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Texas Wastewater A ( Test 2) Questions & answers
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Texas Wastewater A ( Test 2) Questions & answers
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Texas Wastewater A ( Test 2)What is TCEQ doing to control, "point source" pollution in the Texas waterways? -
ANS-TCEQ approves permits for domestic wastewater plants
and Permitting of industrial wastewater plants.
Describe proper design of force main wastewater lines. - ANS-Minimum two feet per
second velocity, with the smallest pump operating alone. Minimum four inch diameter
pipe, with 150 psi rating.
What is Standard Dimension Ratio? - ANS-Ratio of outside pipe diameter, (OD) to wall
thickness (PVC)
gravity wastewater lines are designed - ANS-to flow half full ,under normal conditions, at
a minimum of two feet per second, and a maximum of ten feet per second.
What is the standard chlorine residual, and minimum contact time, on Texas wastewater
permits? - ANS-1 milligram per liter for a minimum 20 minutes detention time at peak
flow. However, no chlorine residual needed, if detention time is greater than 21 days.
As the complexity of an organization increases, what management function becomes
most important? - ANS-As the complexity of an organization increases, the
management function of management becomes most important.
What is the effective chlorine disinfecting agent in disinfection? - ANS-Hypochlorous
Acid (HOCl)
Hypochlorous Acid - ANS-it is much more effective at pH levels below 7 .above
ph.of....7 the acid begins to be neutralized.
What is the effluent chlorine residual in Texas that is standard on permits and the
minimum detention time? What is the maximum residual allowed? - ANS-The Texas
standard, is 1 milligrams per liter, for a minimum 20 minutes detention time, at peak
flow. Maximum residual allowed, is 4 milligrams per liter.
Anaerobic digester gas should contain? - ANS-65 to 75% methane, 25 to 35% carbon
dioxide, and 1 to 5% nitrogen.
What are some of the causes of filaments in the aeration basin? - ANS-low DO,
, low organic loading,
septic wastes,
nutrient deficiencies, and.
high sulfur content
Good sludge quality will have a predominance of what organisms in the MLSS? -
ANS-Good sludge quality, will have a predominance , of Ciliated protozoa.
When an RBC is operating correctly, how will the slime appear on the media? -
ANS-When an RBC is operating correctly, the slime will appear Grey to brown and have
.05 to .1 inches thick zoogloeal mass.
According to design criteria, what are the minimum allowable diameters for a manhole?
- ANS-24 inch opening and 48 inch inside diameter
What activated sludge process does not achieve complete nitrification? - ANS-Contact
Stabilization
In the selection of forced main wastewater piping, what is the minimum working
pressure? - ANS-150 psi
The oxygen depletion of BOD dilution water should not exceed - ANS-.2 mg/L.
What is the minimum air gap when making water and wastewater connections? -
ANS-Minimum of one inch or twice the inlet pipe size whichever is greater.
What is the minimum useful size pipe to prime a centrifugal pump? - ANS-1 inch
An anaerobic digester must maintain an average year round temperature of - ANS-95
degrees
How do you remove shoring from a trench? - ANS-From the bottom up
Which of the following methods would you use to increase the degree of nitrification in
an activated sludge plant? - ANS-increase dissolved oxygen levels and increase the
sludge age
Which of the following are considered normal operator controls on an activated sludge
plant? - ANS-*aeration rates *return and wasting rates
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