TEXAS WASTEWATER FULL SOLUTION
PAPER 2026 QUESTIONS WITH ANSWERS
GRADED A+
◉A wastewater treatment plant has a clarifier that is 80 feet in
diameter and is 12 feet deep. The flow is 2.5 mgd. The single weir is
two feet inside the outer wall and is 3 feet deep. What is the clarifier
detention time in hours?. Answer: What is the clarifier detention
time in hours? 2,500,000 gpd - 104,167 gph 24 hrs/day 3.14 x 40 x
40 x 9 x 7.48 gal 3.14 x 36 x 36 x 3 x 7.48 = 91,318 338,216 + 91,318
429,534 gallons 429,534 gals = 4.1 hrs 104,167 gph 4.1
◉What is the hydraulic loading on the clarifier in gal/sq ft/day?.
Answer: 3.14 x 38 x 38 = 4,534 sq ft 2,500,000 gpd = 551 gal / sq ft I
day 4,534 sq ft 551
◉What is the weir loading in gal/linear ft/day? 3.14 x 76 = 239 ft of
weir 2,500,000 gpd = 10,460 gal / lin ft / day 239 ft weir. Answer:
10,460
◉In Texas, an oxidation ditch treatment plant is referred to as.
Answer: Racetrack
, ◉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 population equivalent of this industry is. Answer: 500
lbs - 2,941 0.17 lbs BOD/ person 2941
◉What substance will interfere with a DPD chlorine test?. Answer:
Manganese
◉The parameters of the BOD test are. Answer: 5 days at 20°
Centigrade
◉An Imhoff tank is what type of treatment process?. Answer:
Primary
◉Standard Dimension Ratio in pve pipe is defined as. Answer: Ratio
of OD pipe diameter to wall thickness
◉MSDS sheets must be kept for how many years after you have
stopped using the chemical?. Answer: c. 30
◉A pneumatic ejector is. Answer: a. a lift station pumping device
PAPER 2026 QUESTIONS WITH ANSWERS
GRADED A+
◉A wastewater treatment plant has a clarifier that is 80 feet in
diameter and is 12 feet deep. The flow is 2.5 mgd. The single weir is
two feet inside the outer wall and is 3 feet deep. What is the clarifier
detention time in hours?. Answer: What is the clarifier detention
time in hours? 2,500,000 gpd - 104,167 gph 24 hrs/day 3.14 x 40 x
40 x 9 x 7.48 gal 3.14 x 36 x 36 x 3 x 7.48 = 91,318 338,216 + 91,318
429,534 gallons 429,534 gals = 4.1 hrs 104,167 gph 4.1
◉What is the hydraulic loading on the clarifier in gal/sq ft/day?.
Answer: 3.14 x 38 x 38 = 4,534 sq ft 2,500,000 gpd = 551 gal / sq ft I
day 4,534 sq ft 551
◉What is the weir loading in gal/linear ft/day? 3.14 x 76 = 239 ft of
weir 2,500,000 gpd = 10,460 gal / lin ft / day 239 ft weir. Answer:
10,460
◉In Texas, an oxidation ditch treatment plant is referred to as.
Answer: Racetrack
, ◉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 population equivalent of this industry is. Answer: 500
lbs - 2,941 0.17 lbs BOD/ person 2941
◉What substance will interfere with a DPD chlorine test?. Answer:
Manganese
◉The parameters of the BOD test are. Answer: 5 days at 20°
Centigrade
◉An Imhoff tank is what type of treatment process?. Answer:
Primary
◉Standard Dimension Ratio in pve pipe is defined as. Answer: Ratio
of OD pipe diameter to wall thickness
◉MSDS sheets must be kept for how many years after you have
stopped using the chemical?. Answer: c. 30
◉A pneumatic ejector is. Answer: a. a lift station pumping device
