WASTEWATER OPERATOR CERTIFICATION EXAM
/ CONCRETE QUESTIONS AND SOLID ANSWERS /
GRADED A+
General Wastewater Treatment:
What is the pressure head caused by?
Water elevation
General Wastewater Treatment:
What color should the piping be that contains reclaimed water?
purple
General Wastewater Treatment:
What is the term for the height to which a column of water will
rise in a well.
piezometric surface
General Wastewater Treatment:
In general, what is the maximum practical lift of pumps
15-25ft
General Wastewater Treatment:
Which one of the following valves is the best to use in throttling a
flow situation?
a. gate
b. butterfly
c. globe
d. ball
c. globe
General Wastewater Treatment:
Which one of the following devices is used to measure water
depths in storage facilities?
a. transducer
b. Venturi meter
,c. magnetic sensor
d. thermistor
transducer
Wastewater Treatment Facilities:
The velocity in sanitary sewers is approximately:
2 ft/s
Wastewater Treatment Facilities:
The distance between manholes ranges from
300-500ft
Wastewater Treatment Facilities:
What should the flow velocity be through a grit channel
1.0 ft/s
Wastewater Treatment Facilities:
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
remove some of the organic matter
Wastewater Treatment Facilities:
The most common flow-measure device for wastewater is a_____
parshall flume
Wastewater Treatment Facilities:
The detention time for primary clarifiers usually has a range
of_____hr/s
1.5-2hr
Wastewater Treatment Facilities:
The effluent from which process is called mixed liquor
a.secondary clarification
,b. primary clarification
c. sludge drying bed or pond
d. activated sludge
activated sludge
Wastewater Treatment Facilities:
Aerobic ponds usually range in depth from ___-____ft
3-6ft
Wastewater Treatment Facilities:
Anaerobic ponds usually range in depth from___-___ft
8-12ft
Wastewater Treatment Facilities:
Another name for a waste stabilization pond is
raw wastewater lagoon
Wastewater sources & characteristics:
Typically what average percent of total solids in a domestic
wastewater, both dissolved and suspended, are inorganics
50%
Wastewater sources & characteristics:
Typically, what average percent of total solids in domestic
wastewater, both dissolved and suspended, are inorganics?
50%
Wastewater sources & characteristics:
Approx. what % of the dissolved solids in wastewater are
inorganics
87%
Wastewater sources & characteristics:
Approximately what % of the dissolved solids in wastewater are
organics
12%
, Wastewater sources & characteristics:
Which organism wold most probably be associated with moderate
sludge age and effluent water quality
free-swimming ciliates
Wastewater sources & characteristics:
Which organism would most probably be associated with high
suspended solids and biochemical oxygen demand (BOD)
amoebas
Wastewater sources & characteristics:
High suspended solids and BOD are most probably associated
with which type of organisms?
flagellates
Wastewater sources & characteristics:
What organism would most likely enhance the penetration of
oxygen into the activated sludge
rotifers
Rocks/Screens/Comminutors & Grit Removal:
Chlorine gas has a specific gravity of
2.5 specific gravity
Rocks/Screens/Comminutors & Grit Removal:
Proper flow velocity through a grit channel is indicated when the
grit being removed contains
a. no organics
b. a little organic material
c. about half the volume as the grit being removed
d. about the same volume as the grit being removed
a little organic material
Sedimentation and Flotation:
Surface loading and detention time is a clarifier are directly
related to:
/ CONCRETE QUESTIONS AND SOLID ANSWERS /
GRADED A+
General Wastewater Treatment:
What is the pressure head caused by?
Water elevation
General Wastewater Treatment:
What color should the piping be that contains reclaimed water?
purple
General Wastewater Treatment:
What is the term for the height to which a column of water will
rise in a well.
piezometric surface
General Wastewater Treatment:
In general, what is the maximum practical lift of pumps
15-25ft
General Wastewater Treatment:
Which one of the following valves is the best to use in throttling a
flow situation?
a. gate
b. butterfly
c. globe
d. ball
c. globe
General Wastewater Treatment:
Which one of the following devices is used to measure water
depths in storage facilities?
a. transducer
b. Venturi meter
,c. magnetic sensor
d. thermistor
transducer
Wastewater Treatment Facilities:
The velocity in sanitary sewers is approximately:
2 ft/s
Wastewater Treatment Facilities:
The distance between manholes ranges from
300-500ft
Wastewater Treatment Facilities:
What should the flow velocity be through a grit channel
1.0 ft/s
Wastewater Treatment Facilities:
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
remove some of the organic matter
Wastewater Treatment Facilities:
The most common flow-measure device for wastewater is a_____
parshall flume
Wastewater Treatment Facilities:
The detention time for primary clarifiers usually has a range
of_____hr/s
1.5-2hr
Wastewater Treatment Facilities:
The effluent from which process is called mixed liquor
a.secondary clarification
,b. primary clarification
c. sludge drying bed or pond
d. activated sludge
activated sludge
Wastewater Treatment Facilities:
Aerobic ponds usually range in depth from ___-____ft
3-6ft
Wastewater Treatment Facilities:
Anaerobic ponds usually range in depth from___-___ft
8-12ft
Wastewater Treatment Facilities:
Another name for a waste stabilization pond is
raw wastewater lagoon
Wastewater sources & characteristics:
Typically what average percent of total solids in a domestic
wastewater, both dissolved and suspended, are inorganics
50%
Wastewater sources & characteristics:
Typically, what average percent of total solids in domestic
wastewater, both dissolved and suspended, are inorganics?
50%
Wastewater sources & characteristics:
Approx. what % of the dissolved solids in wastewater are
inorganics
87%
Wastewater sources & characteristics:
Approximately what % of the dissolved solids in wastewater are
organics
12%
, Wastewater sources & characteristics:
Which organism wold most probably be associated with moderate
sludge age and effluent water quality
free-swimming ciliates
Wastewater sources & characteristics:
Which organism would most probably be associated with high
suspended solids and biochemical oxygen demand (BOD)
amoebas
Wastewater sources & characteristics:
High suspended solids and BOD are most probably associated
with which type of organisms?
flagellates
Wastewater sources & characteristics:
What organism would most likely enhance the penetration of
oxygen into the activated sludge
rotifers
Rocks/Screens/Comminutors & Grit Removal:
Chlorine gas has a specific gravity of
2.5 specific gravity
Rocks/Screens/Comminutors & Grit Removal:
Proper flow velocity through a grit channel is indicated when the
grit being removed contains
a. no organics
b. a little organic material
c. about half the volume as the grit being removed
d. about the same volume as the grit being removed
a little organic material
Sedimentation and Flotation:
Surface loading and detention time is a clarifier are directly
related to:
