TEXAS WASTEWATER PRACTICE PAPER
2026 QUESTIONS WITH SOLUTIONS
GRADED A+
◉When is blue-green algae the most dominant on a pond treatment
system?. Answer: Summer
◉A 30-inch diameter wastewater interceptor is observed to be
flowing half-full at about two fps. The approximate volume of
wastewater flowing through the pipe is 3.14x1.25 x 1.25 x 2 = 4.9 cfs
x 449 = 2,200 gpm. Answer: c. 2,200 gallons per minute
◉A one-cylinder reciprocating sludge pump with a 10-inch bore and
a 5-inch stroke pumps at a rate of 50 cycles per minute. How many
minutes must the pump be operated to pump 5,000 gallons of
sludge? 3.14x0.416 x 0.416 x0.416 x 50 x7.48 = 84.5 gpm 5000 gal =
59,2min 84.5 gpm b. 29. Answer: 60 minutes
◉If an existing centrifugal pump motor is replaced with a motor
with 25 percent more speed, the motor horsepower required will
increase by 1.25 x 1.25 x 1.25 = 1.95. Answer: 95 percent
,◉When must TCEQ be notified about expansions of a treatment
facility?. Answer: Before construction
◉In an anaerobic digester, the percentage of methane and carbon
dioxide gas content should be. Answer: 70% methane, 30% carbon
dioxide
◉The temperature of an anaerobic digester should be maintained at
a minimum of. Answer: 95° F
◉What type of wastewater treatment operates in the endogenous
bacteria growth phase?. Answer: Extended air
◉Why is recirculation needed in a trickling filter?. Answer: Keep the
media wet Further reduce BOD All of the above (a, b, and c)
◉What type of fire extinguisher would be used on an electrical
control panel that has been de-energized?. Answer: Class A Class C
(a and d)
◉Disinfection with chlorine is the most effective at a pH of. Answer:
6.0
, ◉The biomass on a normal functioning RBC has what appearance?.
Answer: Grey to brown and 0.05 to 0.1 inch thick
◉The sludge from a primary clarifier should percent solids?.
Answer: 4% to 6%
◉What is eutrophication in a pond system?. Answer: Enrichment
with nitrogen and phosphorous Causes algae blooms (b and c)
◉How often should pH meters be calibrated?. Answer: Daily
◉In Texas, pH meters are required to be calibrated on how many
buffers?. Answer: two
◉An industrial complex has a BOD discharge to the POTW of 500
pounds per day. The population equivalent of this industry is 500 lbs
= 2,941 0.17 lbs BOD person. Answer: 2941
◉The parameters of the BOD test are. Answer: 5 days at 20°
Centigrade
◉Standard Dimension Ratio in pvc pipe is defined as. Answer: Ratio
of OD pipe diameter to wall thickness
2026 QUESTIONS WITH SOLUTIONS
GRADED A+
◉When is blue-green algae the most dominant on a pond treatment
system?. Answer: Summer
◉A 30-inch diameter wastewater interceptor is observed to be
flowing half-full at about two fps. The approximate volume of
wastewater flowing through the pipe is 3.14x1.25 x 1.25 x 2 = 4.9 cfs
x 449 = 2,200 gpm. Answer: c. 2,200 gallons per minute
◉A one-cylinder reciprocating sludge pump with a 10-inch bore and
a 5-inch stroke pumps at a rate of 50 cycles per minute. How many
minutes must the pump be operated to pump 5,000 gallons of
sludge? 3.14x0.416 x 0.416 x0.416 x 50 x7.48 = 84.5 gpm 5000 gal =
59,2min 84.5 gpm b. 29. Answer: 60 minutes
◉If an existing centrifugal pump motor is replaced with a motor
with 25 percent more speed, the motor horsepower required will
increase by 1.25 x 1.25 x 1.25 = 1.95. Answer: 95 percent
,◉When must TCEQ be notified about expansions of a treatment
facility?. Answer: Before construction
◉In an anaerobic digester, the percentage of methane and carbon
dioxide gas content should be. Answer: 70% methane, 30% carbon
dioxide
◉The temperature of an anaerobic digester should be maintained at
a minimum of. Answer: 95° F
◉What type of wastewater treatment operates in the endogenous
bacteria growth phase?. Answer: Extended air
◉Why is recirculation needed in a trickling filter?. Answer: Keep the
media wet Further reduce BOD All of the above (a, b, and c)
◉What type of fire extinguisher would be used on an electrical
control panel that has been de-energized?. Answer: Class A Class C
(a and d)
◉Disinfection with chlorine is the most effective at a pH of. Answer:
6.0
, ◉The biomass on a normal functioning RBC has what appearance?.
Answer: Grey to brown and 0.05 to 0.1 inch thick
◉The sludge from a primary clarifier should percent solids?.
Answer: 4% to 6%
◉What is eutrophication in a pond system?. Answer: Enrichment
with nitrogen and phosphorous Causes algae blooms (b and c)
◉How often should pH meters be calibrated?. Answer: Daily
◉In Texas, pH meters are required to be calibrated on how many
buffers?. Answer: two
◉An industrial complex has a BOD discharge to the POTW of 500
pounds per day. The population equivalent of this industry is 500 lbs
= 2,941 0.17 lbs BOD person. Answer: 2941
◉The parameters of the BOD test are. Answer: 5 days at 20°
Centigrade
◉Standard Dimension Ratio in pvc pipe is defined as. Answer: Ratio
of OD pipe diameter to wall thickness
