Ca Grade 2 Wastewater Treatment Operator Practice Exam 1
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Ca Grade 2 Wastewater Treatment Operator Practice
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Ca Grade 2 Wastewater Treatment Operator Practice
Ca Grade 2 Wastewater Treatment
Operator Practice Exam 1
What is the methane content in a properly operating anaerobic digester? Ans- 65 to 70% by volume
What will the addition of chlorine gas do to the pH of wastewater? Ans- decrease the pH
What is the purpose of a Parshall Flume? Ans- Measur...
ca grade 2 wastewater treatment operator practice exam 1
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Ca Grade 2 Wastewater Treatment Operator Practice
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Ca Grade 2 Wastewater Treatment
Operator Practice Exam 1
What is the methane content in a properly operating anaerobic digester? Ans- 65 to 70% by volume
What will the addition of chlorine gas do to the pH of wastewater? Ans- decrease the pH
What is the purpose of a Parshall Flume? Ans- Measure the flow rate
What is the typical removal efficency of settleable solids in a primary clarifier? Ans- 95 to 99%
Which of the follwing is true about pumoing scum from a primary clarifier? Ans- scum causes more
piping problems than other substances pumped at a wastewater treatment plant
What might cause thick billows of white sudsy foam in the aeration tank? Ans- MLSS is too low
What does the M in F/M ratio represent? Ans- 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? Ans- Increase the settling
rate
What could happen if the digester gas is mixed with air(85 to 95% by volume)? Ans- Cause an explosion
How will algae impact the chlorine demand in the pond effluent? Ans- increase the chlorine demand
Which of the following is true about a positive displacement pump? Ans- it must never be started with
the discharge valve closed
, What is true about the F/M ratio? Ans- 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? Ans- never pipet hazardous material with
your mouth, even if the pipet has been sterialized
What is the recirculation ratio for a trickling filter? Ans- Qr/Q
Which of the following is true about COD and BOD? Ans- they are indirect measurements of the organic
content in the influent
What is the purpose of the grit channel? Ans- remove heavy inorganic waste
Which of the following is true about the extended aeration process? Ans- it does not produce as much
waste sludge as other processes
What is the correct formula for solids in raw wastewater? Ans- Non settleable solids + settleable solids =
total suspended solids
What is freeboard in a waste stabilization pond? Ans- the vertical distance from normal water surface to
the top of the levee
What is one of the requirements for a BOD test? Ans- 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? Ans-
maintenance
What is common practice in an activated sludge process? Ans- recirculate activated sludge
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