Wastewater Class B Texas questions with
correct answers
The name of the State Agency responsible for enforcing pollution control laws in Texas -
ANSWER-Texas Commission of Environmental Quality
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
When a centrifuge pump loses prime the - ANSWER-pump is no longer moving liquid
A Rotating Biological Contactor (RBC) is - ANSWER-fixed firm biological treatment process
Needs to be checked regularly to properly operate an activated sludge treatment plant -
ANSWER-aeration equipment and mixed liquor solids
Point source discharges are - ANSWER-discharges that come from pipes or ditches that are
monitored, controlled and inspected
Non-point discharges are - ANSWER-discharges that have intermittent, dispersed flows having
little or no control
The Texas Water Code establishes the protection of water quality and quantity of the state by -
ANSWER-setting stream standards, issues permits for discharges, identifies non-point source
controls, and establishes water reuse.
The wastewater plant operator is primarily responsible for - ANSWER-treating wastewater
discharged into the community
correct answers
The name of the State Agency responsible for enforcing pollution control laws in Texas -
ANSWER-Texas Commission of Environmental Quality
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
When a centrifuge pump loses prime the - ANSWER-pump is no longer moving liquid
A Rotating Biological Contactor (RBC) is - ANSWER-fixed firm biological treatment process
Needs to be checked regularly to properly operate an activated sludge treatment plant -
ANSWER-aeration equipment and mixed liquor solids
Point source discharges are - ANSWER-discharges that come from pipes or ditches that are
monitored, controlled and inspected
Non-point discharges are - ANSWER-discharges that have intermittent, dispersed flows having
little or no control
The Texas Water Code establishes the protection of water quality and quantity of the state by -
ANSWER-setting stream standards, issues permits for discharges, identifies non-point source
controls, and establishes water reuse.
The wastewater plant operator is primarily responsible for - ANSWER-treating wastewater
discharged into the community
