WASTEWATER OPERATOR C EXAMS EVALUATION
QUESTIONS AND ANSWERS RATED A+
✔✔Basic WasteWater Treatment:
Septic conditions are caused by - ✔✔anaerobic bacteria
✔✔Basic WasteWater Treatment:
Scum is usually removed in the _____treatment stage - ✔✔primary
✔✔Basic WasteWater Treatment:
When domestic wastewater enters natural waters, what species deplete most of the
oxygen - ✔✔aerobic bacteria
✔✔Basic WasteWater Treatment:
Once the oxygen is depleted in a natural body of water, which organisms take over? -
✔✔anaerobic
✔✔Basic WasteWater Treatment:
The major gas produces by anaerobic decomposition is - ✔✔methane
✔✔Wastewater Treatment Facilities:
Another name for promary treatment is - ✔✔sedimentation
✔✔Wastewater Treatment Facilities:
Digester gas is_______when mixed with air the the proper proportions - ✔✔extremely
explosive
✔✔Wastewater Treatment Facilities:
A pond that is used to treat raw wastewater is called - ✔✔a waste stabilization pond
✔✔Wastewater Treatment Facilities:
A pond that has an aerobic top layer and an anaerobic bottom layer is called - ✔✔a
facultative pond
, ✔✔Preliminary Treatment:
What is the angle of the bars on a manually cleaned bar screen? - ✔✔30 degrees
✔✔Preliminary Treatment:
What is the angle of the bards on a mechanically cleaned bar screen - ✔✔45-60
degrees
✔✔Preliminary Treatment:
What is the ideal wastewater velocity in FPS through a screen channel? - ✔✔1.5ft/s
✔✔Preliminary Treatment:
What is the ideal wastewater velocity in FPS for grit removal in a grit chamber - ✔✔1.0
ft/s
✔✔Preliminary Treatment:
In general, what is the water content of screen material - ✔✔80%
✔✔Preliminary Treatment:
What is the wastewater velocity range in FPS for grit removal in a grit chamber? -
✔✔0.7 - 1.4 ft/s
✔✔Racks, screens, comminutors and Grit removal:
Which one of the following chemicals gives water its greatest capacity to neutralize
acids? - ✔✔hydroxide
✔✔Racks, screens, comminutors and Grit removal:
The bar rack is used - ✔✔when the bar screen is out of service
✔✔Primary Sedimentation:
Typically, what is the average detention time for wastewater in a primary clarifier? -
✔✔2 hr
✔✔Sedimentation and Flotation:
QUESTIONS AND ANSWERS RATED A+
✔✔Basic WasteWater Treatment:
Septic conditions are caused by - ✔✔anaerobic bacteria
✔✔Basic WasteWater Treatment:
Scum is usually removed in the _____treatment stage - ✔✔primary
✔✔Basic WasteWater Treatment:
When domestic wastewater enters natural waters, what species deplete most of the
oxygen - ✔✔aerobic bacteria
✔✔Basic WasteWater Treatment:
Once the oxygen is depleted in a natural body of water, which organisms take over? -
✔✔anaerobic
✔✔Basic WasteWater Treatment:
The major gas produces by anaerobic decomposition is - ✔✔methane
✔✔Wastewater Treatment Facilities:
Another name for promary treatment is - ✔✔sedimentation
✔✔Wastewater Treatment Facilities:
Digester gas is_______when mixed with air the the proper proportions - ✔✔extremely
explosive
✔✔Wastewater Treatment Facilities:
A pond that is used to treat raw wastewater is called - ✔✔a waste stabilization pond
✔✔Wastewater Treatment Facilities:
A pond that has an aerobic top layer and an anaerobic bottom layer is called - ✔✔a
facultative pond
, ✔✔Preliminary Treatment:
What is the angle of the bars on a manually cleaned bar screen? - ✔✔30 degrees
✔✔Preliminary Treatment:
What is the angle of the bards on a mechanically cleaned bar screen - ✔✔45-60
degrees
✔✔Preliminary Treatment:
What is the ideal wastewater velocity in FPS through a screen channel? - ✔✔1.5ft/s
✔✔Preliminary Treatment:
What is the ideal wastewater velocity in FPS for grit removal in a grit chamber - ✔✔1.0
ft/s
✔✔Preliminary Treatment:
In general, what is the water content of screen material - ✔✔80%
✔✔Preliminary Treatment:
What is the wastewater velocity range in FPS for grit removal in a grit chamber? -
✔✔0.7 - 1.4 ft/s
✔✔Racks, screens, comminutors and Grit removal:
Which one of the following chemicals gives water its greatest capacity to neutralize
acids? - ✔✔hydroxide
✔✔Racks, screens, comminutors and Grit removal:
The bar rack is used - ✔✔when the bar screen is out of service
✔✔Primary Sedimentation:
Typically, what is the average detention time for wastewater in a primary clarifier? -
✔✔2 hr
✔✔Sedimentation and Flotation:
