CA Wastewater Grade 3 sample questions
Study online at https://quizlet.com/_hrxka8
1. Fluffy white foam indicates low aerator solids concentration, while leathery
brown foam indicates high solids concentration.: T
2. When an anaerobic digester is becoming upset, the first sign will be increased
alkalinity and decreased volatile acid concentration: F
3. Surface aerator oxygen transfer efficiency increases as submergence de-
creases and the oxygen transfer efficiency increases: F
4. When chlorine is used before disinfection for odor control it is not necessary
to satisfy a chlorine demand.: F
5. Biological secondary treatment processes should remove at least 85% of the
influent BOD: T
6. Short detention times are normal for package plants: F
7. An activated sludge plant with an MCRT of over 10-days is normally
considered an extended aeration plant.: T
8. Wasting of activated sludge on a continuos basis is the preferred
method.: T
9. SVI is used as an indicator for clarifier stability.: T
10. The standard BOD test measures the amount of dissolved oxygen
consumed by bacteria as they utilize waste for food during a 8 day period
at 15 degrees Celsius.: F
11. When operating an aerobic digester be sure to keep the feed sludge
volatile solid concentration high or else the percent reduction will decrease: F
12. Any sample can be "fixed" for later testing.: F
13. The nice thing about anaerobic process is the operator can smoke
since no oxygen is present for a fire to start.: F
14. Dissolved oxygen in an aeration tank should be at a minimum of 1 ppm
for biological nitrification: T
15. Nitrification is the process where by ammonia is converted to nitrogen
gas.: F
16. In order for nitrification to occur you must have an anaerobic process: F
17. Chlorine is lighter than air and will collect on the ceiling if a leak occurs.: F
18. A complete-mix activated sludge basin is normally square allowing
complete MLSS mixing.: T
, CA Wastewater Grade 3 sample questions
Study online at https://quizlet.com/_hrxka8
19. Blanks are used in the BOD test to calculate dilution water DO uptake: T
20. Flexible piping sometimes called a pigtail should connect a chlorine
container to stationary piping.: T
21. Carbon dioxide will lower the pH of water.: T
22. When chlorine gas combines with moisture in the air it forms
hydrochloric gas.: T
23. A high hydrogen sulfide gas concentration is required before your
sense of smell will be dulled.: F
24. Alkalinity is the key control for an activated sludge basin.: F
25. 30 days is normally required for anaerobic digestion: T
26. The first sign that an anaerobic digester is becoming sick is normally
A. a pH change.
B. a decrease in gas production.
C. a change in the volatile acid/alkalinity relationship.
D. an increase in the amount of hydrogen sulfide gas.
E. a temperature change.: C
27. In order for a pond to be functioning correctly________ must be taking
place.
A. photosynthesis
B. rapid temperature changes
C. rapid pH changes
D. rapid DO changes
E. alkalinity changes: A
28. Potential problems of ammonia in wastewater.
A. ammonia toxicity to fish.
B. DO depletion in the receiving waters.
C. Increase algae growth.
D. Blue baby.
E. All the above: E
29. One way to control filamentous organisms is to
A. apply a small dose of chlorine to the RAS.
B. Filamentous organisms do not need to be controlled, they are not patho-
Study online at https://quizlet.com/_hrxka8
1. Fluffy white foam indicates low aerator solids concentration, while leathery
brown foam indicates high solids concentration.: T
2. When an anaerobic digester is becoming upset, the first sign will be increased
alkalinity and decreased volatile acid concentration: F
3. Surface aerator oxygen transfer efficiency increases as submergence de-
creases and the oxygen transfer efficiency increases: F
4. When chlorine is used before disinfection for odor control it is not necessary
to satisfy a chlorine demand.: F
5. Biological secondary treatment processes should remove at least 85% of the
influent BOD: T
6. Short detention times are normal for package plants: F
7. An activated sludge plant with an MCRT of over 10-days is normally
considered an extended aeration plant.: T
8. Wasting of activated sludge on a continuos basis is the preferred
method.: T
9. SVI is used as an indicator for clarifier stability.: T
10. The standard BOD test measures the amount of dissolved oxygen
consumed by bacteria as they utilize waste for food during a 8 day period
at 15 degrees Celsius.: F
11. When operating an aerobic digester be sure to keep the feed sludge
volatile solid concentration high or else the percent reduction will decrease: F
12. Any sample can be "fixed" for later testing.: F
13. The nice thing about anaerobic process is the operator can smoke
since no oxygen is present for a fire to start.: F
14. Dissolved oxygen in an aeration tank should be at a minimum of 1 ppm
for biological nitrification: T
15. Nitrification is the process where by ammonia is converted to nitrogen
gas.: F
16. In order for nitrification to occur you must have an anaerobic process: F
17. Chlorine is lighter than air and will collect on the ceiling if a leak occurs.: F
18. A complete-mix activated sludge basin is normally square allowing
complete MLSS mixing.: T
, CA Wastewater Grade 3 sample questions
Study online at https://quizlet.com/_hrxka8
19. Blanks are used in the BOD test to calculate dilution water DO uptake: T
20. Flexible piping sometimes called a pigtail should connect a chlorine
container to stationary piping.: T
21. Carbon dioxide will lower the pH of water.: T
22. When chlorine gas combines with moisture in the air it forms
hydrochloric gas.: T
23. A high hydrogen sulfide gas concentration is required before your
sense of smell will be dulled.: F
24. Alkalinity is the key control for an activated sludge basin.: F
25. 30 days is normally required for anaerobic digestion: T
26. The first sign that an anaerobic digester is becoming sick is normally
A. a pH change.
B. a decrease in gas production.
C. a change in the volatile acid/alkalinity relationship.
D. an increase in the amount of hydrogen sulfide gas.
E. a temperature change.: C
27. In order for a pond to be functioning correctly________ must be taking
place.
A. photosynthesis
B. rapid temperature changes
C. rapid pH changes
D. rapid DO changes
E. alkalinity changes: A
28. Potential problems of ammonia in wastewater.
A. ammonia toxicity to fish.
B. DO depletion in the receiving waters.
C. Increase algae growth.
D. Blue baby.
E. All the above: E
29. One way to control filamentous organisms is to
A. apply a small dose of chlorine to the RAS.
B. Filamentous organisms do not need to be controlled, they are not patho-
