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32 Cards in this Set
- Front
- Back
What is control?
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process of monitoring and adjusting organizationsl activities toward a goal
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A new centrifugal pump on initial start up vibrates and shakes real bad: what is the problem?
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Pump and motor not alligned properly
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Pumps 2000gpm with 25ft of head and 85% eff. Pumps run 3mths with 31 days in each month and 12hrs a day at a cost of .05 killowats/hr. What does it cost to run pump?
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hp = 2000 x 25 / 3960 x 85
= .746 x hp x 12hrs/day x 93 days x $.05 = $41.63 |
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Flights not moving on conveyors of primary tanks, what do you do?
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a. back up flights and see if what ever is holding will free itself
b. drain down tank to see what problem is |
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Flights working, flow same, bubbling along outside?
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sludge building up along outside walls
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What is discharged from a large dry cleaning joing?
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Naptha
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Pressure over small rollers on a belt filter should be what, compared to pressure on a big rollers?
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greater pressure
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Slaughter house has daily flow of 5MGD who shuold regulate?
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Local Government
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Metals to check for in sludge before land applying are what?
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cadmium
lead murcury |
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Plating process is to remove?
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Metals
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What would you do if you had a white foam on your aerator?
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decrease waste
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Trickling filter has everything working properly but you have a hydrogen sulfide smell, what do you do to cure?
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increase recirculation rate, check influent, check ventilation, use masking agents
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Why shouldnt you close valves on both ends of sludge line?
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build up gases and fumes could blow up pipe or valve
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What are the type of protozoa in an aerator?
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stalked ciliates, free swimming cillates, flagellated and rotifiers
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You have white billowy foam on an anaerobic digester, what is the problem and how do you fix it?
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reduce feeding rate and stop withdrawing supernatant
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How can you check if mechanical valves are opening correctly with panel settings?
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check indicator arm against the valve opening
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Normally 5 chlorine tanks last 10 days, but after 8 days a lot more chlorine has been used. What is the problem?
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evaporator line is icing up
gasket on connecting valve not tight |
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How would you decrease the F:M ratio in an aeration basin .3 to .25.
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Increase the return activated sludge rate
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You have a basic solution in your wastwater. What would you add to make it neutral?
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Sulfuric Acid
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What would you add to lower pH of wastwater?
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Sulfuric Acid
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If you have wastewater and fresh water connections together, what do you use to prevent mixing?
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air gap back-flow prevention device
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How soon do you test for DO on a grab sample?
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immediately
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Permit requirements for a recieving stream are what?
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Amount of flow in stream and classification of stream
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Where does the lantern ring go on the packing?
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should go on top of the packing
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When doing a 5 day BOD the incubator malfunctions and the sample temperature rises 5 degrees. What does this do to sample?
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BOD increases and DO decreases
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What is the problem in an anaerobic digester when the flame goes real low and the digestion rate decreases?
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Low gas pressure
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Which of the following causes the greatest friction loss in a pipe?
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Increasing velocity of flow
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What do you do to improve settling performance of primacry clarifier basins being operated above their design flow?
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Install flow equalization basins ahead of primary tanks
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To check detention time in a plant what can you do?
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Put dye in influent and time how long it takes to flow through the plant
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What do you do if you have and excessive amount of foaming in anaerobic digester?
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breaking down volatile acids to quickly
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To rise pH in anaerobic digester what do you add?
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sodium bicarbonate
or anhydrous amonia |
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What could cause cavitation in a centrifugal pump?
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pumping to many abrasive materials
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