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32 Cards in this Set

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