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TCEQ Wastewater License Exam Comprehensive
Questions and Verified Detailed Solutions 100%
Correct
Environment --> Water Treatment --> Water Distribution
System --> Customer Use --> Wastewater Collection System -
-> Wastewater Treatment --> Environment
What are the steps of the Water Use Cycle?
- Removal of health hazards
- Prevention of odors and flies
- Cleanliness and appearance
- Comfort and convenience
What are the benefits of the collection system?
Septic wastewater doesn't contain dissolved oxygen and is
difficult to treat. Fresh wastewater contains dissolved
oxygen and is easier to treat, which results in higher quality
effluent
Septic vs. Fresh wastewater?
Surface runoff that enters the collection system
Inflow
Groundwater that enters the collection system through
holes, cracks, etc.
Infiltration
100 gallons per day
What is the average domestic contribution to the collection
system? (Per person/day)
Physical, Chemical, Bacteriological, and Radiological
What are the four wastewater characteristics?
99.9% water, 0.1% solids
Domestic wastewater is ___% water and ___% solids
, 2
Suspended solids that will settle when wastewater flow is
still or slow moving
Settleable solids
0 (most acidic) to 14 (most basic), 7 is neutral
What is the pH scale range?
Septic has lower pH due to volatile acids formed from
wastewater decomposition
Does septic or freshwater have a lower pH? Why?
A colorless, toxic, and flammable gas that resembles the
smell of rotten eggs. It results from the bacterial breakdown
of organic matter in the absence of oxygen. It is heavier than
air.
What is Hydrogen Sulfide (H2S)? When does it occur?
A colorless, odorless, and highly flammable gas. Methane is
an asphyxiant and is lighter than air. Digester gas contains
65% methane and is used for heating fuel or operating
equipment.
What is Methane? (CH4) What percentage of methane is in
digester gas?
A colorless, odorless gas that has a 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.
What is carbon dioxide? (CO2)
A colorless, odorless, and tasteless gas
What is carbon monoxide? (CO)
It may cause explosions, fires, line blockages, and odor
Why is oil and grease a concern if present in wastewater?
Excessive chlorides interfere with treatment processes,
especially trickling filters. They also affect laboratory tests.
What are chlorides and why are excessive chlorides in
wastewater bad?
It measures wastewater strength and the oxygen depleting
effect of wastewater effluent on the receiving stream.
Specifically, it indicates the amount of organic matter that
TCEQ Wastewater License Exam Comprehensive
Questions and Verified Detailed Solutions 100%
Correct
Environment --> Water Treatment --> Water Distribution
System --> Customer Use --> Wastewater Collection System -
-> Wastewater Treatment --> Environment
What are the steps of the Water Use Cycle?
- Removal of health hazards
- Prevention of odors and flies
- Cleanliness and appearance
- Comfort and convenience
What are the benefits of the collection system?
Septic wastewater doesn't contain dissolved oxygen and is
difficult to treat. Fresh wastewater contains dissolved
oxygen and is easier to treat, which results in higher quality
effluent
Septic vs. Fresh wastewater?
Surface runoff that enters the collection system
Inflow
Groundwater that enters the collection system through
holes, cracks, etc.
Infiltration
100 gallons per day
What is the average domestic contribution to the collection
system? (Per person/day)
Physical, Chemical, Bacteriological, and Radiological
What are the four wastewater characteristics?
99.9% water, 0.1% solids
Domestic wastewater is ___% water and ___% solids
, 2
Suspended solids that will settle when wastewater flow is
still or slow moving
Settleable solids
0 (most acidic) to 14 (most basic), 7 is neutral
What is the pH scale range?
Septic has lower pH due to volatile acids formed from
wastewater decomposition
Does septic or freshwater have a lower pH? Why?
A colorless, toxic, and flammable gas that resembles the
smell of rotten eggs. It results from the bacterial breakdown
of organic matter in the absence of oxygen. It is heavier than
air.
What is Hydrogen Sulfide (H2S)? When does it occur?
A colorless, odorless, and highly flammable gas. Methane is
an asphyxiant and is lighter than air. Digester gas contains
65% methane and is used for heating fuel or operating
equipment.
What is Methane? (CH4) What percentage of methane is in
digester gas?
A colorless, odorless gas that has a 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.
What is carbon dioxide? (CO2)
A colorless, odorless, and tasteless gas
What is carbon monoxide? (CO)
It may cause explosions, fires, line blockages, and odor
Why is oil and grease a concern if present in wastewater?
Excessive chlorides interfere with treatment processes,
especially trickling filters. They also affect laboratory tests.
What are chlorides and why are excessive chlorides in
wastewater bad?
It measures wastewater strength and the oxygen depleting
effect of wastewater effluent on the receiving stream.
Specifically, it indicates the amount of organic matter that
