Wastewater Operator Class 1 & 2
Practice Test questions with
answers
Flow measurement system where flow stream contents
are collected in container for fixed period of time -
CORRECT ANSWERS ✔✔Timed gravimetric
Uses a strong oxidizer to break down organic material -
CORRECT ANSWERS ✔✔Chemically Oxidizable Carbon
(COD)
a measure of carbon dioxide given off when material is
heated to 550° - CORRECT ANSWERS ✔✔Total Organic
Carbon (TOC)
What is the recommended detention time for a primary
clarifier? - CORRECT ANSWERS ✔✔1 1/2 - 2 hours
What would be added to a lagoon/pond to subdue a
strong odor and increase oxygen (O2)? - CORRECT
ANSWERS ✔✔Sodium Nitrate
,What is the maximum holding time for fecal coliform
alanyses? - CORRECT ANSWERS ✔✔6 hours
What sort of system do lagoons/ponds form for the
wastewater organix population? - CORRECT ANSWERS
✔✔Aerobic, Anaerobic, Facultative
What is the primary function of a brush aerator? -
CORRECT ANSWERS ✔✔To produce great dissolved
oxygen (DO)
If the first pond in a series operation is organically
overloaded, how should the flow be controlled? -
CORRECT ANSWERS ✔✔They should be switched to
parallel operation
What should the operator do with plants/weeds growing
along the water's edge with respect to ponds? - CORRECT
ANSWERS ✔✔Remove them as they appear to avoid the
establishment of a deep root system
How should lantern rings be installed on the stuffing box
as part of a pump unit? - CORRECT ANSWERS
✔✔Completely filled with grease before all the rings of
packing are in place.
, What are the pH parameters outlined by KPDES in the
process of wastewater treatment? - CORRECT ANSWERS
✔✔6.0 - 9.0 ppm
The explosive range of the main product of anaerobic
digestion, methane, is in the range of: - CORRECT
ANSWERS ✔✔5-15%
Recirculation in a tricking filter operation is sometimes
used with trickling filters to: - CORRECT ANSWERS
✔✔Keep the media wet during low flow periods, dilute the
organic strength of the influent, and smooth out diurnal
flow fluctuations
Small quantities of sludge should be pumped often in
primary clarifiers to: - CORRECT ANSWERS ✔✔To prevent
hydraulic & organic overloading of the digester and to
keep sludge blankets down so that the septic "floating"
sludge will not result.
In an active oxidation ditch, how long should a measured
amount of wastewater treated before going to the next
stage? - CORRECT ANSWERS ✔✔18-36 hours
Fish such as salmon and trout cannon tolerate more than
trace amounts of chlorine. therefore, a total residual
Practice Test questions with
answers
Flow measurement system where flow stream contents
are collected in container for fixed period of time -
CORRECT ANSWERS ✔✔Timed gravimetric
Uses a strong oxidizer to break down organic material -
CORRECT ANSWERS ✔✔Chemically Oxidizable Carbon
(COD)
a measure of carbon dioxide given off when material is
heated to 550° - CORRECT ANSWERS ✔✔Total Organic
Carbon (TOC)
What is the recommended detention time for a primary
clarifier? - CORRECT ANSWERS ✔✔1 1/2 - 2 hours
What would be added to a lagoon/pond to subdue a
strong odor and increase oxygen (O2)? - CORRECT
ANSWERS ✔✔Sodium Nitrate
,What is the maximum holding time for fecal coliform
alanyses? - CORRECT ANSWERS ✔✔6 hours
What sort of system do lagoons/ponds form for the
wastewater organix population? - CORRECT ANSWERS
✔✔Aerobic, Anaerobic, Facultative
What is the primary function of a brush aerator? -
CORRECT ANSWERS ✔✔To produce great dissolved
oxygen (DO)
If the first pond in a series operation is organically
overloaded, how should the flow be controlled? -
CORRECT ANSWERS ✔✔They should be switched to
parallel operation
What should the operator do with plants/weeds growing
along the water's edge with respect to ponds? - CORRECT
ANSWERS ✔✔Remove them as they appear to avoid the
establishment of a deep root system
How should lantern rings be installed on the stuffing box
as part of a pump unit? - CORRECT ANSWERS
✔✔Completely filled with grease before all the rings of
packing are in place.
, What are the pH parameters outlined by KPDES in the
process of wastewater treatment? - CORRECT ANSWERS
✔✔6.0 - 9.0 ppm
The explosive range of the main product of anaerobic
digestion, methane, is in the range of: - CORRECT
ANSWERS ✔✔5-15%
Recirculation in a tricking filter operation is sometimes
used with trickling filters to: - CORRECT ANSWERS
✔✔Keep the media wet during low flow periods, dilute the
organic strength of the influent, and smooth out diurnal
flow fluctuations
Small quantities of sludge should be pumped often in
primary clarifiers to: - CORRECT ANSWERS ✔✔To prevent
hydraulic & organic overloading of the digester and to
keep sludge blankets down so that the septic "floating"
sludge will not result.
In an active oxidation ditch, how long should a measured
amount of wastewater treated before going to the next
stage? - CORRECT ANSWERS ✔✔18-36 hours
Fish such as salmon and trout cannon tolerate more than
trace amounts of chlorine. therefore, a total residual
