Waste Water practice exam questions
and answers with certified solutions
Odors occur when treatment becomes ✔✔Anaerobic
What should an operator do before entering a manhole ✔✔Test for all hazardous gases and
oxygen levels and ventilate the manhole before entering
What treatment devices is commonly used to separate and remove large solids from raw
wastewater ✔✔a mechanically raked bar screen
What diseases are caused by pathogenic organisms that may be present in raw wastewater?
✔✔Hepatitis, typhoid, paratyphoid, dysentery, and cholera
What is typically used to dewater sludge? ✔✔Belt press, Drying beds, solid bowl centrifuge, and
gravity thickener
Calculated the volume in gallons of a rectangular aeration tank that is 60 feet long, 30 feet wide
and 20 feet deep ✔✔269,280
, What is typically used whenever wastewater cannot flow to the treatment plant by gravity
✔✔Lift station
A centrifugal pump must be ? or it will not pump ✔✔Primed
One common type of weir design for measuring flow is ✔✔V-Knotch
The operator would need to increase or decrease if the ? loading on the plant is high
✔✔increase/Organic
A simple method for indication when to waste sludge is ✔✔Total sedimentation test
Landfill applied sludge must have a solids content of at least ? ✔✔20%
Effluent dosage of chlorine in the contact chamber must produce a total combined residual of ?
✔✔1.0mg/L after 20 minutes
and answers with certified solutions
Odors occur when treatment becomes ✔✔Anaerobic
What should an operator do before entering a manhole ✔✔Test for all hazardous gases and
oxygen levels and ventilate the manhole before entering
What treatment devices is commonly used to separate and remove large solids from raw
wastewater ✔✔a mechanically raked bar screen
What diseases are caused by pathogenic organisms that may be present in raw wastewater?
✔✔Hepatitis, typhoid, paratyphoid, dysentery, and cholera
What is typically used to dewater sludge? ✔✔Belt press, Drying beds, solid bowl centrifuge, and
gravity thickener
Calculated the volume in gallons of a rectangular aeration tank that is 60 feet long, 30 feet wide
and 20 feet deep ✔✔269,280
, What is typically used whenever wastewater cannot flow to the treatment plant by gravity
✔✔Lift station
A centrifugal pump must be ? or it will not pump ✔✔Primed
One common type of weir design for measuring flow is ✔✔V-Knotch
The operator would need to increase or decrease if the ? loading on the plant is high
✔✔increase/Organic
A simple method for indication when to waste sludge is ✔✔Total sedimentation test
Landfill applied sludge must have a solids content of at least ? ✔✔20%
Effluent dosage of chlorine in the contact chamber must produce a total combined residual of ?
✔✔1.0mg/L after 20 minutes
