WASTEWASTER TREATMENT GRADE 1
CERTIFICATION STUDY GUIDE 2026
Fatal after a few breaths - ANSWERSConcentrations of chlorine gas in excess of 1,000
ppm are...
Volume of the basin - ANSWERSRoutine weir maintenance should include checking
the...
Yellow-green, toxic and heavier than air - ANSWERSCorrect set of characteristics of
chlorine gas...
Mechanical seal - ANSWERSUnder normal operating conditions, which of the following
seal types has the longest life cycle?
Date, time and location of the sample collection - ANSWERSWhich of the following
should always be included on a sample label?
Hydrogen sulfide - ANSWERSWhich of the following gases has a rotten egg odor?
Increase the return sludge rate - ANSWERSWhen operating a package aeration plant,
an operator notices that the secondary clarifier sludge blanket is higher than normal and
the effluent appears turbid. The operator should...
Cavitation - ANSWERSWhich of the following is associated with low internal pressures
or excessively high flow rates that are structurally detrimental to centrifugal pumps?
Wastewater containing high organic load - ANSWERSA sample of raw wastewater has
a carbonaceous biochemical oxygen demand (CBOD) concentration of 450 ppm. This
most likely indicates...
15 hr - ANSWERSIn a small town, wastewater is pumped from a lift station with a pump
having a capacity of 200 gpm (757 Lpm). The station receives 180,000 gal (681,300L)
of water during an average day. How many hours of run time will this pump have per
day?
Water - ANSWERSChlorine is very corrosive when combined with...
Parshall flume - ANSWERSThe most commonly used device to measure large
wastewater flow is a...
Add acid to the water first - ANSWERSWhat is the proper way to mix water and acid?
, A weir - ANSWERSThe simplest device used to measure flow in open channels is...
Sodium chloride - ANSWERSWhich of the following chemicals is beneficial in correcting
the problem that causes a facultative pond to change from a deep bright green to a dull
gray color?
Guide wire - ANSWERSFloating surface aerators are secured using a...
amps - ANSWERSElectrical current draw rate is measured in
Check all hand-operated valves for operator orientation - ANSWERSBefore starting a
new pump, an operator should do which of the following firat?
Each employee - ANSWERSWho is responsible for ensuring that safety rules are
followed throughout a treatment plant?
Volatile acids/alkalinity ratio - ANSWERSWhich of the following is most commonly used
to determine stabilization of solids in an aerobic digester?
Changing the oil in a centrifugal pump every 1,000 hours is an example of which of the
following
maintenance practices? - ANSWERSPreventative
For a dry chemical feeder feeding 2.65 lb(1.2kg) of chemical in 5 minutes, what is the
feed rate? - ANSWERS763 lb/day (346 kg/day)
When starting up a new activated sludge plant, an operator should build up MLSS to the
desired concentration as quickly as possible. Which of the following actions will achieve
this? - ANSWERSDo not waste sludge
When checking the bearings on an electric motor, which of the following is a useful tool
to pinpoint the problem? - ANSWERSVibration meter
Coliform results are high for a facultative pond that discharges to surface water. The
flow & temperature have remained constant since the testing. Which of the following
operational changes should be made to bring the coliform results down? -
ANSWERSIncrease the chlorine dose to the effluent in order to bring the residual up
All piping connections in a chlorine gas system should be checked for leaks by? -
ANSWERSReleasing ammonia vapors near each connection
At what time should an operator sample a facultative lagoon to find the system's
minimum dissolved oxygen level? - ANSWERS5:00 Am
Which of the following are extremely viscous & slippery? - ANSWERSPolymers
CERTIFICATION STUDY GUIDE 2026
Fatal after a few breaths - ANSWERSConcentrations of chlorine gas in excess of 1,000
ppm are...
Volume of the basin - ANSWERSRoutine weir maintenance should include checking
the...
Yellow-green, toxic and heavier than air - ANSWERSCorrect set of characteristics of
chlorine gas...
Mechanical seal - ANSWERSUnder normal operating conditions, which of the following
seal types has the longest life cycle?
Date, time and location of the sample collection - ANSWERSWhich of the following
should always be included on a sample label?
Hydrogen sulfide - ANSWERSWhich of the following gases has a rotten egg odor?
Increase the return sludge rate - ANSWERSWhen operating a package aeration plant,
an operator notices that the secondary clarifier sludge blanket is higher than normal and
the effluent appears turbid. The operator should...
Cavitation - ANSWERSWhich of the following is associated with low internal pressures
or excessively high flow rates that are structurally detrimental to centrifugal pumps?
Wastewater containing high organic load - ANSWERSA sample of raw wastewater has
a carbonaceous biochemical oxygen demand (CBOD) concentration of 450 ppm. This
most likely indicates...
15 hr - ANSWERSIn a small town, wastewater is pumped from a lift station with a pump
having a capacity of 200 gpm (757 Lpm). The station receives 180,000 gal (681,300L)
of water during an average day. How many hours of run time will this pump have per
day?
Water - ANSWERSChlorine is very corrosive when combined with...
Parshall flume - ANSWERSThe most commonly used device to measure large
wastewater flow is a...
Add acid to the water first - ANSWERSWhat is the proper way to mix water and acid?
, A weir - ANSWERSThe simplest device used to measure flow in open channels is...
Sodium chloride - ANSWERSWhich of the following chemicals is beneficial in correcting
the problem that causes a facultative pond to change from a deep bright green to a dull
gray color?
Guide wire - ANSWERSFloating surface aerators are secured using a...
amps - ANSWERSElectrical current draw rate is measured in
Check all hand-operated valves for operator orientation - ANSWERSBefore starting a
new pump, an operator should do which of the following firat?
Each employee - ANSWERSWho is responsible for ensuring that safety rules are
followed throughout a treatment plant?
Volatile acids/alkalinity ratio - ANSWERSWhich of the following is most commonly used
to determine stabilization of solids in an aerobic digester?
Changing the oil in a centrifugal pump every 1,000 hours is an example of which of the
following
maintenance practices? - ANSWERSPreventative
For a dry chemical feeder feeding 2.65 lb(1.2kg) of chemical in 5 minutes, what is the
feed rate? - ANSWERS763 lb/day (346 kg/day)
When starting up a new activated sludge plant, an operator should build up MLSS to the
desired concentration as quickly as possible. Which of the following actions will achieve
this? - ANSWERSDo not waste sludge
When checking the bearings on an electric motor, which of the following is a useful tool
to pinpoint the problem? - ANSWERSVibration meter
Coliform results are high for a facultative pond that discharges to surface water. The
flow & temperature have remained constant since the testing. Which of the following
operational changes should be made to bring the coliform results down? -
ANSWERSIncrease the chlorine dose to the effluent in order to bring the residual up
All piping connections in a chlorine gas system should be checked for leaks by? -
ANSWERSReleasing ammonia vapors near each connection
At what time should an operator sample a facultative lagoon to find the system's
minimum dissolved oxygen level? - ANSWERS5:00 Am
Which of the following are extremely viscous & slippery? - ANSWERSPolymers
