coliform results are reported as MPN per...
