What is the methane content in a c
properly operating anaerobic digester?
a. 30 to 35% by volume
b. 1 to 2% by volume
c. 65 to 70% by volume
d. 15 to 20 % by volume
What will the addition of chlorine gas do d
to the pH of wastewater?
a. Moderately increase the pH
b. pH will not be affected
c. Significantly increase the pH
d. Decrease the pH
What is the purpose of a Parshall flume? b
a. Measure turbidity
b. Measure flowrate
c. Measure settling rate
d. Measure solids content
,What is the typical removal efficiency of a
settleable solids in a primary clarifier?
a. 95 to 99%
b. 40 to 60%
C. 20 to 50%
d. 10 to 15%
Which of the following is true about c
pumping scum from a primary clarifier?
a. Pumping scum is less problematic
during cold weather
b. Scum rarely leads to plugged pipelines
due to its viscous nature
c. Scum causes more piping problems
than other substances pumped at a
wastewater treatment plant.
d. Scum causes the least amount of
piping problems among all the
substances pumped at a wastewater
treatment plant pumped at a wastewater
treatment plant
,What might cause thick billows of white d
sudsy foam in the aeration tank?
a. MLSS is too high
b. Temperature in the aeration tank is too
low
c. Old sludge
d. MLSS is too low
What does the "M" in F/M ratio represent? c
a. MLSS in the aeration tank
b. The influent BOD loading rate into the
aeration tank
c. The mixed liquor volatile suspended
solids in the aeration tank
d. The mass of inorganic solids in the
aeration tank
, In general- how will warmer temperature b
affect the settling rate of solids in a
clarifier?
a. Decrease the settling rate
b. Increase the settling rate
c. Temperature will not affect the settling
rate
d. Worsens the settling rate
What could happen if the digester gas is a
mixed with air (85 TO 95% by volume)?
a. Cause an explosion
b. Improve efficiency of digestion
c. The bacteria will become aerobic and
increase VSR
d. The digester becomes safer to operate
due to less toxic gas in the system.
properly operating anaerobic digester?
a. 30 to 35% by volume
b. 1 to 2% by volume
c. 65 to 70% by volume
d. 15 to 20 % by volume
What will the addition of chlorine gas do d
to the pH of wastewater?
a. Moderately increase the pH
b. pH will not be affected
c. Significantly increase the pH
d. Decrease the pH
What is the purpose of a Parshall flume? b
a. Measure turbidity
b. Measure flowrate
c. Measure settling rate
d. Measure solids content
,What is the typical removal efficiency of a
settleable solids in a primary clarifier?
a. 95 to 99%
b. 40 to 60%
C. 20 to 50%
d. 10 to 15%
Which of the following is true about c
pumping scum from a primary clarifier?
a. Pumping scum is less problematic
during cold weather
b. Scum rarely leads to plugged pipelines
due to its viscous nature
c. Scum causes more piping problems
than other substances pumped at a
wastewater treatment plant.
d. Scum causes the least amount of
piping problems among all the
substances pumped at a wastewater
treatment plant pumped at a wastewater
treatment plant
,What might cause thick billows of white d
sudsy foam in the aeration tank?
a. MLSS is too high
b. Temperature in the aeration tank is too
low
c. Old sludge
d. MLSS is too low
What does the "M" in F/M ratio represent? c
a. MLSS in the aeration tank
b. The influent BOD loading rate into the
aeration tank
c. The mixed liquor volatile suspended
solids in the aeration tank
d. The mass of inorganic solids in the
aeration tank
, In general- how will warmer temperature b
affect the settling rate of solids in a
clarifier?
a. Decrease the settling rate
b. Increase the settling rate
c. Temperature will not affect the settling
rate
d. Worsens the settling rate
What could happen if the digester gas is a
mixed with air (85 TO 95% by volume)?
a. Cause an explosion
b. Improve efficiency of digestion
c. The bacteria will become aerobic and
increase VSR
d. The digester becomes safer to operate
due to less toxic gas in the system.
