Wastewater Operator certification Study Guide-Grade 2 Exam (2025) Ex
Questions & Answers | Latest Already Graded A+ UPDATE 2025|2026!!
1. General Wastewater Treatment: Water elevation
What is the pressure head caused by?
2. General Wastewater Treatment: purple
What color should the piping be that contains re-
claimed water?
3. General Wastewater Treatment: piezometric surface
What is the term for the height to which a column of
water will rise in a well.
4. General Wastewater Treatment: 15-25ft
In general, what is the maximum practical lift of
pumps
5. General Wastewater Treatment: globe
Which one of the following valves is the best to use in
throttling a flow situation?
a. gate
b. butterfly
c. globe
d. ball
6. General Wastewater Treatment: transducer
Which one of the following devices is used to measure
water depths in storage facilities?
, Wastewater Operator certification Study Guide-Grade 2 Exam (2025) Ex
Questions & Answers | Latest Already Graded A+ UPDATE 2025|2026!!
a. transducer
b. Venturi meter
c. magnetic sensor
d. thermistor
7. Wastewater Treatment Facilities: 2 ft/s
The velocity in sanitary sewers is approximately:
8. Wastewater Treatment Facilities: 300-500ft
The distance between manholes ranges from
9. Wastewater Treatment Facilities: 1.0 ft/s
What should the flow velocity be through a grit chan-
nel
10. Wastewater Treatment Facilities: remove some of the or-
ganic matter
Grit washers are used to______
a. remove some of the organic matter
b. remove large pieces of wood
c. remove rags and eggshells
d. remove the odors
11. Wastewater Treatment Facilities: parshall flume
The most common flow-measure device for waste-
water is a_____
12. Wastewater Treatment Facilities: 1.5-2hr
, Wastewater Operator certification Study Guide-Grade 2 Exam (2025) Ex
Questions & Answers | Latest Already Graded A+ UPDATE 2025|2026!!
The detention time for primary clarifiers usually has a
range of_____hr/s
13. Wastewater Treatment Facilities: activated sludge
The effluent from which process is called mixed liquor
a.secondary clarification
b. primary clarification
c. sludge drying bed or pond
d. activated sludge
14. Wastewater Treatment Facilities: 3-6ft
Aerobic ponds usually range in depth from ___-____ft
15. Wastewater Treatment Facilities: 8-12ft
Anaerobic ponds usually range in depth from___-___ft
16. Wastewater Treatment Facilities: raw wastewater lagoon
Another name for a waste stabilization pond is
17. Wastewater sources & characteristics: 50%
Typically what average percent of total solids in a
domestic wastewater, both dissolved and suspended,
are inorganics
18. Wastewater sources & characteristics: 50%
Typically, what average percent of total solids in do-
, Wastewater Operator certification Study Guide-Grade 2 Exam (2025) Ex
Questions & Answers | Latest Already Graded A+ UPDATE 2025|2026!!
mestic wastewater, both dissolved and suspended,
are inorganics?
19. Wastewater sources & characteristics: 87%
Approx. what % of the dissolved solids in wastewater
are inorganics
20. Wastewater sources & characteristics: 12%
Approximately what % of the dissolved solids in waste-
water are organics
21. Wastewater sources & characteristics: free-swimming ciliates
Which organism wold most probably be associated
with moderate sludge age and effluent water quality
22. Wastewater sources & characteristics: amoebas
Which organism would most probably be associated
with high suspended solids and biochemical oxygen
demand (BOD)
23. Wastewater sources & characteristics: flagellates
High suspended solids and BOD are most probably
associated with which type of organisms?
24. Wastewater sources & characteristics: rotifers
What organism would most likely enhance the pene-
tration of oxygen into the activated sludge
Questions & Answers | Latest Already Graded A+ UPDATE 2025|2026!!
1. General Wastewater Treatment: Water elevation
What is the pressure head caused by?
2. General Wastewater Treatment: purple
What color should the piping be that contains re-
claimed water?
3. General Wastewater Treatment: piezometric surface
What is the term for the height to which a column of
water will rise in a well.
4. General Wastewater Treatment: 15-25ft
In general, what is the maximum practical lift of
pumps
5. General Wastewater Treatment: globe
Which one of the following valves is the best to use in
throttling a flow situation?
a. gate
b. butterfly
c. globe
d. ball
6. General Wastewater Treatment: transducer
Which one of the following devices is used to measure
water depths in storage facilities?
, Wastewater Operator certification Study Guide-Grade 2 Exam (2025) Ex
Questions & Answers | Latest Already Graded A+ UPDATE 2025|2026!!
a. transducer
b. Venturi meter
c. magnetic sensor
d. thermistor
7. Wastewater Treatment Facilities: 2 ft/s
The velocity in sanitary sewers is approximately:
8. Wastewater Treatment Facilities: 300-500ft
The distance between manholes ranges from
9. Wastewater Treatment Facilities: 1.0 ft/s
What should the flow velocity be through a grit chan-
nel
10. Wastewater Treatment Facilities: remove some of the or-
ganic matter
Grit washers are used to______
a. remove some of the organic matter
b. remove large pieces of wood
c. remove rags and eggshells
d. remove the odors
11. Wastewater Treatment Facilities: parshall flume
The most common flow-measure device for waste-
water is a_____
12. Wastewater Treatment Facilities: 1.5-2hr
, Wastewater Operator certification Study Guide-Grade 2 Exam (2025) Ex
Questions & Answers | Latest Already Graded A+ UPDATE 2025|2026!!
The detention time for primary clarifiers usually has a
range of_____hr/s
13. Wastewater Treatment Facilities: activated sludge
The effluent from which process is called mixed liquor
a.secondary clarification
b. primary clarification
c. sludge drying bed or pond
d. activated sludge
14. Wastewater Treatment Facilities: 3-6ft
Aerobic ponds usually range in depth from ___-____ft
15. Wastewater Treatment Facilities: 8-12ft
Anaerobic ponds usually range in depth from___-___ft
16. Wastewater Treatment Facilities: raw wastewater lagoon
Another name for a waste stabilization pond is
17. Wastewater sources & characteristics: 50%
Typically what average percent of total solids in a
domestic wastewater, both dissolved and suspended,
are inorganics
18. Wastewater sources & characteristics: 50%
Typically, what average percent of total solids in do-
, Wastewater Operator certification Study Guide-Grade 2 Exam (2025) Ex
Questions & Answers | Latest Already Graded A+ UPDATE 2025|2026!!
mestic wastewater, both dissolved and suspended,
are inorganics?
19. Wastewater sources & characteristics: 87%
Approx. what % of the dissolved solids in wastewater
are inorganics
20. Wastewater sources & characteristics: 12%
Approximately what % of the dissolved solids in waste-
water are organics
21. Wastewater sources & characteristics: free-swimming ciliates
Which organism wold most probably be associated
with moderate sludge age and effluent water quality
22. Wastewater sources & characteristics: amoebas
Which organism would most probably be associated
with high suspended solids and biochemical oxygen
demand (BOD)
23. Wastewater sources & characteristics: flagellates
High suspended solids and BOD are most probably
associated with which type of organisms?
24. Wastewater sources & characteristics: rotifers
What organism would most likely enhance the pene-
tration of oxygen into the activated sludge
