Wastewater Class B Texas EXAM 2025
QUESTIONS AND ANSWERS 100%
VERIFIED ANSWERS GRADED A+
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.
QUESTIONS AND ANSWERS 100%
VERIFIED ANSWERS GRADED A+
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.
