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CA GRADE 2 WASTEWATER
TREATMENT OPERATOR PRACTICE
EXAM 1 BRAND NEW ACTUAL EXAM
WITH ANSWERS.
1. What type of treatment is primarily used to thicken sludge
instead of dewater the sludge? - correct answer -DAF
Dissolved Air Flotation
2. Why should sludge at the bottom of a clarifier be removed in a
timely manner? - correct answer -to prevent sludge gasification
which causes the sludge to float
3. What is the purpose of sludge digestion? - correct answer -
reduce the volume of the sludge and stabilize the solids
4. Which of the following is true about truckling filters? - correct
answer -the three main parts of a trickling filter are media,
distribution system, and underdrain
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5. Which of the following could cause foaming in an anaerobic
digester? - correct answer -organic overload
6. Which of the following parameters should be monitored several
times a week in a pond? - correct answer -dissolved oxygen,
temperature, and pH
7. Which is true about the temperature in an anaerobic digester? -
correct answer -Temperature in a digester should not be
changed by more than 1 degree Fahrenheit per day
8. The effectiveness of disinfection is determined by: - correct
answer -the coliform concentration in the effluent
9. An increase in the acid/alkalinity ratio for an anaerobic digester
means: - correct answer -Acid concentration is increasing or
alkalinity is decreasing
CA GRADE 2 WASTEWATER
TREATMENT OPERATOR PRACTICE
EXAM 1 BRAND NEW ACTUAL EXAM
WITH ANSWERS.
1. What type of treatment is primarily used to thicken sludge
instead of dewater the sludge? - correct answer -DAF
Dissolved Air Flotation
2. Why should sludge at the bottom of a clarifier be removed in a
timely manner? - correct answer -to prevent sludge gasification
which causes the sludge to float
3. What is the purpose of sludge digestion? - correct answer -
reduce the volume of the sludge and stabilize the solids
4. Which of the following is true about truckling filters? - correct
answer -the three main parts of a trickling filter are media,
distribution system, and underdrain
, Page | 2
5. Which of the following could cause foaming in an anaerobic
digester? - correct answer -organic overload
6. Which of the following parameters should be monitored several
times a week in a pond? - correct answer -dissolved oxygen,
temperature, and pH
7. Which is true about the temperature in an anaerobic digester? -
correct answer -Temperature in a digester should not be
changed by more than 1 degree Fahrenheit per day
8. The effectiveness of disinfection is determined by: - correct
answer -the coliform concentration in the effluent
9. An increase in the acid/alkalinity ratio for an anaerobic digester
means: - correct answer -Acid concentration is increasing or
alkalinity is decreasing
