Waste Water Operator Lv 1 Exam Prep
Questions and Answers | Latest
Version | 2025/2026 | Correct & Verified
What is the first step in a typical wastewater treatment process?
✔✔A. Screening
B. Chlorination
C. Filtration
D. Sludge digestion
What is the primary purpose of bar screens in a treatment plant?
✔✔A. Remove large debris
B. Add oxygen
C. Kill bacteria
D. Reduce nitrogen
Which measurement indicates the amount of oxygen required by microorganisms to stabilize
organic matter?
A. TSS
1
,✔✔B. BOD
C. pH
D. Alkalinity
Which device is used to measure the flow of wastewater in a channel?
✔✔A. Flow meter
B. DO probe
C. Turbidimeter
D. Manometer
What does TSS stand for in wastewater testing?
A. Total Solids Standard
✔✔B. Total Suspended Solids
C. Total Solution Substances
D. Total Surface Solids
What is the main function of grit chambers?
✔✔A. Remove heavy inorganic materials
2
,B. Kill pathogens
C. Neutralize acids
D. Increase dissolved oxygen
Which step in treatment removes settleable solids?
A. Bar screen
✔✔B. Primary clarifier
C. Chlorination basin
D. Aeration tank
What is the primary purpose of secondary treatment?
A. Remove grit
✔✔B. Biologically degrade organic matter
C. Disinfect effluent
D. Remove metals
Which gas is produced during anaerobic digestion?
A. Oxygen
3
, ✔✔B. Methane
C. Nitrogen
D. Ozone
What is the function of an aeration tank?
A. Disinfect water
✔✔B. Provide oxygen for microorganisms
C. Remove grit
D. Neutralize pH
What type of bacteria thrive in an aeration tank?
✔✔A. Aerobic bacteria
B. Anaerobic bacteria
C. Sulfate-reducing bacteria
D. Photosynthetic bacteria
What does FOG stand for in wastewater treatment?
✔✔A. Fats, Oils, and Grease
4
Questions and Answers | Latest
Version | 2025/2026 | Correct & Verified
What is the first step in a typical wastewater treatment process?
✔✔A. Screening
B. Chlorination
C. Filtration
D. Sludge digestion
What is the primary purpose of bar screens in a treatment plant?
✔✔A. Remove large debris
B. Add oxygen
C. Kill bacteria
D. Reduce nitrogen
Which measurement indicates the amount of oxygen required by microorganisms to stabilize
organic matter?
A. TSS
1
,✔✔B. BOD
C. pH
D. Alkalinity
Which device is used to measure the flow of wastewater in a channel?
✔✔A. Flow meter
B. DO probe
C. Turbidimeter
D. Manometer
What does TSS stand for in wastewater testing?
A. Total Solids Standard
✔✔B. Total Suspended Solids
C. Total Solution Substances
D. Total Surface Solids
What is the main function of grit chambers?
✔✔A. Remove heavy inorganic materials
2
,B. Kill pathogens
C. Neutralize acids
D. Increase dissolved oxygen
Which step in treatment removes settleable solids?
A. Bar screen
✔✔B. Primary clarifier
C. Chlorination basin
D. Aeration tank
What is the primary purpose of secondary treatment?
A. Remove grit
✔✔B. Biologically degrade organic matter
C. Disinfect effluent
D. Remove metals
Which gas is produced during anaerobic digestion?
A. Oxygen
3
, ✔✔B. Methane
C. Nitrogen
D. Ozone
What is the function of an aeration tank?
A. Disinfect water
✔✔B. Provide oxygen for microorganisms
C. Remove grit
D. Neutralize pH
What type of bacteria thrive in an aeration tank?
✔✔A. Aerobic bacteria
B. Anaerobic bacteria
C. Sulfate-reducing bacteria
D. Photosynthetic bacteria
What does FOG stand for in wastewater treatment?
✔✔A. Fats, Oils, and Grease
4
