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33 Cards in this Set
- Front
- Back
How many lbs of air are needed to remove 1 lb of nitrogenous matter?
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4.6 lbs
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How many lbs of air are needed to remove 1 lbs of CBOD?
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1.5 lbs
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What should be sludge blanket lvl be in the secondary clarifier?
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1 - 3 feet
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What are the mose common types of air blowers used for aeration?
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centerifugal and Positive Displacement
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The aeration tank has a small area with no turbulence. What is the most likely cause??
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Broken diffusers
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There is excessive trubulence on one section of aeration tank. What is the most liekly cause?
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Broken diffusers
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What detemines the need to change a blower filter?
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Manometer reading or differential pressure
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In which direction should the blower orfice plate face?
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Number should face toward the blower.
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Before starting an air blower, what action does the operator take?
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start oil circulation pump
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The aeration tank is overloaded. What type of sludge would you expect?
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young sludge
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The aeration tank is underloaded, what type of bug population would you expect?
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Rotifers & Nematodes; more bugs then food. (old sludge)
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Rotifers & Nematodes are beginning to dominate. What type of sludge would you expect?
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Older sludge
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Free and stalked cilates are starting to dominate. What type of sludge would you expect?
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Good settling and stable sludge
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What microorganisms are generally found at startup of new aeration system
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Amoeba
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What organism uses it whip like tail to move about?
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Flagellate
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Which protozoa use other protozoa as food?
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Suctoria
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What do you call the long filamentous organism that uses sulfates as food?
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Thiothrix
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Which are the short filamentous organisms that re associated with foaming problems?
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Nocardia
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Which long filamentous organisms use iron for its food source?
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Crenothrix
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What does rotifers use to move about in their environment?
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Cilia (short hairs) and forked tail
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What does an amoeba use to move about its environment?
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Pseudopod
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The rotifers uses its forked tail for that purpose?
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Move about and to anchor itself in one place
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Which organism use short hairs on its body to move about?
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Free swimming ciliates
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Sludge bulking has occurred in secondary clarifier. What microorganisms would you expect to find in large numbers?
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Long filamentous organisms
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To view microorganisms in mixed liquor what microscope maginificaion is used?
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10X and 43X
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What divice is used to hold mixed liquor sample in place in the microscope?
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the stage
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If filamentous bacteria are starting to dominate, what action is needed by the operator?
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Raise the DO and lower WAS
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Voricella are what type of protozoa?
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Stalked Ciliate
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What do ciliates, amoeba, an nematodes have in common?
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All are sludge condition indicator organisms
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What type of counting is done to enumerate long filamentous organisms?
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Filament Indexing
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What kind of slide is used to ID Nocardia?
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stained dried slide
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Conditions favorable to free swimming ciliates are also favorable to what other organisms?
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Bacteria ( Nitrogen and carbonaceous BOD digesting bacteria)
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Which organisms use short hair on their body to move about in the water?
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Free swimming ciliates
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