Wastewater B Test Questions And Answers
Rated A+ 2024/25.
Percent 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
Rated A+ 2024/25.
Percent 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
