CA GRADE 2 WASTEWATER TREATMENT
OPERATOR PRACTICE EXAM 1
1. What is the methane content in a properly operating anaerobic digester?
Answer 65 to 70% by volume
2. What will the addition of chlorine gas do to the pH of wastewater?
Answer decrease the pH
3. What is the purpose of a Parshall Flume?
Answer Measure the flow rate
4. What is the typical removal efficency of settleable solids in a primary clarifi- er?
Answer 95 to 99%
5. Which of the follwing is true about pumoing scum from a primary clarifier?
Answer -
scum causes more piping problems than other substances pumped at a wastewater treatment plant
6. What might cause thick billows of white sudsy foam in the aeration tank?
Answer MLSS is too low
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, 7. What does the M in F/M ratio represent?
Answer The mixed liquor volatile suspended solids in the aeration tank
8. In general, how will warmer temp affect the settling rate of solids in a clar- ifer?
Answer Increase the settling rate
9. What could happen if the digester gas is mixed with air(85 to 95% by volume)?-
Answer Cause an explosion
10. How will algae impact the chlorine demand in the pond effluent?
Answer increase the chlorine demand
11. Which of the following is true about a positive displacement pump?
Answer it must never be started with the discharge valve closed
12. What is true about the F/M ratio?
Answer the volume of the secondary clarifier is not needed to determine the f/m ratio
13. 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
14. What is the recirculation ratio for a trickling filter?
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OPERATOR PRACTICE EXAM 1
1. What is the methane content in a properly operating anaerobic digester?
Answer 65 to 70% by volume
2. What will the addition of chlorine gas do to the pH of wastewater?
Answer decrease the pH
3. What is the purpose of a Parshall Flume?
Answer Measure the flow rate
4. What is the typical removal efficency of settleable solids in a primary clarifi- er?
Answer 95 to 99%
5. Which of the follwing is true about pumoing scum from a primary clarifier?
Answer -
scum causes more piping problems than other substances pumped at a wastewater treatment plant
6. What might cause thick billows of white sudsy foam in the aeration tank?
Answer MLSS is too low
1/
14
, 7. What does the M in F/M ratio represent?
Answer The mixed liquor volatile suspended solids in the aeration tank
8. In general, how will warmer temp affect the settling rate of solids in a clar- ifer?
Answer Increase the settling rate
9. What could happen if the digester gas is mixed with air(85 to 95% by volume)?-
Answer Cause an explosion
10. How will algae impact the chlorine demand in the pond effluent?
Answer increase the chlorine demand
11. Which of the following is true about a positive displacement pump?
Answer it must never be started with the discharge valve closed
12. What is true about the F/M ratio?
Answer the volume of the secondary clarifier is not needed to determine the f/m ratio
13. 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
14. What is the recirculation ratio for a trickling filter?
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14
