WASTEWATER TEST FINAL TEST 2026
QUESTIONS WITH CORRECT ANSWERS
GRADED A+
◍ The centrifugal pump has how many moving parts?.
Answer: One
◍ What is the typical range for mixed liquor concentration in an activated
sludge plant?.
Answer: 1,000 to 5,000 mg/l
◍ With a chemical absorbent.
Answer: What is the best way to clean up a polymer spill?
◍ Municipal wastewater consists of approximately what percentage of water?.
Answer: 99.9%
◍ The type of pump that is most common in a wastewater treatment facility is
a?.
Answer: Centrifugal
◍ Extended Aeration.
Answer: Considering the layout and flow diagram for the complete
treatment plant, oxidation ditch plants would be most similar to the
following?
◍ 22.5 mg/l.
Answer: The primary effluent to a RBC system is 350 mg/l BOD. The
primary unit removes 83%, the secondary unit removes 50%, and the final
unit removes 25%. What is the BOD leaving the final unit of the RBC train?
◍ The component in the aeration system that breaks up the air bubbles is
known as the?.
, Answer: Diffuser
◍ Flush with cold water for 15 minutes.
Answer: What is First-Aid for someone getting chlorine gas in their eyes?
◍ Watch full cycle.
Answer: What is normal daily maintenance for an automatic bar screen?
◍ What is the typical range for influential BOD5?.
Answer: 100-259mg/l
◍ The packing bolts or nuts on the packing gland are properly adjusted.
Answer: A horizontal centrifugal pump has "rope" packing. When the pump
is in operation, water slowly drips from the packing gland. What does this
indicate?
◍ Light brown, thin, frothy foam.
Answer: What is the appearance of young sludge?
◍ Grab samples taken in sizes that correspond to the flow rate are known as?.
Answer: Flow proportional
◍ Which test measures the solids in and out of the treatment process for plant
efficiency?.
Answer: Total suspended solids test
◍ Complete mix, step aeration, and contact stabilization are modifications of
what process?.
Answer: Activated sludge
◍ Excessive moisture.
Answer: What is one of the most likely causes of electric motor failure?
◍ Nitrification is the conversion of?.
Answer: Ammonia to nitrate
◍ To prevent contamination of potable water systems.
Answer: How is an air-gap device used?
◍ The lower level in a facultative lagoon is?.
, Answer: Anaerobic
◍ magnetic.
Answer: What type of flow meters are used during normal operations of the
sludge removal?
◍ Low solids in the return sludge could be an indication of?.
Answer: Excessive wasting
◍ In the middle, after all return flows have been well mixed.
Answer: When collecting a sludge sample, where is the most representative
sample location?
◍ Water pressure.
Answer: What factors control the throat size in a chlorinator?
◍ One horsepower is equal to lifting?.
Answer: 33,000 pounds one foot in one minute
◍ The 30-minute settling data, when combined with the mixed liquor
suspended solids data, can be used to calculate the parameter called?.
Answer: Sludge volume index test
◍ 225.
Answer: Calculate SVIGIVEN: 30 minute settling test = 1800ml in a
2000ml containerMLSS: 4000mg/L
◍ Biological slime composed of soluble BOD and ammonia.
Answer: What coats granular filter media with a biological slime used to
filter wastewater?
◍ To protect chemicals that are sensitive to light.
Answer: What is the purpose of amber storage bottles?
◍ Portable DO probe/ meter.
Answer: What type of equipment should be calibrated daily at the plant?
◍ sulfur dioxide.
Answer: What chemical is used for de-chlorination?
QUESTIONS WITH CORRECT ANSWERS
GRADED A+
◍ The centrifugal pump has how many moving parts?.
Answer: One
◍ What is the typical range for mixed liquor concentration in an activated
sludge plant?.
Answer: 1,000 to 5,000 mg/l
◍ With a chemical absorbent.
Answer: What is the best way to clean up a polymer spill?
◍ Municipal wastewater consists of approximately what percentage of water?.
Answer: 99.9%
◍ The type of pump that is most common in a wastewater treatment facility is
a?.
Answer: Centrifugal
◍ Extended Aeration.
Answer: Considering the layout and flow diagram for the complete
treatment plant, oxidation ditch plants would be most similar to the
following?
◍ 22.5 mg/l.
Answer: The primary effluent to a RBC system is 350 mg/l BOD. The
primary unit removes 83%, the secondary unit removes 50%, and the final
unit removes 25%. What is the BOD leaving the final unit of the RBC train?
◍ The component in the aeration system that breaks up the air bubbles is
known as the?.
, Answer: Diffuser
◍ Flush with cold water for 15 minutes.
Answer: What is First-Aid for someone getting chlorine gas in their eyes?
◍ Watch full cycle.
Answer: What is normal daily maintenance for an automatic bar screen?
◍ What is the typical range for influential BOD5?.
Answer: 100-259mg/l
◍ The packing bolts or nuts on the packing gland are properly adjusted.
Answer: A horizontal centrifugal pump has "rope" packing. When the pump
is in operation, water slowly drips from the packing gland. What does this
indicate?
◍ Light brown, thin, frothy foam.
Answer: What is the appearance of young sludge?
◍ Grab samples taken in sizes that correspond to the flow rate are known as?.
Answer: Flow proportional
◍ Which test measures the solids in and out of the treatment process for plant
efficiency?.
Answer: Total suspended solids test
◍ Complete mix, step aeration, and contact stabilization are modifications of
what process?.
Answer: Activated sludge
◍ Excessive moisture.
Answer: What is one of the most likely causes of electric motor failure?
◍ Nitrification is the conversion of?.
Answer: Ammonia to nitrate
◍ To prevent contamination of potable water systems.
Answer: How is an air-gap device used?
◍ The lower level in a facultative lagoon is?.
, Answer: Anaerobic
◍ magnetic.
Answer: What type of flow meters are used during normal operations of the
sludge removal?
◍ Low solids in the return sludge could be an indication of?.
Answer: Excessive wasting
◍ In the middle, after all return flows have been well mixed.
Answer: When collecting a sludge sample, where is the most representative
sample location?
◍ Water pressure.
Answer: What factors control the throat size in a chlorinator?
◍ One horsepower is equal to lifting?.
Answer: 33,000 pounds one foot in one minute
◍ The 30-minute settling data, when combined with the mixed liquor
suspended solids data, can be used to calculate the parameter called?.
Answer: Sludge volume index test
◍ 225.
Answer: Calculate SVIGIVEN: 30 minute settling test = 1800ml in a
2000ml containerMLSS: 4000mg/L
◍ Biological slime composed of soluble BOD and ammonia.
Answer: What coats granular filter media with a biological slime used to
filter wastewater?
◍ To protect chemicals that are sensitive to light.
Answer: What is the purpose of amber storage bottles?
◍ Portable DO probe/ meter.
Answer: What type of equipment should be calibrated daily at the plant?
◍ sulfur dioxide.
Answer: What chemical is used for de-chlorination?
