Exam (elaborations)
Florida Wastewater Operator class B certification exam 2024/25
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Florida Wastewater Operator class B certification exam 2024/25
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Florida Wastewater Operator class Bcertification exam 2024/25
A common remedy for activated sludge system problems is to increase the waste
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activated sludge flow rate, when would an increase of WAS rate not be correct? - When
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straggler Floc is present in clarifier and settleometer
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The chlorine residual is falling An inspection of the 150lb cylinder and chlorine feed
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equipment shows ice forming on the chlorine regulator and feed lines. The best method to
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fix the falling chlorine residual is? - Put another chlorine cylinder online
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Caution must be used when adding caustic chemical to a digester.
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Lime can combine with carbon dioxide in the digester to form what problem? - A
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dangerous vacuum
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How many gallons will the single piston, reciprocating sludge pump discharge per minute
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If the piston bore (diameter) is 6 inches and the stroke length is 11 inches? The pump runs
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at 99 revolutions per minute. - 134gpm
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solve MCRT:
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Flow: 3.6mgd II
Basin volume: 5.0mg II II
MLSS:2350mg/l
WAS ss:4800mg/l II
WAS flow: 150000gpd II II
Eff tss: 15mg/l - 15 days
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There are high suspended solids in the water applied to the filters due to bulking sludge in
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the secondary clarifiers.
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Polymer is used as a filter aid chemical, but the effluent ability is worsening.
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What is the best method to correct the filter problem? - Run jar tests to determine best
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Polymer dosage
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An advantage of a continuous backwash, up flow, deep bed sand filters is? - Filters do
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not need to be taken out of service for backwashing
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The aeration tank dissolved oxygen has been running normal, 1.5 to 2.0 mg/L the whole
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month.
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Today's D.O. reading has spiked to nearly 6.0 mg/L in the aeration tank and the clarifier
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and plant effluent or cloudy.
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What is the most likely cause of the rise in D.O.? - A toxic shock load of cyanide has
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entered the plant
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II IIPlant fecal coliform counts do not meet state standards.
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, The chlorine supply is not the problem and there is adequate vacuum and chlorine feed
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the chlorine contacting has no solids build up and the effluent flow is below design.
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What is the most likely cause of the poor fecal coliform kill? - High chlorine demand from
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excessive nitrite in effluent
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The point, location or structure where wastewater discharges from a sewer, drain or
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other conduit is called what? - Outfall
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The volatile acid to alkalinity ratio of a properly operating anaerobic digester is - 0.1
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parts acid to one part alkalinity (0.1 : 1.0)
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What is a disadvantage of running a digester in the thermophilic temperature range? -
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The higher costs of heating the digester with natural gas
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What condition of a surface water, river or stream will allow more DO saturation? - Cold
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water temperature
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Solids are washing out of the secondary clarifier of the activated sludge plant.
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Plant personnel increase the RAS flow rate, which slows the problem temporarily but then
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it worsens after 30 minutes.
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What is the cause of the plant problem? - Increase of RAS flow decreased the detention
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time in the clarifier
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When operating upflow, continuous backwash sand filter that is discharging poor filtrate.
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What should you check? - reject/washwater valves
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When using lime to precipitate phosphorus from treated effluent, it is important to
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maintain the pH at or above - 11.0
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Upward force of groundwater on sedimentation tank?
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groundwater depth: 6ft above tank bottom II II II II II
Tank width: 80ft wide II II II
Tank length: 157ft long - 4,700,000lbs
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Luxury uptake phosphorus removal method is failing to remove permitted levels:
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Influent phosphorus is 8 mg/L. II II II II
Fermentation basin phosphorus level is 10 mg/L. II II II II II II
Aeration basin phosphorus is 8 mg/L. II II II II II
Effluent exceeds 1.0mg/l - Poor release of phosphorus in fermentation basin
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Calculate the SVI for the activated sludge treatment plant:
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30min sett:675 II
60min sett:420 II
MLSSmg/l:3650
MLVSSmg/l:74% - 185ml/g II II II II
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