Florida Wastewater Class B Exam 2026 Prep with a Review
of 350 Questions and Correct Answers/ FL Class B
Wastewater Operator Exam 2026-2027 A Review of
Correctly Answered Practice Questions
in up-flow clarifiers, when the sludge is of normal density but is very close to the
surface, you should: - ANSWER-waste more sludge
in observation of an increase in source water turbidity levels, to avoid plant upset,
the first action that should be performed is : - ANSWER-verify the effectiveness
of the coagulant chemical and dosage.
the sludge blanket in an up flow clarifier is poorly formed and softening efficiency
is less than expected. to correct the problem, you should: - ANSWER-increase
recirculation of sludge
when treating extremely cold water in a solids contact unit, you may consider
increasing the chemical dosage of: - ANSWER-polymer
you are operating a solids contact unit and at mid-day you begin to see some
billowing-like clouds of floc particles near the surface. Finished water turbidity is
0.1 NTU. what is causing this condition? - ANSWER-heating from the sun.
the effluent weir of settling tanks should be level in order to prevent: - ANSWER-
an uneven flow and short circuiting
the purpose of the baffle at the inlet end of a tank is to : - ANSWER-cause flow
into the tank to be disturbed
1
,the single most important water quality indicator used for process control of the
sedimentation process is : - ANSWER-turbidity
the following statement is not correct in regards to short circuiting in sedimentation
basins: - ANSWER-short circuiting allows for uniform horizontal flow across the
basin.
How does an operator achieve peak performance of a gravity thickener? -
ANSWER-By adjusting the sludge withdrawal rate, By controlling the sludge
blanket depth, By controlling the speed of the sludge collection mechanism.
Which factors determine the air requirements for an aerobic digester? -
ANSWER-Desire to keep the digester solids in suspension (well mixed) and a
Desire to maintain a dissolved oxygen (DO) concentration of 1 to 2 mg/L within
the digester
In order to create a suitable environment for composting, Which guidelines must
be met? - ANSWER-Aeration must be sufficient to maintain aerobic conditions in
the composting material , Proper moisture content and temperatures must be
maintained, ' The wastewater sludges must be blended with previously composted
material or bulking agents such as saw-dust, straw, wood shavings, or rice hulls
Physical-chemical treatment consists of which processes? - ANSWER-
Coagulation , Flocculation, and Liquid/solids separation
Which items are chemical treatment hazards? - ANSWER-Dust in the air, High
temperatures, Slippery walk areas, Strong acids, and Strong caustics
Which items should be checked before chemical feeder start-up? - ANSWER-1.
Be sure that the chemical to be fed is available
2
,2. Confirm that the manufacturer's lubrication and startup procedures are being
followed
3. Determine the proper positions for all valves
4. Examine all fittings, inspection plates, and drains to ensure that they will not
leak when placed into service
5. Inspect the electrical system for proper voltage, for properly sized overload
protection, and for proper operation of control lights on the control panel
Which items should be checked before starting a filtering system? - ANSWER-1.
Check motors and drives for proper alignment, for proper safety guards, and for
free rotation
2. Examine motors, drive units, and bearings for proper lubrication
3. Fill tanks and piping and look for leaks
4. Inspect pumps and motors for excessive vibration
5. Inspect the total system for safety hazards
there is a sudden increase in filter head-loss. conditions indicate media surface
sealing. What action should be taken: - ANSWER-assess overall process
performance, jar test if indicated. The most likely problem is primary coagulant or
filter aid over feed.
air bound filters are caused by : - ANSWER-release of dissolved air in saturated
cold water
after backwashing, excessive head loss remains through the filter. what should be
checked? - ANSWER-under drain system and head loss measuring equipment
mud ball evaluation indicates a sample to be 2.5% to 5%. this is considered to be: -
ANSWER-bad
3
, if you notice uneven backwash on your filter surface, what problem can you as an
operator expect in the near future? - ANSWER-possible formation of mud balls at
dead areas, poor filtration water quality, and shorter filter runs.
an operator an evaluate the backwash process by observing the: - ANSWER-
clarity of the waste water at the end of the backwash cycle.
the minimum turbidity and head loss monitoring frequency for the filter effluent is:
- ANSWER-4 times per shift for turbidity and 3 times per shift for head loss.
air bound filters will occur when: - ANSWER-head loss exceeds the head of water
over the media
after backwashing, excessive head loss remains through the filter. What should be
checked? - ANSWER-under drain system and head loss measuring equipment
mud balls sink more readily in anthracite. The proper depth in the anthracite to
sample for mud bass is: - ANSWER-bottom 6 "
Early turbidity breakthrough or rapid head loss build up on a conventional filter
plant operation can often result from: - ANSWER-poor chemical treatment
the following chemical in excess would most likely increase the head loss on the
filters: - ANSWER-anionic polymer
a filter becomes air bound: - ANSWER-by the release of of dissolved air in
saturated, cold water
4
of 350 Questions and Correct Answers/ FL Class B
Wastewater Operator Exam 2026-2027 A Review of
Correctly Answered Practice Questions
in up-flow clarifiers, when the sludge is of normal density but is very close to the
surface, you should: - ANSWER-waste more sludge
in observation of an increase in source water turbidity levels, to avoid plant upset,
the first action that should be performed is : - ANSWER-verify the effectiveness
of the coagulant chemical and dosage.
