Cool hand Luke
A centrifugal pump running at 100% with restricted flow is registering 40 amps. If the pump is changed to run at 50% and the restriction is removed causing increased flow. What happens to the number of amps?
A. Increase
B. Decrease
C. Stays the same
D. Does not Change
What is (B) decrease
An old, over oxidized sludge at an underloaded plant produces mixed liquor solids that
A. settle slowly but produce a clear effluent
B. Settle rapidly leaving a turbid supernatant.
C. Cannot nitrify but turn septic readily in the final clarifier
D. All the above
E. None of the above.
What is (B) settle rapidly leaving a turbid supernatant
Short circuiting in a final sedimentation process:
A. is probably caused by mechanical failures.
B. usually represents a hydraulic deficiency of design or operation
C. Increases efficiency by facilitating rapid movement of treatment plant effluent
D. has no effect on plant performance.
E. All of the above.
What is (B) usually represents a hydraulic deficiency of design or operation
Using results only from the settle-ability test and MLSS test of activated sludge solids the operator will be able to
A. calculate the F/M ratio
B. Set the doge for chlorinating the return activated sludge
C. Calculate the MCRT
D. Calculate the SVI
What is (D) calculate the SVI
The chlorine room is required to have two air vents. One is a forced air fan at the top where should the vent on the opposite wall be placed?
A. At the top
B. Half way up the wall
C. At the Bottom
What is (C) at the Bottom
The influent BOD is not high but the plant appears to be overloaded. What could be causing the problem?
A. High solids from thickeners to digester
B. High solids in belt press
C. Supernatant from digester to aeration
D. RAS too high
What is (D) RAS too High
After collecting a 30 Min. set, what characteristics of a true bulking sludge would show? (daily double)
A. Settles fast with a cloudy supernatant
B. Settles slowly with only a few milliliters of clear liquid at the top
C. Sludge in bottom 1/3 with clear supernate
D. Settles slowly with fluffy sludge
E. Settles fast with clear supernate and pin floc
What is (B) settles slowly with only a few milliliters of clear liquid at the top
Ponds should be designed to
A. always be 10 feet deep
B. Have an influent pipe with multiple outlets
C. Maintain lots of vegetation on slopes
D. Have trees to provide shade
What is (B) have an influent pipe with multiple outlets.
If a centrifugal pumps 100 gallons using 100 mps with a good impeller, what happens o the amps when a pump has a worn impeller? (daily double)
A. Amps increase
B. Amps decrease
C. Amps stay the same
D. Amps can increase or decrease
What is (A) amps increase
A pump has a worn impeller the energy cost would be
A. More
B. Less
C. The same
What is (A) More
What does it mean when you observe red worms while performing a microscopic examination of the activated sludge?
A. The sludge is very young
B. The SRT is low
C. The sludge is very old
D. The F/M ratio is high
what is (C) sludge is very old
Which operating parameter is not common for a conventional activated sludge process?
What is (D) F/M ratio between 0.1 to 0.15
What is the minimum velocity in a sanitary sewer pipeline necessary to prevent settling of solids and debris?
1. 1 fps
2. 0.5 fps
3. 2 fps
4. 2 fpm
What is (3) 2 fps
What action should be considered to control filter flies?
What is (C) flood the filters
What is the advanced stage of activated sludge called when bacteria oxidize their own cell mass?
A. Log growth
B. Declining growth
C. Cathodic protection
D. Endogenous respiration
What is (D) Endogenous Respiration
What action should be performed to permanently reduce the F/M ratio from 0.4 to 0.3?
What is (1) decrease waste
What is the main difference between a conventional activated sludge process and an advanced wastewater treatment process? (Daily Double)
A. CBOD5 removal
B. TSS removal
C. Nitrogen & phosphorus removal
D. Metals removal
What is nitrogen and phosphorus removal
Which chemical is more commonly used to dechlorinate chlorinated effluent?
A. Sodium hypochlorite
B. Bleach
C. Sulfur dioxide
D. Ferric chloride
what is (C) Sulfur Dioxide
What device is used to turn over gravity sludge and create clean spaces on the belt (of a gravity belt thickener or belt filter press) to promote improved drainage?
? Retention vessel
? Venturi mixer
? Chicane
? Drive unit
What is (Chicane)
Which adjustment will normally improve denitrification in an aeration tank?
? Increase the air supply
? Increase the D.O.
? Decrease the D.O.
? Shut off the RAS
What is (Decrease the DO)
When a chlorine leak is identified, what color will it turn?
? Yellow
? White
? Black
? Green
What is (White)
Which adjustment will create an increased contact time in the aeration tank?
? Lower the weir
? Increase the air supply rate
? Decrease the WAS rate
? Decrease the RAS rate
What is (Decrease the RAS rate)
Which adjustment may best solve the problem of a high ammonia level in the aeration effluent?
? Increase the flow rate
? Decrease the aeration D.O.
? Place another secondary clarifier into service
? Increase the aeration air supply
What is (Increase the aeration air supply)
What type of trickling filter would be more likely to receive 15 million gallons per acres per day? (Daily Double)
? Low rate
? Polishing filter
? Second stage filter
? High rate
What is (High Rate)
What is the primary function of polymer conditioning in the belt filter press process?
? To decrease solids content
? To promote rapid water release in the gravity section
? To sterilize the microorganisms
? To disinfect the sludge particles
What is (To promote rapid water release in the gravity section