1|Page
California Wastewater Treatment Operator Grade II ||
Verified Questions with Correct Answers and
explanations LATEST UPDATE.pdf
What might cause thick billows of white sudsy foam in the
aeration tank? - Answer-MLSS is too low
What does the M in F/M ratio represent? - Answer-The
mixed liquor volatile suspended solids in the aeration tank
In general, how will warmer temp affect the settling rate of
solids in a clarifer? - Answer-Increase the settling rate
What could happen if the digester gas is mixed with air(85
to 95% by volume)? - Answer-Cause an explosion
How will algae impact the chlorine demand in the pond
effluent? - Answer-increase the chlorine demand
Which of the following is true about a positive
displacement pump? - Answer-it must never be started
with the discharge valve closed
,2|Page
What is true about the F/M ratio? - Answer-the volume of
the secondary clarifier is not needed to determine the f/m
ratio
Which of the following is one of the basic rules of lab
work? - Answer-never pipet hazardous material with your
mouth, even if the pipet has been sterialized
What is the recirculation ratio for a trickling filter? -
Answer-Qr/Q
Which of the following is true about COD and BOD? -
Answer-they are indirect measurements of the organic
content in the influent
What is the purpose of the grit channel? - Answer-remove
heavy inorganic waste
What is the methane content in a properly operating
anaerobic digester? - Answer-65 to 70% by volume
What will the addition of chlorine gas do to the pH of
wastewater? - Answer-decrease the pH
,3|Page
What is the purpose of a Parshall Flume? - Answer-
Measure the flow rate
What is the typical removal efficiency of settleable solids in
a primary clarifier? - Answer-95 to 99%
Which of the following is true about pumoing scum from a
primary clarifier? - Answer-scum causes more piping
problems than other substances pumped at a wastewater
treatment plant
Which of the following is true about the extended aeration
process? - Answer-it does not produce as much waste
sludge as other processes
What is the correct formula for solids in raw wastewater? -
Answer-Non settleable solids + settleable solids = total
suspended solids
What is freeboard in a waste stabilization pond? - Answer-
the vertical distance from normal water surface to the top
of the levee
, 4|Page
What is one of the requirements for a BOD test? - Answer-
The BOD bottle should be completely filled to the top
What should be scheduled every 3 months for a flamer
arrester in an anaerobic digester? - Answer-maintenance
What is common practice in an activated sludge process?
- Answer-recirculate activated sludge
Prior to entering a permit-required confined space, what
should you verify? - Answer-a standby person should be
located outside the entrance to the confined space, while
another person should be within sight or call of the
standby person
What is a common way to determine the organic strength
of wastes in the influent? - Answer-test for the biochemical
oxygen demand
What should you do if you are mildly exposed to chlorine
gas? - Answer-immediately evacuate the contaminated
California Wastewater Treatment Operator Grade II ||
Verified Questions with Correct Answers and
explanations LATEST UPDATE.pdf
What might cause thick billows of white sudsy foam in the
aeration tank? - Answer-MLSS is too low
What does the M in F/M ratio represent? - Answer-The
mixed liquor volatile suspended solids in the aeration tank
In general, how will warmer temp affect the settling rate of
solids in a clarifer? - Answer-Increase the settling rate
What could happen if the digester gas is mixed with air(85
to 95% by volume)? - Answer-Cause an explosion
How will algae impact the chlorine demand in the pond
effluent? - Answer-increase the chlorine demand
Which of the following is true about a positive
displacement pump? - Answer-it must never be started
with the discharge valve closed
,2|Page
What is true about the F/M ratio? - Answer-the volume of
the secondary clarifier is not needed to determine the f/m
ratio
Which of the following is one of the basic rules of lab
work? - Answer-never pipet hazardous material with your
mouth, even if the pipet has been sterialized
What is the recirculation ratio for a trickling filter? -
Answer-Qr/Q
Which of the following is true about COD and BOD? -
Answer-they are indirect measurements of the organic
content in the influent
What is the purpose of the grit channel? - Answer-remove
heavy inorganic waste
What is the methane content in a properly operating
anaerobic digester? - Answer-65 to 70% by volume
What will the addition of chlorine gas do to the pH of
wastewater? - Answer-decrease the pH
,3|Page
What is the purpose of a Parshall Flume? - Answer-
Measure the flow rate
What is the typical removal efficiency of settleable solids in
a primary clarifier? - Answer-95 to 99%
Which of the following is true about pumoing scum from a
primary clarifier? - Answer-scum causes more piping
problems than other substances pumped at a wastewater
treatment plant
Which of the following is true about the extended aeration
process? - Answer-it does not produce as much waste
sludge as other processes
What is the correct formula for solids in raw wastewater? -
Answer-Non settleable solids + settleable solids = total
suspended solids
What is freeboard in a waste stabilization pond? - Answer-
the vertical distance from normal water surface to the top
of the levee
, 4|Page
What is one of the requirements for a BOD test? - Answer-
The BOD bottle should be completely filled to the top
What should be scheduled every 3 months for a flamer
arrester in an anaerobic digester? - Answer-maintenance
What is common practice in an activated sludge process?
- Answer-recirculate activated sludge
Prior to entering a permit-required confined space, what
should you verify? - Answer-a standby person should be
located outside the entrance to the confined space, while
another person should be within sight or call of the
standby person
What is a common way to determine the organic strength
of wastes in the influent? - Answer-test for the biochemical
oxygen demand
What should you do if you are mildly exposed to chlorine
gas? - Answer-immediately evacuate the contaminated
