WasteWater Operator Certification
Study Guide Grade 1 Exam Questions
with Correct Verified Solutions 100%
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Wastewater Treatment Facilities:
Another name for primary treatment is - ANS ✓sedimentation
Wastewater Treatment Facilities:
Digester gas is_______when mixed with air the proper proportions - ANS
✓extremely explosive
Wastewater Treatment Facilities:
A pond that is used to treat raw wastewater is called - ANS ✓a waste
stabilization pond
Wastewater Treatment Facilities:
A pond that has an aerobic top layer and an anaerobic bottom layer is
called - ANS ✓a facultative pond
WasteWater Operator
, 2
WasteWater
Preliminary Treatment:
What is the angle of the bars on a manually cleaned bar screen? - ANS ✓30
degrees
Preliminary Treatment:
What is the angle of the bards on a mechanically cleaned bar screen - ANS
✓45-60 degrees
Preliminary Treatment:
What is the ideal wastewater velocity in FPS through a screen channel? -
ANS ✓1.5ft/s
Preliminary Treatment:
What is the ideal wastewater velocity in FPS for grit removal in a grit
chamber - ANS ✓1.0 ft/s
Preliminary Treatment:
In general, what is the water content of screen material - ANS ✓80%
Preliminary Treatment:
What is the wastewater velocity range in FPS for grit removal in a grit
chamber? - ANS ✓0.7 - 1.4 ft/s
WasteWater Operator
, 3
WasteWater
Racks, screens, comminutors and Grit removal:
Which one of the following chemicals gives water its greatest capacity to
neutralize acids? - ANS ✓hydroxide
Racks, screens, comminutors and Grit removal:
The bar rack is used - ANS ✓when the bar screen is out of service
Primary Sedimentation:
Typically, what is the average detention time for wastewater in a primary
clarifier? - ANS ✓2 hr
Sedimentation and Flotation:
Name one gas this irritates the "eyes" - ANS ✓chlorine
Primary Sedimentation:
Activated sludge clarifiers accept material to be settled from - ANS ✓an
aeration tank
Primary Sedimentation:
According to CWA, secondary treatment is defines as a wastewater plant
producing an effluent that has no more than____total suspended solids and
no more than_____BOD5 - ANS ✓30 mg/L, 30 mg/L
WasteWater Operator
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