Wastewater Treatment Operator Certification Test #3 Questions with Verified Answers|
Latest Update Graded A+
What should be done if you see sludge rising in the primary clarifier?
A) Reduce frequency of sludge pumping
B) Adjust the MCRT
C) Remove sludge more frequently
D) Fix uneven weir setting C) Remove sludge more frequently (v.1 pg 130)
Which of the following is true about trickling filters?
A) Its mostly an anaerobic process
B) Its mostly an anoxic process
C) Photosynthesis is an important part of the trickling filter
D) Its mostly an aerobic process D) Its mostly an aerobic process (v.1 pg 175)
How does temperature affect the activity of microorganisms in a an aeration tank?
A) Low microorganism growth rate as temperature increases
B) Rapid microorganism growth rate as the temperature increases
C) Does not affect activity of microorganisms
D) Decrease in temperature will result in more biological activity B) Rapid microorganism
growth rate as the temperature increases (v.2 pg 71)
What change would most likely be made to an activated sludge process during the winter?
A) Decrease solids under aeration
B) Increase pH
,C) Increase solids under aeration
D) Add chlorine to the influent of the aeration tank C) Increase solids under aeration (v.2 pg
71)
If the influent solids loading rate to an activated sludge system increases, what should be done?
A) Increase sludge waste rate
B) Decrease MLSS
C) Decrease temperature of aeration tank
D) Reduce wasting rate of the sludge D) Reduce wasting rate of the sludge (v.2 pg 53)
What could happen if a valve is closed to quickly?
A) Water hammer
B) Cavitation
C) Tuberculation
D) Gasification A) Water hammer
Which part of a facultative pond would you most likely find abundant algae growth?
A) Middle layer
B) Lower layer
C) Upper layer
D) Algae grows evenly in every layer C) Upper layer (v.1 pg 299)
What is the main purpose of primary treatment?
, A) Convert dissolved or suspended solids into a form more readily separated from wastewater.
B) To remove substances that readily settle or float
C) To remove debris and trash, such as wood, roots and rags.
D) To remove heavy inorganic material such as sand, eggshells, gravel, and cinders B) To
remove substances that readily settle or float (v.1 pg 43)
What may be the problem if solids in the secondary clarifier are settling very slowly?
A) Denitrification
B) Nitrification
C) Sludge bulking
D) Excessive sludge pumping C) Sludge bulking (v.2 pg 71)
What will happen if the influent BOD increases in an activated sludge system?
A) Less oxygen will be required in the aeration tank
B) Hydrogen sulfide production will increase during normal operation
C) Temperature in the secondary clarifier will decrease
D) More oxygen will be required in the aeration tank D) More oxygen will be required in the
aeration tank (v.2 pg 19)
Which of the following is the most likely cause of oxygen depletion in the receiving waters,
downstream of a wastewater treatment plant?
A) Dissolved solids
B) Bacteria decomposing dead algae
C) Manganese
D) Carbon dioxide B) Bacteria decomposing dead algae (v.1 pg 23)
Latest Update Graded A+
What should be done if you see sludge rising in the primary clarifier?
A) Reduce frequency of sludge pumping
B) Adjust the MCRT
C) Remove sludge more frequently
D) Fix uneven weir setting C) Remove sludge more frequently (v.1 pg 130)
Which of the following is true about trickling filters?
A) Its mostly an anaerobic process
B) Its mostly an anoxic process
C) Photosynthesis is an important part of the trickling filter
D) Its mostly an aerobic process D) Its mostly an aerobic process (v.1 pg 175)
How does temperature affect the activity of microorganisms in a an aeration tank?
A) Low microorganism growth rate as temperature increases
B) Rapid microorganism growth rate as the temperature increases
C) Does not affect activity of microorganisms
D) Decrease in temperature will result in more biological activity B) Rapid microorganism
growth rate as the temperature increases (v.2 pg 71)
What change would most likely be made to an activated sludge process during the winter?
A) Decrease solids under aeration
B) Increase pH
,C) Increase solids under aeration
D) Add chlorine to the influent of the aeration tank C) Increase solids under aeration (v.2 pg
71)
If the influent solids loading rate to an activated sludge system increases, what should be done?
A) Increase sludge waste rate
B) Decrease MLSS
C) Decrease temperature of aeration tank
D) Reduce wasting rate of the sludge D) Reduce wasting rate of the sludge (v.2 pg 53)
What could happen if a valve is closed to quickly?
A) Water hammer
B) Cavitation
C) Tuberculation
D) Gasification A) Water hammer
Which part of a facultative pond would you most likely find abundant algae growth?
A) Middle layer
B) Lower layer
C) Upper layer
D) Algae grows evenly in every layer C) Upper layer (v.1 pg 299)
What is the main purpose of primary treatment?
, A) Convert dissolved or suspended solids into a form more readily separated from wastewater.
B) To remove substances that readily settle or float
C) To remove debris and trash, such as wood, roots and rags.
D) To remove heavy inorganic material such as sand, eggshells, gravel, and cinders B) To
remove substances that readily settle or float (v.1 pg 43)
What may be the problem if solids in the secondary clarifier are settling very slowly?
A) Denitrification
B) Nitrification
C) Sludge bulking
D) Excessive sludge pumping C) Sludge bulking (v.2 pg 71)
What will happen if the influent BOD increases in an activated sludge system?
A) Less oxygen will be required in the aeration tank
B) Hydrogen sulfide production will increase during normal operation
C) Temperature in the secondary clarifier will decrease
D) More oxygen will be required in the aeration tank D) More oxygen will be required in the
aeration tank (v.2 pg 19)
Which of the following is the most likely cause of oxygen depletion in the receiving waters,
downstream of a wastewater treatment plant?
A) Dissolved solids
B) Bacteria decomposing dead algae
C) Manganese
D) Carbon dioxide B) Bacteria decomposing dead algae (v.1 pg 23)
