TX Class C Wastewater Treatment License EXAM 2025/2026
ACTUAL COMPLETE REAL EXAM QUESTIONS WITH
ACCURATE ANSWERS (VERIFIED ANSWERS) | GET
IT RIGHT!! GRADED A+ / 2025 BRAND NEW!!
What limiting factors affect bacteria growth? - ANSWER-
pH, temperature,
moisture and
food
What must the operator control in order for microorganisms
to do their job? -
ANSWER-the
environment
What by-products are excreted by microorganisms? - ANSWER-
CO2, H2O and
NH3 and
polysaccharides
How many times should a clarifier concentrate mixed liquor
solids? - ANSWER-
,at least two
times
Purpose of wasting solids from an activated sludge system is...
– ANSWER-remove excess biological solids, inert solids and
old/dead microorganisms
Control parameters for activated sludge plants - ANSWER-
oxygen levels,
wasting rates, sludge quality, return rates and aerator
solids levels
The air requirements in an activated sludge process are
governed by... -
ANSWER-organic loading on
the plant
Sludge bulking is corrected by.... - ANSWER-restoring
environmental balance to
favor floc-forming bacteria over
filamentous organisms
Rising sludge and gas bubbles can be caused by... - ANSWER-
denitrification in
,the final
clarifier
What test can give operators a visual check on sludge quality?
- ANSWER-30-
minute settling
test
A conventional activated sludge process has primary
clarifiers that remove
about ________ percent of the organic load.. -
ANSWER-30-40%
What activated sludge process parameters can an operator
change directly? -
ANSWER-aeration rates, waste rates, and return
sludge rates
What happens when the return sludge rate is too low? -
ANSWER-there will be
insufficient organisms to treat the waste load entering the
aeration basin and
the sludge blanket in the secondary clarifier could
become too high
, The RBC (rotating biological contactor) unit must be
preceded by a... -
ANSWER-primary clarifier or
fine screen
A condition(s) that adversely affect(s) the operation of a
rotating biological
contactor is... - ANSWER-toxic materials from industrial
wastes; hydrogen
sulfide; high or
low pH
A buildup of solids in the tank of the rotating biological
contactor may be caused
by... - ANSWER-poor primary
clarification
Advanced treatment processes strive to provide a
______________ removal level of specific compounds,
suspended solids, and oxygen-demanding materials than
cannot be achieved through secondary treatment alone. -
ANSWER-higher
Direct filtration of secondary effluent is often used to reduce
_____ solids to low
ACTUAL COMPLETE REAL EXAM QUESTIONS WITH
ACCURATE ANSWERS (VERIFIED ANSWERS) | GET
IT RIGHT!! GRADED A+ / 2025 BRAND NEW!!
What limiting factors affect bacteria growth? - ANSWER-
pH, temperature,
moisture and
food
What must the operator control in order for microorganisms
to do their job? -
ANSWER-the
environment
What by-products are excreted by microorganisms? - ANSWER-
CO2, H2O and
NH3 and
polysaccharides
How many times should a clarifier concentrate mixed liquor
solids? - ANSWER-
,at least two
times
Purpose of wasting solids from an activated sludge system is...
– ANSWER-remove excess biological solids, inert solids and
old/dead microorganisms
Control parameters for activated sludge plants - ANSWER-
oxygen levels,
wasting rates, sludge quality, return rates and aerator
solids levels
The air requirements in an activated sludge process are
governed by... -
ANSWER-organic loading on
the plant
Sludge bulking is corrected by.... - ANSWER-restoring
environmental balance to
favor floc-forming bacteria over
filamentous organisms
Rising sludge and gas bubbles can be caused by... - ANSWER-
denitrification in
,the final
clarifier
What test can give operators a visual check on sludge quality?
- ANSWER-30-
minute settling
test
A conventional activated sludge process has primary
clarifiers that remove
about ________ percent of the organic load.. -
ANSWER-30-40%
What activated sludge process parameters can an operator
change directly? -
ANSWER-aeration rates, waste rates, and return
sludge rates
What happens when the return sludge rate is too low? -
ANSWER-there will be
insufficient organisms to treat the waste load entering the
aeration basin and
the sludge blanket in the secondary clarifier could
become too high
, The RBC (rotating biological contactor) unit must be
preceded by a... -
ANSWER-primary clarifier or
fine screen
A condition(s) that adversely affect(s) the operation of a
rotating biological
contactor is... - ANSWER-toxic materials from industrial
wastes; hydrogen
sulfide; high or
low pH
A buildup of solids in the tank of the rotating biological
contactor may be caused
by... - ANSWER-poor primary
clarification
Advanced treatment processes strive to provide a
______________ removal level of specific compounds,
suspended solids, and oxygen-demanding materials than
cannot be achieved through secondary treatment alone. -
ANSWER-higher
Direct filtration of secondary effluent is often used to reduce
_____ solids to low
