Wastewater Treatment Operator Certification Test #2
2023/2024 Quiz
,Wastewater Treatment Operator Certification Test #2
2023/2024Quiz
What is the typical BOD removal efficiency in a primary clarifier?
A) 10 to 15%
B) 40 to 60%
C) 20 to 50%
D) 95 to 99% correct answerC) 20 to 50% (v.1 pg 129)
What does the "F" in F/M ratio represent?
A) The microorganism population in the aeration tank
B) The amount of filamentous bacteria in the activated sludge process
C) The MLVSS in the aeration tank
D) The food for the microorganisms flowing into the aeration tank, in lbs/day correct answerD) The food
for the microorganisms flowing into the aeration tank, in lbs/day (v.2 pg 58)
Which of the following describes the appearance of healthy activated sludge?
A) Thick, greasy, dark tan foam
B) Brown with a moderate amount of crisp, white foam
C) Clear liquid with clear foam
D) Gray liquid with no foam correct answerB) Brown with a moderate amount of crisp, white foam
What is used to control filamentous organisms?
A) Polymer
B) Sulfur Dioxide
, Wastewater Treatment Operator Certification Test #2
2023/2024Quiz
C) Coagulant
D) Chlorine correct answerD) Chlorine (v.1 pg 399)
What are commonly used to control chlorine feed rate for disinfection?
A) BOD and MLVSS
B) pH and temperature
C) Flow and chlorine residual
D) DO and TSS correct answerC) Flow and chlorine residual (v.1 pg 356)
Which toxic gas is commonly found in septic wastewater and smells like rotten eggs?
A) Hydrogen Sulfide
B) Carbon monoxide
C) Hydrogen
D) Carbon Dioxide correct answerA) Hydrogen Sulfide (v.2 pg 299)
What is the permissible exposure limit for chlorine gas vapor during a normal 8 hour workday and a 40
hour work week?
A) 0.1 ppm
B) 0.5 ppm
C) 1 ppm
D) 15 ppm correct answerB) 0.5 ppm (v.2 pg 268)
What is a vulnerability assessment?
A) Assesses the impact of hydrogen sulfide to a concrete structure
2023/2024 Quiz
,Wastewater Treatment Operator Certification Test #2
2023/2024Quiz
What is the typical BOD removal efficiency in a primary clarifier?
A) 10 to 15%
B) 40 to 60%
C) 20 to 50%
D) 95 to 99% correct answerC) 20 to 50% (v.1 pg 129)
What does the "F" in F/M ratio represent?
A) The microorganism population in the aeration tank
B) The amount of filamentous bacteria in the activated sludge process
C) The MLVSS in the aeration tank
D) The food for the microorganisms flowing into the aeration tank, in lbs/day correct answerD) The food
for the microorganisms flowing into the aeration tank, in lbs/day (v.2 pg 58)
Which of the following describes the appearance of healthy activated sludge?
A) Thick, greasy, dark tan foam
B) Brown with a moderate amount of crisp, white foam
C) Clear liquid with clear foam
D) Gray liquid with no foam correct answerB) Brown with a moderate amount of crisp, white foam
What is used to control filamentous organisms?
A) Polymer
B) Sulfur Dioxide
, Wastewater Treatment Operator Certification Test #2
2023/2024Quiz
C) Coagulant
D) Chlorine correct answerD) Chlorine (v.1 pg 399)
What are commonly used to control chlorine feed rate for disinfection?
A) BOD and MLVSS
B) pH and temperature
C) Flow and chlorine residual
D) DO and TSS correct answerC) Flow and chlorine residual (v.1 pg 356)
Which toxic gas is commonly found in septic wastewater and smells like rotten eggs?
A) Hydrogen Sulfide
B) Carbon monoxide
C) Hydrogen
D) Carbon Dioxide correct answerA) Hydrogen Sulfide (v.2 pg 299)
What is the permissible exposure limit for chlorine gas vapor during a normal 8 hour workday and a 40
hour work week?
A) 0.1 ppm
B) 0.5 ppm
C) 1 ppm
D) 15 ppm correct answerB) 0.5 ppm (v.2 pg 268)
What is a vulnerability assessment?
A) Assesses the impact of hydrogen sulfide to a concrete structure
