WASTEWATER EXAM 2025 WITH 100% ACCURATE
SOLUTIONS
The term pathogenic means - ✅✅✅CORRECT -Capable of causing disease
Question: The minimum separation, between sewer lines, and potable water lines is
A. 8 feet
B. 9 feet
C. 10 feet - ✅✅✅CORRECT -B. 9 feet
An important step, in testing a sample, for Total Suspended Solids is - ✅✅✅CORRECT -Filtering a
sample
Biochemical oxygen Demand, (BOD) test is based on? - ✅✅✅CORRECT -Measuring, the dissolved
oxygen, used
Results, of Biochemical Oxygen Demand, (BOD) sample, taken at a treatment plant, tells the operator -
✅✅✅CORRECT -How the plant, was operating, 5 days ago
Question: Which of the following are dangerous gasses that are likely to be present in lift stations and
manholes - ✅✅✅CORRECT -Natural gas, gasoline fumes, hydrogen sulfide, and carbon dioxide
Question: What is the preferred, hydraulic method of cleaning sewer lines - ✅✅✅CORRECT -
Answers: Hydro Jet Cleaning
Question: what are some Ways, to reduce bad odors, generated in the collection system -
✅✅✅CORRECT -Answer:
Routinely cleaning, slow running, or low flow lines,
adding chlorine, or hydrogen peroxide, to the collection system
,Question: what are some Types of pipe materials commonly found in wastewater collection system -
✅✅✅CORRECT -Answer: ductile iron, Poly Vinyl Chloride, (PVC) vitrified clay pipe, fiberglass
Question: before entering a confined space, a worker should perform, what procedures -
✅✅✅CORRECT -Answer:have an approved monitoring device, and check, for the presence of
dangerous gasses, ventilate, the space with a blower, wear a safety harness, and be attach to a life line
A properly designed, and operated primary sedimentation tank, should remove what percent of
incoming BOD.
A.20% to 30%
B. 25 % to 50%
C. 30% to 40% - ✅✅✅CORRECT -C. 30 to 40%
What Devices, can be used, to determine, the level of sewage, in a lift station - ✅✅✅CORRECT -
Answer: air bubbler, floats, electrodes, Acoustic (sonic), radar
What, is the most important role, of aerobic bacteria, in the treatment, of wastewater? -
✅✅✅CORRECT -decomposition, of organic matter
Question: How is the hydraulic loading, of a trickling filter, determined - ✅✅✅CORRECT -
Answer:flow rate, and filter area
Question: what equipment, or methods, can be used, to dewater sludge - ✅✅✅CORRECT -Answer:
belt press, drying beds, solid bowl, centrifuge, gravity thickener
Question: what are the Most important factors, to providing adequate sewage treatment, in a
stabilization pond - ✅✅✅CORRECT -Answer: sunlight, algae, bacteria and, time
Question: what do Offensive, and objectionable odors, in a trickling filter, usually indicate -
✅✅✅CORRECT -Answer: septic conditions exist
, Question: Dissolved Oxygen, (DO) in a activated sludge, aeration tank, should be maintained in What
range - ✅✅✅CORRECT -Answer: 2, to 4, milligram, per liter
Question:what factors Contribute to infiltration in a collection system - ✅✅✅CORRECT -Answer:
breaks in the main lines, high ground water levels, heavy rains, hydro jet cleaning, of plugged mains
Question: what happen When a centrifugal pump loses prime - ✅✅✅CORRECT -Answer: it is no
longer moving liquid
A Rotating Biological Contactor, or , RBC, is a _______biological treatment process
A. fixed film
B. Surface film
C. suspended growth - ✅✅✅CORRECT -A. fixed film
Question:what Needs to be checked regularly, to properly operate, an activated sludge treatment plant -
✅✅✅CORRECT -Answer: aeration equipment, and mixed liquor solids
Question: what is Point source, discharge - ✅✅✅CORRECT -Answer: a discharge that comes from a
pipe or ditch that is monitored, controlled, and inspected
Question: what is a Non-point discharge - ✅✅✅CORRECT -Answer: a discharge that may have an
intermittent, or dispersed, flow having little, or no control
The Texas Water Code establishes the protection of water quality and quantity of the state by -
✅✅✅CORRECT -setting stream standards, issues permits for discharges, identifies non-point source
controls, and establishes water reuse.
The wastewater plant operator is primarily responsible for - ✅✅✅CORRECT -treating wastewater
discharged into the community
SOLUTIONS
The term pathogenic means - ✅✅✅CORRECT -Capable of causing disease
Question: The minimum separation, between sewer lines, and potable water lines is
A. 8 feet
B. 9 feet
C. 10 feet - ✅✅✅CORRECT -B. 9 feet
An important step, in testing a sample, for Total Suspended Solids is - ✅✅✅CORRECT -Filtering a
sample
Biochemical oxygen Demand, (BOD) test is based on? - ✅✅✅CORRECT -Measuring, the dissolved
oxygen, used
Results, of Biochemical Oxygen Demand, (BOD) sample, taken at a treatment plant, tells the operator -
✅✅✅CORRECT -How the plant, was operating, 5 days ago
Question: Which of the following are dangerous gasses that are likely to be present in lift stations and
manholes - ✅✅✅CORRECT -Natural gas, gasoline fumes, hydrogen sulfide, and carbon dioxide
Question: What is the preferred, hydraulic method of cleaning sewer lines - ✅✅✅CORRECT -
Answers: Hydro Jet Cleaning
Question: what are some Ways, to reduce bad odors, generated in the collection system -
✅✅✅CORRECT -Answer:
Routinely cleaning, slow running, or low flow lines,
adding chlorine, or hydrogen peroxide, to the collection system
,Question: what are some Types of pipe materials commonly found in wastewater collection system -
✅✅✅CORRECT -Answer: ductile iron, Poly Vinyl Chloride, (PVC) vitrified clay pipe, fiberglass
Question: before entering a confined space, a worker should perform, what procedures -
✅✅✅CORRECT -Answer:have an approved monitoring device, and check, for the presence of
dangerous gasses, ventilate, the space with a blower, wear a safety harness, and be attach to a life line
A properly designed, and operated primary sedimentation tank, should remove what percent of
incoming BOD.
A.20% to 30%
B. 25 % to 50%
C. 30% to 40% - ✅✅✅CORRECT -C. 30 to 40%
What Devices, can be used, to determine, the level of sewage, in a lift station - ✅✅✅CORRECT -
Answer: air bubbler, floats, electrodes, Acoustic (sonic), radar
What, is the most important role, of aerobic bacteria, in the treatment, of wastewater? -
✅✅✅CORRECT -decomposition, of organic matter
Question: How is the hydraulic loading, of a trickling filter, determined - ✅✅✅CORRECT -
Answer:flow rate, and filter area
Question: what equipment, or methods, can be used, to dewater sludge - ✅✅✅CORRECT -Answer:
belt press, drying beds, solid bowl, centrifuge, gravity thickener
Question: what are the Most important factors, to providing adequate sewage treatment, in a
stabilization pond - ✅✅✅CORRECT -Answer: sunlight, algae, bacteria and, time
Question: what do Offensive, and objectionable odors, in a trickling filter, usually indicate -
✅✅✅CORRECT -Answer: septic conditions exist
, Question: Dissolved Oxygen, (DO) in a activated sludge, aeration tank, should be maintained in What
range - ✅✅✅CORRECT -Answer: 2, to 4, milligram, per liter
Question:what factors Contribute to infiltration in a collection system - ✅✅✅CORRECT -Answer:
breaks in the main lines, high ground water levels, heavy rains, hydro jet cleaning, of plugged mains
Question: what happen When a centrifugal pump loses prime - ✅✅✅CORRECT -Answer: it is no
longer moving liquid
A Rotating Biological Contactor, or , RBC, is a _______biological treatment process
A. fixed film
B. Surface film
C. suspended growth - ✅✅✅CORRECT -A. fixed film
Question:what Needs to be checked regularly, to properly operate, an activated sludge treatment plant -
✅✅✅CORRECT -Answer: aeration equipment, and mixed liquor solids
Question: what is Point source, discharge - ✅✅✅CORRECT -Answer: a discharge that comes from a
pipe or ditch that is monitored, controlled, and inspected
Question: what is a Non-point discharge - ✅✅✅CORRECT -Answer: a discharge that may have an
intermittent, or dispersed, flow having little, or no control
The Texas Water Code establishes the protection of water quality and quantity of the state by -
✅✅✅CORRECT -setting stream standards, issues permits for discharges, identifies non-point source
controls, and establishes water reuse.
The wastewater plant operator is primarily responsible for - ✅✅✅CORRECT -treating wastewater
discharged into the community
