TEXAS WASTEWATER A EXAM
QUESTIONS WITH
ANSWERS 100% CORRECT
Students also studied
C
Terms in this set (91)
What is TCEQ doing to control "point *Permitting of domestic wastewater plants
source" pollution of the Texas waterways? *Permitting of industrial wastewater plants
Describe proper design of force main Minimum two fps velocity with the smallest pump operating
wastewater lines. alone. Minimum four inch diameter pipe with 150 psi rating.
What is Standard Dimension Ratio? Ratio of outside pipe diameter (OD) to wall thickness (PVC)
Describe proper design of Designed to flow half full ,under normal conditions, at
gravity wastewater lines. a minimum of two fps and a maximum of ten fps.
,Manholes should have a minimum opening 24 inches and be at least 4 feet wide.
of?
pH meters should be calibrated how often? Daily with at least two buffers.
What standards should be used for
calibration purposes?
What is the standard chlorine residual and a. 1.0 mg/L for a minimum 20 minutes detention time at peak
minimum contact time on Texas wastewater flow b. No chlorine residual needed if detention time is
permits?
greater than 21 days
As the complexity of an organization Planning
increases, what management function
becomes most important?
What is the effective chlorine disinfecting Hypochlorous Acid (HOCl)
agent?
, Does pH affect the chlorination process? When using free chlorine the disinfectant is HOCl acid. As
Explain your answer. such it is much more effective at pH's below 7.0. Above 7.0 pH
the acid begins to be neutralized.
What is the effluent chlorine residual in Texas standard is 1.0 mg/L for a minimum 20 minutes detention
Texas that is standard on permits and the time at peak flow. Maximum residual allowed is 4.0 mg/L.
minimum detention time? What is the
maximum residual allowed?
A treatment plant has a clarifier that is 60 Formula
feet in diameter and is 10 feet deep. The
weir is 2 feet inside the outer clarifier
wall. The
flow is 1.0 MGD. The weir and outflow
channel is 3 feet deep. a. What is the
detention time in hours?
What activated process cannot nitrify in a Contact Stabilization
single stage?
What is the GPM output of a piston Formula
pump with an 8-inch diameter piston with a
10-inch stroke operating at 50 strokes per
minute?
A treatment plant has a clarifier that is 60 Formulas
feet in diameter and is 10 feet deep. The
weir is 2 feet inside the outer clarifier
wall. The
flow is 1.0 MGD. The weir and outflow
channel is 3 feet deep.
a.What is the detention time in hours?
b.What is the surface loading
in gal/ft2/day?
c. What is the weir loading in gal/linear
ft/day?
A primary clarifier has a flow of 3.0 MGD Formulas
and has a diameter of 100 feet. It is 12 feet
deep and has 24 inches of freeboard. What
is the detention time in hours?
Anaerobic digester gas should contain? 65-75% methane, 25-35% carbon dioxide and 1-5% nitrogen.
QUESTIONS WITH
ANSWERS 100% CORRECT
Students also studied
C
Terms in this set (91)
What is TCEQ doing to control "point *Permitting of domestic wastewater plants
source" pollution of the Texas waterways? *Permitting of industrial wastewater plants
Describe proper design of force main Minimum two fps velocity with the smallest pump operating
wastewater lines. alone. Minimum four inch diameter pipe with 150 psi rating.
What is Standard Dimension Ratio? Ratio of outside pipe diameter (OD) to wall thickness (PVC)
Describe proper design of Designed to flow half full ,under normal conditions, at
gravity wastewater lines. a minimum of two fps and a maximum of ten fps.
,Manholes should have a minimum opening 24 inches and be at least 4 feet wide.
of?
pH meters should be calibrated how often? Daily with at least two buffers.
What standards should be used for
calibration purposes?
What is the standard chlorine residual and a. 1.0 mg/L for a minimum 20 minutes detention time at peak
minimum contact time on Texas wastewater flow b. No chlorine residual needed if detention time is
permits?
greater than 21 days
As the complexity of an organization Planning
increases, what management function
becomes most important?
What is the effective chlorine disinfecting Hypochlorous Acid (HOCl)
agent?
, Does pH affect the chlorination process? When using free chlorine the disinfectant is HOCl acid. As
Explain your answer. such it is much more effective at pH's below 7.0. Above 7.0 pH
the acid begins to be neutralized.
What is the effluent chlorine residual in Texas standard is 1.0 mg/L for a minimum 20 minutes detention
Texas that is standard on permits and the time at peak flow. Maximum residual allowed is 4.0 mg/L.
minimum detention time? What is the
maximum residual allowed?
A treatment plant has a clarifier that is 60 Formula
feet in diameter and is 10 feet deep. The
weir is 2 feet inside the outer clarifier
wall. The
flow is 1.0 MGD. The weir and outflow
channel is 3 feet deep. a. What is the
detention time in hours?
What activated process cannot nitrify in a Contact Stabilization
single stage?
What is the GPM output of a piston Formula
pump with an 8-inch diameter piston with a
10-inch stroke operating at 50 strokes per
minute?
A treatment plant has a clarifier that is 60 Formulas
feet in diameter and is 10 feet deep. The
weir is 2 feet inside the outer clarifier
wall. The
flow is 1.0 MGD. The weir and outflow
channel is 3 feet deep.
a.What is the detention time in hours?
b.What is the surface loading
in gal/ft2/day?
c. What is the weir loading in gal/linear
ft/day?
A primary clarifier has a flow of 3.0 MGD Formulas
and has a diameter of 100 feet. It is 12 feet
deep and has 24 inches of freeboard. What
is the detention time in hours?
Anaerobic digester gas should contain? 65-75% methane, 25-35% carbon dioxide and 1-5% nitrogen.
