WASTEWATER GRADE FOUR EXAM
REVIEW GUIDE 2026 COMPLETE
PRACTICE QUESTIONS AND ANSWERS
●● A scada system is capable of monitoring and controlling equipment
from where?. Answer: remote location
●● A Discharge Monitoring Report is typically submitted to the
regulatory agency on daily basis. Answer: False = Monthly
●● A mechanical seal is used to prevent leaks between where?. Answer:
between the pump casing and shaft
●● Alkalinity is the capacity of a liquid to neutralize base. Answer: False
= Alkalinity neutralizes acids
●● Typical mixed liquor suspended solids concentration is?. Answer:
1,000 to 4,500 mg/l
●● Turbidity is caused by.... Answer: suspended matters
, ●● Algae is not essential to the successful operation of both aerobic and
facultative ponds. Answer: False = Algae supply most of the oxygen to
the supernattant
●● The addition of acid and CO2 will do what to wastewater?. Answer:
lower the pH of wastewater
●● Hydrogen sulfide will deteriorate what kind of structures?. Answer:
concrete structures
●● The higher the pH, the better the disinfection. Answer: False =
●● Maintain a dissolved oxygen concentration of 12 to 14 mg/l in the
aeration tank. Answer: F
●● What happens when the velocity of the wastewater in a clarifier is
greater in some sections than others?. Answer: short circuiting
●● The F/M ratio will decrease when the microorganism
population____________in the aeration tank?. Answer: increases
●● Algae growth will be faster when there is less sunlight. Answer: F
REVIEW GUIDE 2026 COMPLETE
PRACTICE QUESTIONS AND ANSWERS
●● A scada system is capable of monitoring and controlling equipment
from where?. Answer: remote location
●● A Discharge Monitoring Report is typically submitted to the
regulatory agency on daily basis. Answer: False = Monthly
●● A mechanical seal is used to prevent leaks between where?. Answer:
between the pump casing and shaft
●● Alkalinity is the capacity of a liquid to neutralize base. Answer: False
= Alkalinity neutralizes acids
●● Typical mixed liquor suspended solids concentration is?. Answer:
1,000 to 4,500 mg/l
●● Turbidity is caused by.... Answer: suspended matters
, ●● Algae is not essential to the successful operation of both aerobic and
facultative ponds. Answer: False = Algae supply most of the oxygen to
the supernattant
●● The addition of acid and CO2 will do what to wastewater?. Answer:
lower the pH of wastewater
●● Hydrogen sulfide will deteriorate what kind of structures?. Answer:
concrete structures
●● The higher the pH, the better the disinfection. Answer: False =
●● Maintain a dissolved oxygen concentration of 12 to 14 mg/l in the
aeration tank. Answer: F
●● What happens when the velocity of the wastewater in a clarifier is
greater in some sections than others?. Answer: short circuiting
●● The F/M ratio will decrease when the microorganism
population____________in the aeration tank?. Answer: increases
●● Algae growth will be faster when there is less sunlight. Answer: F
