TCEQ Wastewater
License Exam
, What are the steps of the Water Use Cycle? - CORRECT ANSWERS-Environment -->
Water Treatment --> Water Distribution System --> Customer Use --> Wastewater
Collection System --> Wastewater Treatment --> Environment
What are the benefits of the collection system? - CORRECT ANSWERS-- Removal of
health hazards
- Prevention of odors and flies
- Cleanliness and appearance
- Comfort and convenience
Septic vs. Fresh wastewater? - CORRECT ANSWERS-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
Inflow - CORRECT ANSWERS-Surface runoff that enters the collection system
Infiltration - CORRECT ANSWERS-Groundwater that enters the collection system
through holes, cracks, etc.
What is the average domestic contribution to the collection system? (Per person/day) -
CORRECT ANSWERS-100 gallons per day
What are the four wastewater characteristics? - CORRECT ANSWERS-Physical,
Chemical, Bacteriological, and Radiological
Domestic wastewater is ___% water and ___% solids - CORRECT ANSWERS-99.9%
water, 0.1% solids
Settleable solids - CORRECT ANSWERS-Suspended solids that will settle when
wastewater flow is still or slow moving
What is the pH scale range? - CORRECT ANSWERS-0 (most acidic) to 14 (most
basic), 7 is neutral
Does septic or freshwater have a lower pH? Why? - CORRECT ANSWERS-Septic has
lower pH due to volatile acids formed from wastewater decomposition
What is Hydrogen Sulfide (H2S)? When does it occur? - CORRECT ANSWERS-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 Methane? (CH4) What percentage of methane is in digester gas? - CORRECT
ANSWERS-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.
License Exam
, What are the steps of the Water Use Cycle? - CORRECT ANSWERS-Environment -->
Water Treatment --> Water Distribution System --> Customer Use --> Wastewater
Collection System --> Wastewater Treatment --> Environment
What are the benefits of the collection system? - CORRECT ANSWERS-- Removal of
health hazards
- Prevention of odors and flies
- Cleanliness and appearance
- Comfort and convenience
Septic vs. Fresh wastewater? - CORRECT ANSWERS-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
Inflow - CORRECT ANSWERS-Surface runoff that enters the collection system
Infiltration - CORRECT ANSWERS-Groundwater that enters the collection system
through holes, cracks, etc.
What is the average domestic contribution to the collection system? (Per person/day) -
CORRECT ANSWERS-100 gallons per day
What are the four wastewater characteristics? - CORRECT ANSWERS-Physical,
Chemical, Bacteriological, and Radiological
Domestic wastewater is ___% water and ___% solids - CORRECT ANSWERS-99.9%
water, 0.1% solids
Settleable solids - CORRECT ANSWERS-Suspended solids that will settle when
wastewater flow is still or slow moving
What is the pH scale range? - CORRECT ANSWERS-0 (most acidic) to 14 (most
basic), 7 is neutral
Does septic or freshwater have a lower pH? Why? - CORRECT ANSWERS-Septic has
lower pH due to volatile acids formed from wastewater decomposition
What is Hydrogen Sulfide (H2S)? When does it occur? - CORRECT ANSWERS-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 Methane? (CH4) What percentage of methane is in digester gas? - CORRECT
ANSWERS-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.
