wastewater practice exam
Odours occur when treatment becomes - correct answer-Anaerobic
What should an operator do before entering a manhole - correct answer-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 - correct answer-a mechanically raked bar screen
What diseases are caused by pathogenic organisms that may be present in raw
wastewater? - correct answer-Hepatitis, typhoid, paratyphoid, dysentery, and cholera
What is typically used to dewater sludge? - correct answer-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 - correct answer-269,280
What is typically used whenever wastewater cannot flow to the treatment plant by gravity -
correct answer-Lift station
A centrifugal pump must be ? or it will not pump - correct answer-Primed
One common type of weir design for measuring flow is - correct answer-V-Knotch
The operator would need to increase or decrease if the ? loading on the plant is high -
correct answer-increase/Organic
A simple method for indication when to waste sludge is - correct answer-Total sedimentation
test
Landfill applied sludge must have a solids content of at least ? - correct answer-20%
Effluent dosage of chlorine in the contact chamber must produce a total combined residual
of ? - correct answer-1.0mg/L after 20 minutes
TCEQ allows the reuse of wastewater, some of these uses include - correct
answer-irrigation, aquifer recharge, cooling towers and fire protection
Organic solids include - correct answer-organic materials from plant, animals or humans
Dangerous gases are produced during bacterial decomposition of organics in wastewater.
The main gases are - correct answer-Hydrogen sulfide, carbon dioxide and methane
Odours occur when treatment becomes - correct answer-Anaerobic
What should an operator do before entering a manhole - correct answer-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 - correct answer-a mechanically raked bar screen
What diseases are caused by pathogenic organisms that may be present in raw
wastewater? - correct answer-Hepatitis, typhoid, paratyphoid, dysentery, and cholera
What is typically used to dewater sludge? - correct answer-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 - correct answer-269,280
What is typically used whenever wastewater cannot flow to the treatment plant by gravity -
correct answer-Lift station
A centrifugal pump must be ? or it will not pump - correct answer-Primed
One common type of weir design for measuring flow is - correct answer-V-Knotch
The operator would need to increase or decrease if the ? loading on the plant is high -
correct answer-increase/Organic
A simple method for indication when to waste sludge is - correct answer-Total sedimentation
test
Landfill applied sludge must have a solids content of at least ? - correct answer-20%
Effluent dosage of chlorine in the contact chamber must produce a total combined residual
of ? - correct answer-1.0mg/L after 20 minutes
TCEQ allows the reuse of wastewater, some of these uses include - correct
answer-irrigation, aquifer recharge, cooling towers and fire protection
Organic solids include - correct answer-organic materials from plant, animals or humans
Dangerous gases are produced during bacterial decomposition of organics in wastewater.
The main gases are - correct answer-Hydrogen sulfide, carbon dioxide and methane
