Exam (elaborations)
Texas Wastewater A ( Test 2) (1).
- Module
- EDPNA - technical
- Institution
- EDPNA - Technical
Texas Wastewater A ( Test 2) (1).
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Texas Wastewater A ( Test 2)What is TCEQ doing to control, "point source" pollution in the Texas waterways? - correct
answer-TCEQ approves permits for domestic wastewater plants
and Permitting of industrial wastewater plants.
Describe proper design of force main wastewater lines. - correct answer-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? - correct answer-Ratio of outside pipe diameter, (OD) to
wall thickness (PVC)
gravity wastewater lines are designed - correct answer-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? - correct answer-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? - correct answer-As the complexity of an organization increases, the
management function of management becomes most important.
What is the effective chlorine disinfecting agent in disinfection? - correct
answer-Hypochlorous Acid (HOCl)
Hypochlorous Acid - correct answer-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? - correct answer-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? - correct answer-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? - correct answer-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? - correct
answer-Good sludge quality, will have a predominance , of Ciliated protozoa.
, When an RBC is operating correctly, how will the slime appear on the media? - correct
answer-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? -
correct answer-24 inch opening and 48 inch inside diameter
What activated sludge process does not achieve complete nitrification? - correct
answer-Contact Stabilization
In the selection of forced main wastewater piping, what is the minimum working pressure? -
correct answer-150 psi
The oxygen depletion of BOD dilution water should not exceed - correct answer-.2 mg/L.
What is the minimum air gap when making water and wastewater connections? - correct
answer-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? - correct answer-1 inch
An anaerobic digester must maintain an average year round temperature of - correct
answer-95 degrees
How do you remove shoring from a trench? - correct answer-From the bottom up
Which of the following methods would you use to increase the degree of nitrification in an
activated sludge plant? - correct answer-increase dissolved oxygen levels and increase the
sludge age
Which of the following are considered normal operator controls on an activated sludge plant?
- correct answer-*aeration rates *return and wasting rates
Reducing the return sludge flow rate, for an activated sludge system, which has a good
settling sludge will - correct answer-increase the RAS concentration, and the clarifier sludge
blanket thickness
An extended air activated sludge plant has a fast settling sludge and high amounts of pin floc
leaving the clarifier. One way to correct this problem is to - correct answer-* reduce the
MCRT, by wasting more,
* increase the F M ratio, by wasting more
The primary causes of wastewater stoppages are - correct answer-roots, and grease
The inside diameter of a manhole, must be ? - correct answer-48 inches in diameter
Digester gas should contain about - correct answer-65% - 75% methane
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