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Wastewater B Test
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Exam of 9 pages for the course Basic Wastewater D at Basic Wastewater D (Wastewater B Test)
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Wastewater B TestPercent of volatile solids normally in sludge - correct answer-70-80%
D.O. levels in a primary clarifier - correct answer-0.5-1.0 MG/L
Why are precautionary measures needed around an aeration basin? - correct
answer-undertow and turbulence
O.S.H.A. approved trench - correct answer-narrow excavation in which the depth is greater
than the width; the width must be less than 15 feet
What causes bulking? - correct answer-1. Excessive hydraulic loading,
2. Solids not promptly removed from clarifier
3. Inadequate weir length
4. Improper ratio of depth to surface area of the final clarifier
What are the 5 elements of a trickling filter? - correct answer-1. Floor
2. under drain
3. Wall containing the filter bed
4. media
5. filter distribution arm
When and where are monthly reports submitted? - correct answer-by the 20th of the
following month; submitted to Austin
How and when do you report a bypass? - correct answer-as soon as possible by phone
within 24 hours; followed by in writing within 5 working days
What are the 5 events of stream purification? - correct answer-1. Pollution
2. Degradation
3. Decomposition
4. Recovery
5. Clear
What are the 2 methods for measuring D.O.? - correct answer-1. Winkler method
2. meter
What is needed for good communication? - correct answer-good listening
How much chlorine gas comes from one part liquid chlorine? - correct answer-450
What does the "F and M" stand for in the F:M Ratio? - correct answer-Food to
Microorganism
What feeds the nitrification organisms? - correct answer-fatty volatile acids
, An explosive atmosphere contains what 2 things? - correct answer-1. Oxygen
2. flammable gas vapor or dust
How deep should the drying bed sludge be? - correct answer-8-12 inches
Why is a low flow rated important when filling a drying bed? - correct answer-to prevent
undigested sludge from breaking through the ripe sludge blanket in the digester
Under a microscope what 2 organizms should be predominant? - correct answer-1. SILIATE
2. rotifers
The detention time in a contact stabilization plant is more or less than other extended
aeration plants? - correct answer-Less
What 2 things are chlorine used for? - correct answer-1. disinfection
2. odor control
What will a leaking chlorine container do? - correct answer-freeze up
How are plant goals best accomplished? - correct answer-planning, PM, records, analysis
What is the function of the bottom float in a lift station? - correct answer-turns the pump off
What must be used when connecting a potable water supply to a lift station? - correct
answer-an air gap between the pump and the water line twice the diameter of the water line
or at least 1", whichever is greater
What is the problem if the supernatant in the settleometer is clear but the effluent is not? -
correct answer-1. Bulking
2. An equipment malfuntion such as a plugged R.A.S. or W.A.S. line
3. problem in secondary clarifier
Why does flow through a clarifier move up slowly? - correct answer-to keep floc particles
from coming over the wiers
when should a manhole be placed? - correct answer-at least every 500 feet or whenever
necessary
Where should the sludge in the clarifier be kept in the activated sludge process? - correct
answer-bottom quarter
An S.V.I. of 180 represents what? - correct answer-old bulking sludge
What should be done to remove micro organisms from an activated sludge plant? - correct
answer-waste
What is the preliminary treatments main purpose? - correct answer-remove large solids
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