Florida Wastewater Operator class B
certification exam Questions With
Complete Solutions Rated A+
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? -
CORRECT ANSWER-When straggler Floc is present in clarifier and settleometer
solve MCRT:
Flow: 3.6mgd
Basin volume: 5.0mg
MLSS:2350mg/l
WAS ss:4800mg/l
WAS flow: 150000gpd
Eff tss: 15mg/l - CORRECT 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? - CORRECT ANSWER-Run jar
tests to determine best Polymer dosage
An advantage of a continuous backwash, up flow, deep bed sand filters is? - CORRECT
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.? - CORRECT 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? - CORRECT ANSWER-
High chlorine demand from excessive nitrite in effluent
The point, location or structure where wastewater discharges from a sewer, drain or
other conduit is called what? - CORRECT ANSWER-Outfall
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? - CORRECT 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? -
CORRECT 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. - CORRECT ANSWER-134gpm
The volatile acid to alkalinity ratio of a properly operating anaerobic digester is -
CORRECT ANSWER-0.1 parts acid to one part alkalinity (0.1 : 1.0)
certification exam Questions With
Complete Solutions Rated A+
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? -
CORRECT ANSWER-When straggler Floc is present in clarifier and settleometer
solve MCRT:
Flow: 3.6mgd
Basin volume: 5.0mg
MLSS:2350mg/l
WAS ss:4800mg/l
WAS flow: 150000gpd
Eff tss: 15mg/l - CORRECT 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? - CORRECT ANSWER-Run jar
tests to determine best Polymer dosage
An advantage of a continuous backwash, up flow, deep bed sand filters is? - CORRECT
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.? - CORRECT 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? - CORRECT ANSWER-
High chlorine demand from excessive nitrite in effluent
The point, location or structure where wastewater discharges from a sewer, drain or
other conduit is called what? - CORRECT ANSWER-Outfall
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? - CORRECT 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? -
CORRECT 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. - CORRECT ANSWER-134gpm
The volatile acid to alkalinity ratio of a properly operating anaerobic digester is -
CORRECT ANSWER-0.1 parts acid to one part alkalinity (0.1 : 1.0)
