TEXAS CLASS C WASTEWATER TREATMENT LICENSE
EXAM 2025 | QUESTIONS CORRECT SOLUTIONS
In the removal process, what must bacteria do? - correct-answer-gather food,
digest food, utilize food and give off by-products
What limiting factors affect bacteria growth? - correct-answer-pH, temperature,
moisture and food
What must the operator control in order for microorganisms to do their
job? - correct-answer-the environment
What by-products are excreted by microorganisms? - correct-answer-CO2,
H2O and NH3 and polysaccharides
Treatment pond classifications are... - correct-answer-wastewater stabilization
ponds, aerated lagoons, facultative lagoons, anaerobic lagoons and hyacinth
ponds
What will a wastewater stabilization pond effectively reduce? - correct-answer-
,BOD and bacteria
Anaerobic lagoon dissolved oxygen content... - correct-answer-none
Facultative lagoon dissolved oxygen content... - correct-answer-DO on top and
none at bottom
Wastewater stabilization pond dissolved oxygen content... - correct-answer-DO
throughout (top, bottom and middle)
Depth of wastewater stabilization pond - correct-answer-3-5 ft deep
Wastewater stabilization ponds are... - correct-answer-aerobic, dependent upon
sunlight and shallower than facultative lagoons
Benefit of multiple inlets and outlets in treatment ponds are... - correct-answer-
prevention of short-circuiting and will assure an evenly distributed flow
The organic loading on wastewater stabilization ponds should not
exceed - correct-answer-35 lb. BOD/acre/day
,Depth of facultative lagoons is - correct-answer-5-8 ft deep
Raw wastewater anaerobic ponds are usually used by... - correct-answer-
livestock feedlots, meat packing operations and industrial wastes generators
Essential needs of an efficient wastewater stabilization pond... - correct-answer-
DO, algae and bacteria
The ideal orientation of a wastewater stabilization pond would be... -
correct- answer-parallel with prevailing winds
What does short-circuiting in a pond cause? - correct-answer-reduction in
detention time
A chemical factor influencing the efficiency of wastewater stabilization ponds
is... - correct-answer-carbon dioxide
Good housekeeping around ponds includes... - correct-answer-keeping dike
clean
, Control tests on pond efluents include - correct-answer-BOD, TSS and pH
Purpose of return activated sludge - correct-answer-to reseed the biological
reactor with treatment microorganisms
Describe activated sludge... - correct-answer-is fluffy and difficult to settle with
approximately 99% moisture content
How many times should a clarifier concentrate mixed liquor solids? -
correct- answer-at least two times
Purpose of wasting solids from an activated sludge system is... - correct-
answer- remove excess biological solids, inert solids and old/dead
microorganisms
Control parameters for activated sludge plants - correct-answer-oxygen levels,
wasting rates, sludge quality, return rates and aerator solids levels
The air requirements in an activated sludge process are governed by... -
correct- answer-organic loading on the plant
EXAM 2025 | QUESTIONS CORRECT SOLUTIONS
In the removal process, what must bacteria do? - correct-answer-gather food,
digest food, utilize food and give off by-products
What limiting factors affect bacteria growth? - correct-answer-pH, temperature,
moisture and food
What must the operator control in order for microorganisms to do their
job? - correct-answer-the environment
What by-products are excreted by microorganisms? - correct-answer-CO2,
H2O and NH3 and polysaccharides
Treatment pond classifications are... - correct-answer-wastewater stabilization
ponds, aerated lagoons, facultative lagoons, anaerobic lagoons and hyacinth
ponds
What will a wastewater stabilization pond effectively reduce? - correct-answer-
,BOD and bacteria
Anaerobic lagoon dissolved oxygen content... - correct-answer-none
Facultative lagoon dissolved oxygen content... - correct-answer-DO on top and
none at bottom
Wastewater stabilization pond dissolved oxygen content... - correct-answer-DO
throughout (top, bottom and middle)
Depth of wastewater stabilization pond - correct-answer-3-5 ft deep
Wastewater stabilization ponds are... - correct-answer-aerobic, dependent upon
sunlight and shallower than facultative lagoons
Benefit of multiple inlets and outlets in treatment ponds are... - correct-answer-
prevention of short-circuiting and will assure an evenly distributed flow
The organic loading on wastewater stabilization ponds should not
exceed - correct-answer-35 lb. BOD/acre/day
,Depth of facultative lagoons is - correct-answer-5-8 ft deep
Raw wastewater anaerobic ponds are usually used by... - correct-answer-
livestock feedlots, meat packing operations and industrial wastes generators
Essential needs of an efficient wastewater stabilization pond... - correct-answer-
DO, algae and bacteria
The ideal orientation of a wastewater stabilization pond would be... -
correct- answer-parallel with prevailing winds
What does short-circuiting in a pond cause? - correct-answer-reduction in
detention time
A chemical factor influencing the efficiency of wastewater stabilization ponds
is... - correct-answer-carbon dioxide
Good housekeeping around ponds includes... - correct-answer-keeping dike
clean
, Control tests on pond efluents include - correct-answer-BOD, TSS and pH
Purpose of return activated sludge - correct-answer-to reseed the biological
reactor with treatment microorganisms
Describe activated sludge... - correct-answer-is fluffy and difficult to settle with
approximately 99% moisture content
How many times should a clarifier concentrate mixed liquor solids? -
correct- answer-at least two times
Purpose of wasting solids from an activated sludge system is... - correct-
answer- remove excess biological solids, inert solids and old/dead
microorganisms
Control parameters for activated sludge plants - correct-answer-oxygen levels,
wasting rates, sludge quality, return rates and aerator solids levels
The air requirements in an activated sludge process are governed by... -
correct- answer-organic loading on the plant
