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Basic Wastewater Operator Practice Exam Questions and answers | Updated 2024/25 RATED A+
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Basic Wastewater Operator Practice Exam Questions and answers | Updated 2024/25 RATED A+
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Basic Wastewater Operator PracticeExam Questions and answers | Updated
2024/25 RATED A+
What is the predominant organism in a healthy activated sludge treatment plant?
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A. Stalked ciliates
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B. rotifers II
C. nematodes II
D. amoebas - A. Stalked Ciliates
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II A composite sample must be?
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A. sporadically collected in the treatment plant
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B. taken at one time
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C. analyzed immediately
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D. representative and sub-samples time spaced over 15 minutes apart - D.
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representative and sub-samples time spaced over 15 minutes apart
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II What is the standard volume for a BOD sample bottle?
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A. 150 mL II II
B. 200 mL II II
C. 300 mL II II
D. 500 mL - c. 300 mL
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II If you have a lime slurry feed line, what is the best valve to use?
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A. plug valve II II
B. butterfly valve
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C. RPZ dual check valve
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D. gate valve - A. plug valve
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5. If you notice a predominance of rotifers in your activated sludge sample while looking at
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it under a microscope, what does this indicate?
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A. healthy sludge
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B. young sludge II II
C. old sludge II II
D. middle age sludge - C. old sludge
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Calculate the BOD using the given information:
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Initial DO: 8.3 II II
,Final DO: 5.9 II II
Milliliters of sample used: 2 II II II II
a. 360 mg/L
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b. 210 mg/L
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c. 856 mg/L
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d. 36 mg/L - a. 360 mg/L
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If your activated sludge plant begins to nitrify, what conditions would you expect to
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decrease?
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A. settling in clarifiers
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B. chlorine demand
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C. BOD effluent
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D. TSS in effluent - a. settling in the clarifiers
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II How do you calibrate a chemical feed pump?
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A. by measuring the pump output
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B. using the SWAG method
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C. jar testII II
D. with a microscope - A. by measuring the pump output
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II What is the chemical formula for sulfuric acid?
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a. HNO3
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b. HClII
c. NaOH
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d. H2SO4 - d. H2SO4
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II What is the most common type of activated sludge package plants?
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a. extended aeration
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b. sequential batch reactor
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c. oxidation ditch
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d. bardenpho - a. extended aeration
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II What is the most appropriate method of reducing the F:M ratio?
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A. increase wasting
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b. decrease wasting
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c. reduce BOD from influent flow
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D. add polymer to RAS to increase settling - b. decrease wasting
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An operator notices a portion of the aeration tank with large bubbles rising up. What is the
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most likely problem?
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, a. equal air distribution
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b. unequal air distribution caused by a blown/clogged diffuser
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c. normal operation
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d. reason to believe the air filter in the blower is clogged - b. unequal air distribution
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caused by a blown diffuser
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II What is suction lift? II II II
a. a team approach to lifting heavy objects
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b. the pressure on the suction side of the pump
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c. the measurement of liquid pressure at the pump
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d. the measure of how bad your workers lift heavy objects - b. the pressure on the suction
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side of the pump
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The primary effluent to a RBC system is 350 mg/L BOD. The primary unit removes 83%
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the secondary unit removes 50% and the final unit removes 25%. What is the BOD
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leaving the final unit of the RBC train?
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A. 290 mg/LII II
b. 60 mg/L
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c. 30 mg/L
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d. 22.5 mg/L - d. 22.5 mg/L
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The influent to the treatment plant is septic. it is determined that it is coming from a lift
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station upstream from the plant. What should the operator do?
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A. decrease the lag time for pump operation by moving the floats closer together
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b. add pH adjuster to the influent flow
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c. install larger capacity pumps in the lift stations
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d. the her nothing you can do to correct this problem - A. decrease the lag time for pump
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operation by moving the floats closer together
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II What is the purpose of amber storage bottles?
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A. the color is pretty
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b. they are cheaper
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c. to protect chemicals that are sensitive to light
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d. so you can not see what is inside the container - c. to protect chemicals that are
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sensitive to light
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Calculate SRT
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Given: MLSS = 2400 mg/L II II II II
Aeration basin volume = 35,000 gallons = 0.0350 MG II II II II II II II II
WAS concentration = 3500 mg/L II II II II
WAS flow rate = 0.001 MGD II II II II II
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