Florida Wastewater Operator class B
certification exam Correct 100%
A common remedy for activated sludge system problems is to increase the waste
activated sludge flow rate, when would an increase of WAS rate not be correct? -
ANSWER When straggler 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 method
to fix the falling chlorine residual is? - ANSWER Put another chlorine cylinder online
Caution must be used when adding caustic chemical to a digester.
Lime can combine with carbon dioxide in the digester to form what problem? -
ANSWER A dangerous vacuum
How many gallons will the single piston, reciprocating sludge pump discharge per
minute If the piston bore (diameter) is 6 inches and the stroke length is 11 inches? The
pump runs at 99 revolutions per minute. - ANSWER 134gpm
solve MCRT:
Flow: 3.6mgd
Basin volume: 5.0mg
MLSS:2350mg/l
WAS ss:4800mg/l
WAS flow: 150000gpd
Eff tss: 15mg/l - ANSWER 15 days
There are high suspended solids in the water applied to the filters due to bulking sludge
in 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? - ANSWER Run jar tests to
determine best Polymer dosage
An advantage of a continuous backwash, up flow, deep bed sand filters is? - ANSWER
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
month.
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.? - ANSWER A toxic shock load of
cyanide has entered 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 feed
the chlorine contacting has no solids build up and the effluent flow is below design.
What is the most likely cause of the poor fecal coliform kill? - ANSWER High chlorine
demand from excessive nitrite in effluent
In the luxury uptake method of phosphorus removal organisms release phosphorus
during which phase of treatment? - ANSWER Anaerobic phase
Plant effluent coliform count fails to meet required standards for disinfection. chlorine
residual is normal. Disinfection supplies are not a problem.
What is the most probable cause? - ANSWER Contact time too short
Using the breakpoint chlorination method of ammonia removal, approximately how
many parts of chlorine are needed to remove one part of ammonia? - ANSWER 10
parts
Waste activated sludge is pumped into the aerobic digester at 77% volatile solids. after
one week of digestion sludge is applied to the drying beds at 70% volatile solids. What
is the percent volatile solids reduction? - ANSWER 30%
Brake Horsepower (BHP)
Head: 1450ft
Pump eff: 91%
Flowrate needed: 5000gpm
Impeller dia: 11.5"
Discharge pipe dia: 12" - ANSWER 2000 bhp
Gallons applied to sprayfield:
Zone: 7 acres
Effluent applied: 4.5" - ANSWER 855,300gals
When nitrification occurs in an aeration tank, the expected conditions at the end of the
aerated zone would be: - ANSWER Increase in nitrate and nitrate decrease in alkalinity
and pH
Formation of material that is approximately round in shape from pea size to more than 2
inches in diameter and forms and filter media from insufficient backwashing are called?
- ANSWER Mud balls
Measuring the water, pressure above and below filter, media is a way of determining? -
ANSWER Head loss
The preservative used for transport of the fecal coliform sample is: - ANSWER Ice to
4°C
certification exam Correct 100%
A common remedy for activated sludge system problems is to increase the waste
activated sludge flow rate, when would an increase of WAS rate not be correct? -
ANSWER When straggler 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 method
to fix the falling chlorine residual is? - ANSWER Put another chlorine cylinder online
Caution must be used when adding caustic chemical to a digester.
Lime can combine with carbon dioxide in the digester to form what problem? -
ANSWER A dangerous vacuum
How many gallons will the single piston, reciprocating sludge pump discharge per
minute If the piston bore (diameter) is 6 inches and the stroke length is 11 inches? The
pump runs at 99 revolutions per minute. - ANSWER 134gpm
solve MCRT:
Flow: 3.6mgd
Basin volume: 5.0mg
MLSS:2350mg/l
WAS ss:4800mg/l
WAS flow: 150000gpd
Eff tss: 15mg/l - ANSWER 15 days
There are high suspended solids in the water applied to the filters due to bulking sludge
in 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? - ANSWER Run jar tests to
determine best Polymer dosage
An advantage of a continuous backwash, up flow, deep bed sand filters is? - ANSWER
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
month.
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.? - ANSWER A toxic shock load of
cyanide has entered 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 feed
the chlorine contacting has no solids build up and the effluent flow is below design.
What is the most likely cause of the poor fecal coliform kill? - ANSWER High chlorine
demand from excessive nitrite in effluent
In the luxury uptake method of phosphorus removal organisms release phosphorus
during which phase of treatment? - ANSWER Anaerobic phase
Plant effluent coliform count fails to meet required standards for disinfection. chlorine
residual is normal. Disinfection supplies are not a problem.
What is the most probable cause? - ANSWER Contact time too short
Using the breakpoint chlorination method of ammonia removal, approximately how
many parts of chlorine are needed to remove one part of ammonia? - ANSWER 10
parts
Waste activated sludge is pumped into the aerobic digester at 77% volatile solids. after
one week of digestion sludge is applied to the drying beds at 70% volatile solids. What
is the percent volatile solids reduction? - ANSWER 30%
Brake Horsepower (BHP)
Head: 1450ft
Pump eff: 91%
Flowrate needed: 5000gpm
Impeller dia: 11.5"
Discharge pipe dia: 12" - ANSWER 2000 bhp
Gallons applied to sprayfield:
Zone: 7 acres
Effluent applied: 4.5" - ANSWER 855,300gals
When nitrification occurs in an aeration tank, the expected conditions at the end of the
aerated zone would be: - ANSWER Increase in nitrate and nitrate decrease in alkalinity
and pH
Formation of material that is approximately round in shape from pea size to more than 2
inches in diameter and forms and filter media from insufficient backwashing are called?
- ANSWER Mud balls
Measuring the water, pressure above and below filter, media is a way of determining? -
ANSWER Head loss
The preservative used for transport of the fecal coliform sample is: - ANSWER Ice to
4°C
