WASTEWATER TREATMENT CLASS
B TEST EXAM PAPER COMPLETE
QUESTIONS CORRECT ANSWERS
◉ The term pathogenic means. Answer: Capable of causing disease
◉ The minimum separation between sewer lines and potable water
lines is. Answer: 9 feet
◉ A licensed wastewater operator is a professional. Answer:
consistently does best job possible, practices personal safety, strives
to improve job knowledge, strives to keep the plant and collection
system in the best appearance and working order
◉ An important step in testing a sample for Total Suspended Solids
is. Answer: Filtering a sample
◉ The Biochemical oxygen Demand (BOD) of a sample is based on.
Answer: Measuring the dissolved oxygen (DO) used
◉ The results of Biochemical Oxygen Demand (BOD) sample taken
at a treatment plant tells the operator. Answer: How the plant was
operating 5 days ago
,◉ Which of the following are dangerous gasses that are likely to be
present in lift stations and manholes?. Answer: Natural gas, gasoline
fumes, hydrogen sulfide and carbon dioxide
◉ A preferred hydraulic method of cleaning sewer lines is. Answer:
Hydro Jet Cleaner
◉ Ways to reduce bad odors coming from a collection system.
Answer: routinely cleaning slow running or low flow lines, adding
chlorine or hydrogen peroxide to the collection system
◉ Types of pipe that are commonly used in wastewater collection
system. Answer: ductile iron, Poly Vinyl Chloride (PVC)
◉ Before entering a confined space a worker should. Answer: Use
approved monitoring device and check for the presence of
dangerous gasses, ventilate the space with a blower, wear a safety
harness and attach a life line
◉ A properly designed and operated primary sedimentation tank
should remove _____ percent of incoming BOD. Answer: 30-40%
◉ Devices that may be used to determine the level of sewage in a lift
station. Answer: air bubbler, floats, electrodes, Acoustic (sonic)
, ◉ What is the most important role of aerobic bacteria in the
treatment of wastewater?. Answer: decompose organic matter
◉ The hydraulic loading of a trickling filter may be determined by.
Answer: flow rate and filter area
◉ These can be used to dewater sludge. Answer: belt press, drying
beds, solid bowl centrifuge, gravity thickener
◉ Most important to providing adequate sewage treatment in a
stabilization pond. Answer: sunlight, algae, bacteria and time
◉ Offensive and objectionable odors which sometimes occur in
trickling filters usually indicate. Answer: septic conditions are
present
◉ Dissolved Oxygen (DO) in aeration tank of an activated sludge
plant should be maintained at or about. Answer: 2 to 4 mg/L
◉ Contributes to the infiltration in a collection system. Answer:
breaks in the main lines, high ground water levels, heavy rains,
hydro jet cleaning plugged mains
B TEST EXAM PAPER COMPLETE
QUESTIONS CORRECT ANSWERS
◉ The term pathogenic means. Answer: Capable of causing disease
◉ The minimum separation between sewer lines and potable water
lines is. Answer: 9 feet
◉ A licensed wastewater operator is a professional. Answer:
consistently does best job possible, practices personal safety, strives
to improve job knowledge, strives to keep the plant and collection
system in the best appearance and working order
◉ An important step in testing a sample for Total Suspended Solids
is. Answer: Filtering a sample
◉ The Biochemical oxygen Demand (BOD) of a sample is based on.
Answer: Measuring the dissolved oxygen (DO) used
◉ The results of Biochemical Oxygen Demand (BOD) sample taken
at a treatment plant tells the operator. Answer: How the plant was
operating 5 days ago
,◉ Which of the following are dangerous gasses that are likely to be
present in lift stations and manholes?. Answer: Natural gas, gasoline
fumes, hydrogen sulfide and carbon dioxide
◉ A preferred hydraulic method of cleaning sewer lines is. Answer:
Hydro Jet Cleaner
◉ Ways to reduce bad odors coming from a collection system.
Answer: routinely cleaning slow running or low flow lines, adding
chlorine or hydrogen peroxide to the collection system
◉ Types of pipe that are commonly used in wastewater collection
system. Answer: ductile iron, Poly Vinyl Chloride (PVC)
◉ Before entering a confined space a worker should. Answer: Use
approved monitoring device and check for the presence of
dangerous gasses, ventilate the space with a blower, wear a safety
harness and attach a life line
◉ A properly designed and operated primary sedimentation tank
should remove _____ percent of incoming BOD. Answer: 30-40%
◉ Devices that may be used to determine the level of sewage in a lift
station. Answer: air bubbler, floats, electrodes, Acoustic (sonic)
, ◉ What is the most important role of aerobic bacteria in the
treatment of wastewater?. Answer: decompose organic matter
◉ The hydraulic loading of a trickling filter may be determined by.
Answer: flow rate and filter area
◉ These can be used to dewater sludge. Answer: belt press, drying
beds, solid bowl centrifuge, gravity thickener
◉ Most important to providing adequate sewage treatment in a
stabilization pond. Answer: sunlight, algae, bacteria and time
◉ Offensive and objectionable odors which sometimes occur in
trickling filters usually indicate. Answer: septic conditions are
present
◉ Dissolved Oxygen (DO) in aeration tank of an activated sludge
plant should be maintained at or about. Answer: 2 to 4 mg/L
◉ Contributes to the infiltration in a collection system. Answer:
breaks in the main lines, high ground water levels, heavy rains,
hydro jet cleaning plugged mains
