Morgan a Welsh Surname
What would be most harmful to the population of microorganisms?
A. High toxicity, strong acids, strong bases
B. Warm temperatures, high DO
C. Cold temperatures, low DO
D. Neutral pH
What is (A) high toxicity, strong acids, strong bases
After removing the roof of the chlorinator storage, building during the summer, the Cl2 stop feeding, what is the cause?
A. The CPRV became clogged
B. The tank got hotter than the manifold
C. The external pressure reducer failed
D. The tank is empty
What is (B) the tank got hotter than the manifold
What is Phenolphylein used for in titration
A. Oxidizer
B. Indicator
C. Acid reducer to lower pH
D. Applicator
What is (B) Indicator
The following is NOT an example of a flow measuring device: (Daily Double)
A. Magnetic
B. Parshall Flume
C. Weirs
D. Manometer
E. Venturi
What is (D) Manometer (used to measure and indicate atmospheric pressure)
The Maximum change in the sludge wasting rates to maintain uniform operating conditions should be about
A. 10- 20 % per day
B. 20-40 % per day
C. 40-60 % per day
D. 60-80 % per day
E. 100% per day
What is (A) 10-20% per day
What chemical would be used on a sample to be used for TSS test? (Daily Double)
A. Sodium Thiosulfate
B. DPD
C. Nitriver
D. Nothing
What is (D) Nothing
Cathodic protection is used for what purpose?
A. The prevention of corrosion to metals
B. To avoid electrical shock
C. Increase safety
D. Protect utilities from lawsuits due to unsafe environments
What is (A) the prevention of corrosion to metals
You have shiny dark foam on the surface of the aerator. What is the problem?
A. MCRT too high
B. MCRT too low
C. Sludge age too low
D. WAS too high
What is (A) MCRT too high
A Venturi meter is a reliable device for measuring flows of either treated or untreated water.
True or False
What is (True) to measure the volume of flow rate of a liquid in a pipe.
When operating an activated sludge plant, Which TSS concentration is most important for process control?
A. Primary effluent
B. Aeration tank mixed liquor.
C. Return Sludge
D. Digester.
E. Plant influent
What is (B) aeration tank mixed liquor
What causes the most wear to an impeller?
A. High velocities
B. No water
C. Grit
D. Constant head
what is (C) Grit
What type of ponds are used after a trickling filter, activated sludge, or RBC plant? (Daily Double)
A. Facultative pond
B. Aeration Pond
C. Anaerobic pond
D. Polishing pond
What is (D) polishing pond
When charging a lead-acid type battery for a composite sampler, what dangerous gas could be produced?
A. Hydrogen
B. Oxygen
C. Hydrogen sulfide
D. Cyanide
What is (A) Hydrogen
The Activated Sludge Process:
A. requires preaeration
B. requires Activated Carbon
C. is an aerobic biological process.
D. Usually precedes primary sedimentation.
E. Requires 50% by volume old sludge to work effectively.
What is (C) an aerobic biological process
How many aeration tanks does a contact stabilization plant have?
A. one, like all the others
B. Four: contact, mix, reaeration and stabilization
C. Two if you count the digester as an aeration tank
D. a contact tank and a reaeration tank
E. none of this makes any sense to me.
What is (D) a contact tank and a reaeration tank
If a 220 volt, 3 phase motor is running backwards what should you do?
A. Switch the two leads
B. Return pump for a refund
C. Check the polarity magnets
D. Check static pressure
What is (A) Switch the two leads
If an activated sludge plant becomes upset, what is the most important and least time consuming operation an operator should do to discover the cause?
A. Check the plant data for the previous 3 weeks
B. Run BOD, DO, suspended solids, and pH tests on the system
C. Check collection system
D. Check effluent BOD and Cl2 residual
What is (A) check the plant data for the previous 3 weeks
What is the funnel called that is used along with the vacuum apparatus when doing solids testing?
A. Buchner funnel
B. Filter funnel
C. Micro funnel
D. Straining funnel
What is (A) Buchner Funnel
A complete mix activated sludge plant has a fast settling sludge and high amounts of pin floc leaving the clarifier. One way to correct this problem is to :
A. Increase the RAS Flow
B. Reduce Wasting Rates
C. Increase dissolved oxygen levels.
D. Increase the F/M ratio by wasting more
E. Increase the sludge age by wasting less.
What is (D) increase the F/M ratio by wasting more
Reducing the return sludge flow rate for an activated sludge system which has a good settling sludge will.
A. Decrease the hydraulic detention time in the aeration basin
B. Increase the solids concentration in the aeration basin
C. cause the return sludge concentration to decrease
D. have no effect on process performance.
E. increase the RAS concentration ad the clarifier blanket thickness.
What is (E) increase the RAS concentration ad the clarifier blanket thickness
Short circuiting in a primary clarifier can be prevented by?
A. Scum troughs
B. Vertical mixers
C. Baffles
D. Chain flights
What is (C) Baffles
Detritus is noticed in your grit channel. What is the problem?
A. Velocity too fast with short D/T
B. Velocity too low with long D/T
C. Short circuiting
D. Density currents
What is (B) velocity too low with long D/T
The pH in your plant is decreasing, effluent turbidity is increasing, and the sludge is rising in the clarifier. What is the problem? (Daily Double)
A. Hydraulic overload
B. High F/M
C. Over wasting
D. Denitrification
What is (D) Denitrification
During start up your aeration tank produces excessive amounts of billowing white foam. This can be corrected by:
A. Doing nothing, it will go away in a few hours
B. Increasing the sludge wasting rate
C. Seeding the process with sufficient good quality sludge
D. Spraying water on the foam until it is gone
E. Taking a weeks vacation
What is (C) seeding the process with sufficient good quality sludge
What items would you check if an activated sludge plant becomes upset? (Daily Double)
A. Influent temperature.
B. Monthly average flow rates
C. BOD loadings MLSS sludge settle-ability D.O. and oxygen uptake rate
D. digester operation. E. Chlorinator settings.
What is (C) BOD loading, MLss sludge settle ability, DO, and Oxygen uptake rate
What do total solids consist of? (Daily Double)
A. Dissolved and settleable
B. Floatable and settlable
C. Suspended and dissolved
D. Settlable and nonsettleable
What is (C) Suspended and Dissolved
There is septic wastewater entering your primary clarifier. What is the problem?
A. Aerobic conditions in the collections system
B. Lift station pumps operating on short cycles
C. Anaerobic conditions in the collections systems
D. High flows due to a low MCRT
What is (C) anaerobic conditions in the collections systems
A Parshall Flume is generally used to:
A. Perform the COD test.
B. Perform the suspended solids test.
C. Measure flow.
D. None of these.
What is (C) Measure Flow
Which of the following would you use to increase the degree of nitrification in an activated sludge plant?
A. increase the wast rates
B. increase dissolved oxygen levels and increase the sludge age
C. Remove excess alkalinity from the wastewater
D. Maintain a thicker sludge blanket n the clarifier
E. Inhibit the growth of the nitrifying bacteria with chemicals.
What is (B) Increase dissolved oxygen levels and increase the sludge age
Sludge is observed to accumulate in the final clarifier. This may be caused by :
A. plugged sludge collectors return pumps or waste pumps
B. too high a return rate.
C. excessive solids wasting.
D. hydraulically overloaded clarifier
E. All of the above.
What is (A) plugged sludge collectors, return pumps, or waste pumps