©EVERLY 2025 ALL RIGHTS RESERVED
Wastewater Operator Exam Questions And
Answers 100% Pass
How is sludge determined? - ANS MCRT
What is a sludge blanket? - ANS layer of solids on the bottom of the clarifier
How much oxygen depletion is needed for a valid BOD test? - ANS 2 mg/L
The highest removal efficiencies in an RBC will occur in? - ANS Warm weather
What are the predominant organisms indicative of old sludge? - ANS Rotifers and nematodes
For security purposes where should a POTW/WRRF be built? - ANS Hidden from view
What measurement is used to determine UV effectiveness? - ANS UV intensity
What is the hydraulic loading for a trickling filter system that has a diameter of 60 ft and
influent flow of 0.25 mgd? - ANS 88.5 gpd/ft squared
Which piece of equipment is not used for suspended solids testing - ANS triple beam balance
, ©EVERLY 2025 ALL RIGHTS RESERVED
Which conditions favor the growth of filamentous organism in the activated sludge process? -
ANS Low DO, low F/M
What is the purpose of a SCADA system - ANS Control equipment and collect data points
Which of the following temps on the centigrade scale does a reading of 95 degrees Fahrenheit
closely correspond to? - ANS 35 degrees C
What is the sequence of steps needed for proper operation of a sequencing batch reactor (SBR)
- ANS Fill, react, settle, decant
What time of day are DO levels the lowest in a facultative lagoon - ANS Night
What is the primary function if the center ring in a clarifier - ANS dissipate velocity
A wet well is 5ft in diameter and has 12 ft of water. A pump with a speed of 55 gpm turns off at
6ft. About how long will it take to pump the well down from 12ft to 6ft? - ANS 15 minuets
Reviewing all aspects of the wastewater treatment system to determine what would occur
during various types of emergency situations in known as a - ANS Vulnerability assessment
What volume of glucose-glutamic acid is required when directly adding to a standard 300 mL
BOD dilution bottle? - ANS 6.0 mL
What is the penalty for falsifying lab data - ANS Felony
For a trickling filter, organic loading is typically expressed as - ANS lb BOD5/d/1000ft3
Wastewater Operator Exam Questions And
Answers 100% Pass
How is sludge determined? - ANS MCRT
What is a sludge blanket? - ANS layer of solids on the bottom of the clarifier
How much oxygen depletion is needed for a valid BOD test? - ANS 2 mg/L
The highest removal efficiencies in an RBC will occur in? - ANS Warm weather
What are the predominant organisms indicative of old sludge? - ANS Rotifers and nematodes
For security purposes where should a POTW/WRRF be built? - ANS Hidden from view
What measurement is used to determine UV effectiveness? - ANS UV intensity
What is the hydraulic loading for a trickling filter system that has a diameter of 60 ft and
influent flow of 0.25 mgd? - ANS 88.5 gpd/ft squared
Which piece of equipment is not used for suspended solids testing - ANS triple beam balance
, ©EVERLY 2025 ALL RIGHTS RESERVED
Which conditions favor the growth of filamentous organism in the activated sludge process? -
ANS Low DO, low F/M
What is the purpose of a SCADA system - ANS Control equipment and collect data points
Which of the following temps on the centigrade scale does a reading of 95 degrees Fahrenheit
closely correspond to? - ANS 35 degrees C
What is the sequence of steps needed for proper operation of a sequencing batch reactor (SBR)
- ANS Fill, react, settle, decant
What time of day are DO levels the lowest in a facultative lagoon - ANS Night
What is the primary function if the center ring in a clarifier - ANS dissipate velocity
A wet well is 5ft in diameter and has 12 ft of water. A pump with a speed of 55 gpm turns off at
6ft. About how long will it take to pump the well down from 12ft to 6ft? - ANS 15 minuets
Reviewing all aspects of the wastewater treatment system to determine what would occur
during various types of emergency situations in known as a - ANS Vulnerability assessment
What volume of glucose-glutamic acid is required when directly adding to a standard 300 mL
BOD dilution bottle? - ANS 6.0 mL
What is the penalty for falsifying lab data - ANS Felony
For a trickling filter, organic loading is typically expressed as - ANS lb BOD5/d/1000ft3
