Florida Wastewater Operator class B
certification exam
A common remedy for activated sludge system problems is to increase
the waste sludge flow rate, when would an increase of WAS rate not be
activated
correct? When
answers correctstraggler Floc is present in clarifier and
settleometer
The chlorine residual is falling An inspection of the 150lb cylinder and
chlorine feed
equipment shows ice forming on the chlorine regulator and feed lines. The
best
to fixmethod
the falling chlorine residual is? correct answers Put another
chlorine cylinder
onlin
e
Caution must be used when adding caustic chemical to a
digester.
Lime can combine with carbon dioxide in the digester to form what
problem?A correct
answers dangerous
vacuum
How many gallons will the single piston, reciprocating sludge pump
discharge
minute perpiston bore (diameter) is 6 inches and the stroke length is 11
If the
inches?
pump Theat 99 revolutions per minute. correct answers
runs
134gpm
solve MCRT:
Flow:
3.6mgd
Basin volume:
5.0mg
MLSS:2350mg
/l
WAS
ss:4800mg/l
WAS flow:
Eff tss: 15mg/l correct answers 15
150000gpd
days
There are high suspended solids in the water applied to the filters due to
bulking
in sludge
the secondary
clarifiers.
Polymer is used as a filter aid chemical, but the effluent ability is
worsening.
What is the best method to correct the filter problem? correct answers Run
jar tests to best Polymer
determine
dosage
An advantage of a continuous backwash, up flow, deep bed sand filters
is? correct
answers Filters do not need to be taken out of service for
backwashing
The aeration tank dissolved oxygen has been running normal, 1.5 to 2.0
mg/L the whole
mont
h.
Today's D.O. reading has spiked to nearly 6.0 mg/L in the aeration tank and
the clarifier
and plant effluent or
cloudy.
, What is the most likely cause of the rise in D.O.? correct answers A toxic
shock load
cyanide hasofentered the
plant
Plant fecal coliform counts do not meet state
standards.
The chlorine supply is not the problem and there is adequate vacuum and
chlorine
the feedcontacting has no solids build up and the effluent flow is
chlorine
belowisdesign.
What the most likely cause of the poor fecal coliform kill? correct
answers demand
chlorine High from excessive nitrite in
effluent
The point, location or structure where wastewater discharges from a
sewer,conduit
other drain oris called what? correct answers
Outfall
The volatile acid to alkalinity ratio of a properly operating anaerobic
digester is
answers 0.1correct
parts acid to one part alkalinity
(0.1 : 1.0)
What is a disadvantage of running a digester in the thermophilic
temperature
correct answers range?
The higher costs of heating the digester with
natural gas
What condition of a surface water, river or stream will allow more DO
saturation?
correct answers Cold water
temperature
Solids are washing out of the secondary clarifier of the activated
sludgepersonnel
Plant plant. increase the RAS flow rate, which slows the problem
temporarily
then but after 30
it worsens
minutes.
What is the cause of the plant problem? correct answers Increase of
RAS flow the detention time in the
decreased
clarifier
When operating upflow, continuous backwash sand filter that is discharging
poor filtrate.
What should you check? correct answers
reject/washwater valves
When using lime to precipitate phosphorus from treated effluent, it is
importantthe
maintain to pH at or above correct
answers 11.0
Upward force of groundwater on sedimentation
tank?
groundwater depth: 6ft above tank
bottom
Tank width: 80ft
Tank length: 157ft long correct answers
wide
4,700,000lbs
Luxury uptake phosphorus removal method is failing to remove
permitted
Influent levels:
phosphorus is 8
mg/L.
Fermentation basin phosphorus level is 10
mg/L.
Aeration basin phosphorus is 8
mg/L.
Effluent exceeds 1.0mg/l correct answers Poor release of phosphorus in
fermentation
basi
n
Calculate the SVI for the activated sludge
treatment plant:
certification exam
A common remedy for activated sludge system problems is to increase
the waste sludge flow rate, when would an increase of WAS rate not be
activated
correct? When
answers correctstraggler Floc is present in clarifier and
settleometer
The chlorine residual is falling An inspection of the 150lb cylinder and
chlorine feed
equipment shows ice forming on the chlorine regulator and feed lines. The
best
to fixmethod
the falling chlorine residual is? correct answers Put another
chlorine cylinder
onlin
e
Caution must be used when adding caustic chemical to a
digester.
Lime can combine with carbon dioxide in the digester to form what
problem?A correct
answers dangerous
vacuum
How many gallons will the single piston, reciprocating sludge pump
discharge
minute perpiston bore (diameter) is 6 inches and the stroke length is 11
If the
inches?
pump Theat 99 revolutions per minute. correct answers
runs
134gpm
solve MCRT:
Flow:
3.6mgd
Basin volume:
5.0mg
MLSS:2350mg
/l
WAS
ss:4800mg/l
WAS flow:
Eff tss: 15mg/l correct answers 15
150000gpd
days
There are high suspended solids in the water applied to the filters due to
bulking
in sludge
the secondary
clarifiers.
Polymer is used as a filter aid chemical, but the effluent ability is
worsening.
What is the best method to correct the filter problem? correct answers Run
jar tests to best Polymer
determine
dosage
An advantage of a continuous backwash, up flow, deep bed sand filters
is? correct
answers Filters do not need to be taken out of service for
backwashing
The aeration tank dissolved oxygen has been running normal, 1.5 to 2.0
mg/L the whole
mont
h.
Today's D.O. reading has spiked to nearly 6.0 mg/L in the aeration tank and
the clarifier
and plant effluent or
cloudy.
, What is the most likely cause of the rise in D.O.? correct answers A toxic
shock load
cyanide hasofentered the
plant
Plant fecal coliform counts do not meet state
standards.
The chlorine supply is not the problem and there is adequate vacuum and
chlorine
the feedcontacting has no solids build up and the effluent flow is
chlorine
belowisdesign.
What the most likely cause of the poor fecal coliform kill? correct
answers demand
chlorine High from excessive nitrite in
effluent
The point, location or structure where wastewater discharges from a
sewer,conduit
other drain oris called what? correct answers
Outfall
The volatile acid to alkalinity ratio of a properly operating anaerobic
digester is
answers 0.1correct
parts acid to one part alkalinity
(0.1 : 1.0)
What is a disadvantage of running a digester in the thermophilic
temperature
correct answers range?
The higher costs of heating the digester with
natural gas
What condition of a surface water, river or stream will allow more DO
saturation?
correct answers Cold water
temperature
Solids are washing out of the secondary clarifier of the activated
sludgepersonnel
Plant plant. increase the RAS flow rate, which slows the problem
temporarily
then but after 30
it worsens
minutes.
What is the cause of the plant problem? correct answers Increase of
RAS flow the detention time in the
decreased
clarifier
When operating upflow, continuous backwash sand filter that is discharging
poor filtrate.
What should you check? correct answers
reject/washwater valves
When using lime to precipitate phosphorus from treated effluent, it is
importantthe
maintain to pH at or above correct
answers 11.0
Upward force of groundwater on sedimentation
tank?
groundwater depth: 6ft above tank
bottom
Tank width: 80ft
Tank length: 157ft long correct answers
wide
4,700,000lbs
Luxury uptake phosphorus removal method is failing to remove
permitted
Influent levels:
phosphorus is 8
mg/L.
Fermentation basin phosphorus level is 10
mg/L.
Aeration basin phosphorus is 8
mg/L.
Effluent exceeds 1.0mg/l correct answers Poor release of phosphorus in
fermentation
basi
n
Calculate the SVI for the activated sludge
treatment plant:
