NORTH CAROLINA WASTEWATER LAB
ANALYST CLASS 4 EXAM 2026 PRACTICE
QUESTIONS AND ANSWERS
◉ Ponds remove what % of BOD when properly operated Answer:
70-80%
◉ Facultative ponds has _________ detention time. Answer: 50-60 days
◉ If ponds discharge only twice a year, discharge when flow
are__________ and it is nonrecreational season. Answer: high in
receiving waters
◉ __________ provides a greater volatile solids reduction than
anaerobic digestion. Answer: Aerobic
◉ what causes algae growth in receiving water to get out of hand.
Answer: Nitrogen & Phosphorus
◉ what are mechanical aeration in ponds Answer: floating aerators
◉ a serious safety hazard for using polymers. Answer: Very slippery
, ◉ what type of plant is best for shock loads? Answer: Step-feed-
Process
◉ A Modest amount of foam is______________ in aeration basins
Answer: Normal
◉ what type of sewage has the highest ammonia nitrogen? Answer:
stale raw sewage
◉ Dechlorination should happen at what location is wastewater
process? Answer: should be where flow is turbulent and no short
circuiting and typical application point is,just prior to discharge to
receiving stream.
◉ what is used to measure odors? Answer: Olfactometer of odor
panel.
◉ what is ozone prepared on site? Answer: unstable chemical
◉ In Sequencing batch reactor what are the steps? Answer: Fill---
reaction(aeration)----settle---decant---idle.
ANALYST CLASS 4 EXAM 2026 PRACTICE
QUESTIONS AND ANSWERS
◉ Ponds remove what % of BOD when properly operated Answer:
70-80%
◉ Facultative ponds has _________ detention time. Answer: 50-60 days
◉ If ponds discharge only twice a year, discharge when flow
are__________ and it is nonrecreational season. Answer: high in
receiving waters
◉ __________ provides a greater volatile solids reduction than
anaerobic digestion. Answer: Aerobic
◉ what causes algae growth in receiving water to get out of hand.
Answer: Nitrogen & Phosphorus
◉ what are mechanical aeration in ponds Answer: floating aerators
◉ a serious safety hazard for using polymers. Answer: Very slippery
, ◉ what type of plant is best for shock loads? Answer: Step-feed-
Process
◉ A Modest amount of foam is______________ in aeration basins
Answer: Normal
◉ what type of sewage has the highest ammonia nitrogen? Answer:
stale raw sewage
◉ Dechlorination should happen at what location is wastewater
process? Answer: should be where flow is turbulent and no short
circuiting and typical application point is,just prior to discharge to
receiving stream.
◉ what is used to measure odors? Answer: Olfactometer of odor
panel.
◉ what is ozone prepared on site? Answer: unstable chemical
◉ In Sequencing batch reactor what are the steps? Answer: Fill---
reaction(aeration)----settle---decant---idle.