the sludge blanket in an up flow clarifier is poorly formed and softening efficiency
is less than expected. to correct the problem, you should: - ANSWER-increase
recirculation of sludge
when treating extremely cold water in a solids contact unit, you may consider
increasing the chemical dosage of: - ANSWER-polymer
you are operating a solids contact unit and at mid-day you begin to see some
billowing-like clouds of floc particles near the surface. Finished water turbidity is
0.1 NTU. what is causing this condition? - ANSWER-heating from the sun.
the effluent weir of settling tanks should be level in order to prevent: - ANSWER-
an uneven flow and short circuiting
the purpose of the baffle at the inlet end of a tank is to : - ANSWER-cause flow
into the tank to be disturbed
1
,the single most important water quality indicator used for process control of the
sedimentation process is : - ANSWER-turbidity
the following statement is not correct in regards to short circuiting in sedimentation
basins: - ANSWER-short circuiting allows for uniform horizontal flow across the
basin.
How does an operator achieve peak performance of a gravity thickener? -
ANSWER-By adjusting the sludge withdrawal rate, By controlling the sludge
blanket depth, By controlling the speed of the sludge collection mechanism.
Which factors determine the air requirements for an aerobic digester? -
ANSWER-Desire to keep the digester solids in suspension (well mixed) and a
Desire to maintain a dissolved oxygen (DO) concentration of 1 to 2 mg/L within
the digester
In order to create a suitable environment for composting, Which guidelines must
be met? - ANSWER-Aeration must be sufficient to maintain aerobic conditions in
the composting material , Proper moisture content and temperatures must be
maintained, ' The wastewater sludges must be blended with previously composted
material or bulking agents such as saw-dust, straw, wood shavings, or rice hulls
Physical-chemical treatment consists of which processes? - ANSWER-
Coagulation , Flocculation, and Liquid/solids separation
Which items are chemical treatment hazards? - ANSWER-Dust in the air, High
temperatures, Slippery walk areas, Strong acids, and Strong caustics
Which items should be checked before chemical feeder start-up? - ANSWER-1.
Be sure that the chemical to be fed is available
2
,2. Confirm that the manufacturer's lubrication and startup procedures are being
followed
3. Determine the proper positions for all valves
4. Examine all fittings, inspection plates, and drains to ensure that they will not
leak when placed into service
5. Inspect the electrical system for proper voltage, for properly sized overload
protection, and for proper operation of control lights on the control panel
Which items should be checked before starting a filtering system? - ANSWER-1.
Check motors and drives for proper alignment, for proper safety guards, and for
free rotation
2. Examine motors, drive units, and bearings for proper lubrication
3. Fill tanks and piping and look for leaks
4. Inspect pumps and motors for excessive vibration
5. Inspect the total system for safety hazards
there is a sudden increase in filter head-loss. conditions indicate media surface
sealing. What action should be taken: - ANSWER-assess overall process
performance, jar test if indicated. The most likely problem is primary coagulant or
filter aid over feed.
air bound filters are caused by : - ANSWER-release of dissolved air in saturated
cold water
after backwashing, excessive head loss remains through the filter. what should be
checked? - ANSWER-under drain system and head loss measuring equipment
mud ball evaluation indicates a sample to be 2.5% to 5%. this is considered to be: -
ANSWER-bad
3
, if you notice uneven backwash on your filter surface, what problem can you as an
operator expect in the near future? - ANSWER-possible formation of mud balls at
dead areas, poor filtration water quality, and shorter filter runs.
an operator an evaluate the backwash process by observing the: - ANSWER-
clarity of the waste water at the end of the backwash cycle.
the minimum turbidity and head loss monitoring frequency for the filter effluent is:
- ANSWER-4 times per shift for turbidity and 3 times per shift for head loss.
air bound filters will occur when: - ANSWER-head loss exceeds the head of water
over the media
after backwashing, excessive head loss remains through the filter. What should be
checked? - ANSWER-under drain system and head loss measuring equipment
mud balls sink more readily in anthracite. The proper depth in the anthracite to
sample for mud bass is: - ANSWER-bottom 6 "
Early turbidity breakthrough or rapid head loss build up on a conventional filter
plant operation can often result from: - ANSWER-poor chemical treatment
the following chemical in excess would most likely increase the head loss on the
filters: - ANSWER-anionic polymer
a filter becomes air bound: - ANSWER-by the release of of dissolved air in
saturated, cold water
4
