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How would you stop foaming in an anaerobic digester?
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Reduce the amount of sludge removed from the digester
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If the F/M ratio is increased to an aeration basin and the operator wants to maintain the same dissolved oxygen level in the aerator what action would the operator take?
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Increase the aeration rate
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If an operator normally loads a digestor with 2,500 lbs/day of solids from a slude with an MLSS concentration of 6,000 mg/L, how many gallons per minute of sludge must be pumped?
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35
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In a new activated sludge plant, billows of white sudsy foam appear on the aeration tank. What process control step should the operator take?
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Decrease WAS
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What effect would a worn impellar have on a centrifugal pump?
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Decrease efficiency
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If an operating three phrase motor is driving a pump and one phrase is lost, what will happen?
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The thermal overloads will stop the motor
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What would be the cause of leaking around the seals and the plunger on a plunger pump?
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Discharge head pressure too high
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As grit accumulates in a grit chamber what happens to the velocity of the wastewater flow and the settleability of the grit?
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Velocity increases and the settleabiltiy decreases
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How would an increase in suspended solids effect the ultraviolet disinfection procress?
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Process effeciency will be decreased
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Slaking is the process of____________?
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Adding quicklime to water
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What type of fire extinguisher would you use for an oil and electrical fire?
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Dry Chemical
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What would cause a vacuum filter to produce a wet cake?
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Drum speed too fast
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What type of solids does an Imhoff cone measure?
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Settleable
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What is the advantage of using a positive displacement pump for feeding chemicals?
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They discharge a consistent volume
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What combination of microorganisms would reflect a well balanced activated sludge?
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Flagellates, ciliates, rotifers
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