Wastewater Operator certification Study Guide-Grade 2 Test with Answers Rated A

Wastewater Operator certification Study Guide-Grade 2 Test with Answers
Rated A
General Wastewater Treatment:
Water elevation
What is the pressure head caused by?
General Wastewater Treatment:
purple
What color should the piping be that contains reclaimed
water?
General Wastewater Treatment:
piezometric surface
What is the term for the height to which a column of water
will rise in a well.
General Wastewater Treatment:
15-25ft
In general, what is the maximum practical lift of pumps
General Wastewater Treatment:

Which one of the following valves is the best to use in
throttling a flow situation?
globe
a. gate
b. butterfly
c. globe
d. ball
General Wastewater Treatment:

Which one of the following devices is used to measure
water depths in storage facilities?
transducer
a. transducer
b. Venturi meter
c. magnetic sensor
d. thermistor



,Wastewater Operator certification Study Guide-Grade 2 Test with Answers
Rated A
Wastewater Treatment Facilities:
2 ft/s
The velocity in sanitary sewers is approximately:
Wastewater Treatment Facilities:
300-500ft
The distance between manholes ranges from
Wastewater Treatment Facilities:
1.0 ft/s
What should the flow velocity be through a grit channel
Wastewater Treatment Facilities:

Grit washers are used to

a. remove some of the organic matter remove some of the organic matter
b. remove large pieces of wood
c. remove rags and eggshells
d. remove the odors
Wastewater Treatment Facilities:
parshall flume
The most common flow-measure device for wastewater is
a
Wastewater Treatment Facilities:
1.5-2hr
The detention time for primary clarifiers usually has a
range of hr/s

Wastewater Treatment Facilities:

The effluent from which process is called mixed liquor
activated sludge
a.secondary clarification
b. primary clarification


,Wastewater Operator certification Study Guide-Grade 2 Test with Answers
Rated A
c. sludge drying bed or pond
d. activated sludge
Wastewater Treatment Facilities:
3-6ft
Aerobic ponds usually range in depth from - ft
Wastewater Treatment Facilities:
8-12ft
Anaerobic ponds usually range in depth from - ft
Wastewater Treatment Facilities:
raw wastewater lagoon
Another name for a waste stabilization pond is
Wastewater sources & characteristics:

Typically what average percent of total solids in a domestic 50%
wastewater, both dissolved and suspended, are inorgan-
ics
Wastewater sources & characteristics:

Typically, what average percent of total solids in domestic 50%
wastewater, both dissolved and suspended, are inorgan-
ics?
Wastewater sources & characteristics:
87%
Approx. what % of the dissolved solids in wastewater are
inorganics
Wastewater sources & characteristics:
12%
Approximately what % of the dissolved solids in waste-
water are organics
Wastewater sources & characteristics:



, Wastewater Operator certification Study Guide-Grade 2 Test with Answers
Rated A
Which organism wold most probably be associated with
free-swimming ciliates
moderate sludge age and effluent water quality
Wastewater sources & characteristics:

Which organism would most probably be associated with amoebas
high suspended solids and biochemical oxygen demand
(BOD)
Wastewater sources & characteristics:
flagellates
High suspended solids and BOD are most probably asso-
ciated with which type of organisms?
Wastewater sources & characteristics:
rotifers
What organism would most likely enhance the penetra-
tion of oxygen into the activated sludge
Rocks/Screens/Comminutors & Grit Removal:
2.5 specific gravity
Chlorine gas has a specific gravity of
Rocks/Screens/Comminutors & Grit Removal:

Proper flow velocity through a grit channel is indicated
when the grit being removed contains
a little organic material
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
Sedimentation and Flotation:
flow through a clarifier
Surface loading and detention time is a clarifier are direct-
ly related to: