TCEQ Wastewater License Exam (2026)
comprehensive questions and verified detailed
solutions ( MULTIPLE CHOICES) |100% CORRECT!!
Save
Terms in this set (112)
Environment --> Water Treatment --> What are the steps of the Water Use Cycle?
Water Distribution System -->
Customer Use --> Wastewater
Collection System --> Wastewater
Treatment --> Environment
- Removal of health hazards What are the benefits of the collection system?
- Prevention of odors and flies
- Cleanliness and appearance
- Comfort and convenience
Septic wastewater doesn't contain Septic vs. Fresh wastewater?
dissolved oxygen and is difficult to
treat. Fresh wastewater contains
dissolved oxygen and is easier to
treat, which results in higher quality
effluent
Surface runoff that enters the Inflow
collection system
,Groundwater that enters the Infiltration
collection system through holes,
cracks, etc.
100 gallons per day What is the average domestic contribution to the
collection system? (Per person/day)
Physical, Chemical, Bacteriological, What are the four wastewater characteristics?
and Radiological
99.9% water, 0.1% solids Domestic wastewater is ___% water and ___% solids
Suspended solids that will settle Settleable solids
when wastewater flow is still or slow
moving
0 (most acidic) to 14 (most basic), 7 is What is the pH scale range?
neutral
Septic has lower pH due to volatile Does septic or freshwater have a lower pH? Why?
acids formed from wastewater
decomposition
A colorless, toxic, and flammable What is Hydrogen Sulfide (H2S)? When does it
gas that resembles the smell of occur?
rotten eggs. It results from the
bacterial breakdown of organic
matter in the absence of oxygen. It is
heavier than air.
, A colorless, odorless, and highly What is Methane? (CH4) What percentage of
flammable gas. Methane is an methane is in digester gas?
asphyxiant and is lighter than air.
Digester gas contains 65% methane
and is used for heating fuel or
operating equipment.
A colorless, odorless gas that has a What is carbon dioxide? (CO2)
suffocating effect. When inhaled at
higher than normal concentrations, it
can produce a sour taste in the
mouth and a stinging sensation in the
nose and throat.
A colorless, odorless, and tasteless What is carbon monoxide? (CO)
gas
It may cause explosions, fires, line Why is oil and grease a concern if present in
blockages, and odor wastewater?
Excessive chlorides interfere with What are chlorides and why are excessive
treatment processes, especially chlorides in wastewater bad?
trickling filters. They also affect
laboratory tests.
It measures wastewater strength and What does the BOD test measure?
the oxygen depleting effect of
wastewater effluent on the receiving
stream. Specifically, it indicates the
amount of organic matter that can
be oxidized by biological and
chemical action in five days at 20
degrees Celsius.
comprehensive questions and verified detailed
solutions ( MULTIPLE CHOICES) |100% CORRECT!!
Save
Terms in this set (112)
Environment --> Water Treatment --> What are the steps of the Water Use Cycle?
Water Distribution System -->
Customer Use --> Wastewater
Collection System --> Wastewater
Treatment --> Environment
- Removal of health hazards What are the benefits of the collection system?
- Prevention of odors and flies
- Cleanliness and appearance
- Comfort and convenience
Septic wastewater doesn't contain Septic vs. Fresh wastewater?
dissolved oxygen and is difficult to
treat. Fresh wastewater contains
dissolved oxygen and is easier to
treat, which results in higher quality
effluent
Surface runoff that enters the Inflow
collection system
,Groundwater that enters the Infiltration
collection system through holes,
cracks, etc.
100 gallons per day What is the average domestic contribution to the
collection system? (Per person/day)
Physical, Chemical, Bacteriological, What are the four wastewater characteristics?
and Radiological
99.9% water, 0.1% solids Domestic wastewater is ___% water and ___% solids
Suspended solids that will settle Settleable solids
when wastewater flow is still or slow
moving
0 (most acidic) to 14 (most basic), 7 is What is the pH scale range?
neutral
Septic has lower pH due to volatile Does septic or freshwater have a lower pH? Why?
acids formed from wastewater
decomposition
A colorless, toxic, and flammable What is Hydrogen Sulfide (H2S)? When does it
gas that resembles the smell of occur?
rotten eggs. It results from the
bacterial breakdown of organic
matter in the absence of oxygen. It is
heavier than air.
, A colorless, odorless, and highly What is Methane? (CH4) What percentage of
flammable gas. Methane is an methane is in digester gas?
asphyxiant and is lighter than air.
Digester gas contains 65% methane
and is used for heating fuel or
operating equipment.
A colorless, odorless gas that has a What is carbon dioxide? (CO2)
suffocating effect. When inhaled at
higher than normal concentrations, it
can produce a sour taste in the
mouth and a stinging sensation in the
nose and throat.
A colorless, odorless, and tasteless What is carbon monoxide? (CO)
gas
It may cause explosions, fires, line Why is oil and grease a concern if present in
blockages, and odor wastewater?
Excessive chlorides interfere with What are chlorides and why are excessive
treatment processes, especially chlorides in wastewater bad?
trickling filters. They also affect
laboratory tests.
It measures wastewater strength and What does the BOD test measure?
the oxygen depleting effect of
wastewater effluent on the receiving
stream. Specifically, it indicates the
amount of organic matter that can
be oxidized by biological and
chemical action in five days at 20
degrees Celsius.
