WASTEWATER TREATMENT CLASS
B EXAMINATION PREP QUESTIONS
ANSWERS EXPERT VERIFIED
◉ D.O. levels in a primary clarifier Answer: 0.5-1.0 MG/L
◉ Why are precautionary measures needed around an aeration
basin? Answer: undertow and turbulence
◉ O.S.H.A. approved trench Answer: narrow excavation in which the
depth is greater than the width; the width must be less than 15 feet
◉ What causes bulking? 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? 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? Answer: by the
20th of the following month; submitted to Austin
◉ How and when do you report a bypass? 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? Answer: 1. Pollution
2. Degradation
3. Decomposition
4. Recovery
5. Clear
◉ What are the 2 methods for measuring D.O.? Answer: 1. Winkler
method
2. meter
◉ What is needed for good communication? Answer: good listening
, ◉ How much chlorine gas comes from one part liquid chlorine?
Answer: 450
◉ What does the "F and M" stand for in the F:M Ratio? Answer: Food
to Microorganism
◉ What feeds the nitrification organisms? Answer: fatty volatile
acids
◉ An explosive atmosphere contains what 2 things? Answer: 1.
Oxygen
2. flammable gas vapor or dust
◉ How deep should the drying bed sludge be? Answer: 8-12 inches
◉ Why is a low flow rated important when filling a drying bed?
Answer: to prevent undigested sludge from breaking through the
ripe sludge blanket in the digester
◉ Under a microscope what 2 organizms should be predominant?
Answer: 1. SILIATE
2. rotifers
B EXAMINATION PREP QUESTIONS
ANSWERS EXPERT VERIFIED
◉ D.O. levels in a primary clarifier Answer: 0.5-1.0 MG/L
◉ Why are precautionary measures needed around an aeration
basin? Answer: undertow and turbulence
◉ O.S.H.A. approved trench Answer: narrow excavation in which the
depth is greater than the width; the width must be less than 15 feet
◉ What causes bulking? 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? 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? Answer: by the
20th of the following month; submitted to Austin
◉ How and when do you report a bypass? 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? Answer: 1. Pollution
2. Degradation
3. Decomposition
4. Recovery
5. Clear
◉ What are the 2 methods for measuring D.O.? Answer: 1. Winkler
method
2. meter
◉ What is needed for good communication? Answer: good listening
, ◉ How much chlorine gas comes from one part liquid chlorine?
Answer: 450
◉ What does the "F and M" stand for in the F:M Ratio? Answer: Food
to Microorganism
◉ What feeds the nitrification organisms? Answer: fatty volatile
acids
◉ An explosive atmosphere contains what 2 things? Answer: 1.
Oxygen
2. flammable gas vapor or dust
◉ How deep should the drying bed sludge be? Answer: 8-12 inches
◉ Why is a low flow rated important when filling a drying bed?
Answer: to prevent undigested sludge from breaking through the
ripe sludge blanket in the digester
◉ Under a microscope what 2 organizms should be predominant?
Answer: 1. SILIATE
2. rotifers
