Wastewater Grade 3 Exam Questions with Verified Answers| Latest Update Graded A+
A progressive cavity pump is generally classified as a positive displacement pump. True
Both nitrogen gas and carbon dioxide are odorless, colorless, and nonflammable, but could
cause asphyxiation at concentrations much greater than normal. True
High l/l could contribute to poor performance of both primary and secondary processes.
True
Careful application of chlorine to the flow being applied to a trickling filter may be used to
correct certain operational problems. True
Most nitrogen in raw domestic sewage is either in the form of organic compounds, such as
proteins or as nitrate salts. False
Mud valves are built into many treatment plant basins that extend below ground level in order
to prevent damage from hydrostatic pressure. True
The most probable cause of the nitrification and an activated sludge plant is? The failure to
return the settled, mixed liquor to the aeration basin soon enough.
Which of the following is sometimes used as an additive and correcting anaerobic digestive
upsets? Anhydrous ammonia.
Which of the following statements is true in regard to the complete mix activated sludge
process? The rate of oxygen uptake per unit of activated sludge is about the same
throughout all of the aeration basin.
, When collecting a sample of chlorinated effluent for the total coliform test, which of the
following statements reflects the correct sampling procedure? Add sodium thiosulfate to
the bottle prior to sterilization of the collection bottle.
Which of the following would be regarded as within normal operating range for DAFT of waste
activated sludge using polymers? A solid loading rate of 1.0 lb/sq.ft.hr
SVI is best defined as? The volume occupied by 1 g of mixed liquor activated sludge solids
after settling for 30 minutes in a sludge settleability test.
Which of the following is a reasonable statement in regard to heating Anaerobic digesters?
It takes one BTU of heat energy to raise the temperature of 1 pound of sludge by 1°F.
Which one of the following statements is TRUE in regard to the coliform organism or test? If
coliform are found in a chlorinated secondary effluent, then one may assume that pathogens
are also in this effluent, assuming that pathogens were in raw wastewater.
If overflow rates in a primary clarifier are too low, the most likely results would be? Septic
odors.
The under drain system channels of trickling filters should not flow more than half full at full
hydraulic loading in order to? Ensure adequate ventilation.
The term endogenous respiration refers to? A situation where there are too many bugs
compared to the amount of available food, and these organisms utilize their own cell mass as a
source of food.
Hydraulic loading to a facultative wastewater pond is usually measured and units of?
Inches/day
A progressive cavity pump is generally classified as a positive displacement pump. True
Both nitrogen gas and carbon dioxide are odorless, colorless, and nonflammable, but could
cause asphyxiation at concentrations much greater than normal. True
High l/l could contribute to poor performance of both primary and secondary processes.
True
Careful application of chlorine to the flow being applied to a trickling filter may be used to
correct certain operational problems. True
Most nitrogen in raw domestic sewage is either in the form of organic compounds, such as
proteins or as nitrate salts. False
Mud valves are built into many treatment plant basins that extend below ground level in order
to prevent damage from hydrostatic pressure. True
The most probable cause of the nitrification and an activated sludge plant is? The failure to
return the settled, mixed liquor to the aeration basin soon enough.
Which of the following is sometimes used as an additive and correcting anaerobic digestive
upsets? Anhydrous ammonia.
Which of the following statements is true in regard to the complete mix activated sludge
process? The rate of oxygen uptake per unit of activated sludge is about the same
throughout all of the aeration basin.
, When collecting a sample of chlorinated effluent for the total coliform test, which of the
following statements reflects the correct sampling procedure? Add sodium thiosulfate to
the bottle prior to sterilization of the collection bottle.
Which of the following would be regarded as within normal operating range for DAFT of waste
activated sludge using polymers? A solid loading rate of 1.0 lb/sq.ft.hr
SVI is best defined as? The volume occupied by 1 g of mixed liquor activated sludge solids
after settling for 30 minutes in a sludge settleability test.
Which of the following is a reasonable statement in regard to heating Anaerobic digesters?
It takes one BTU of heat energy to raise the temperature of 1 pound of sludge by 1°F.
Which one of the following statements is TRUE in regard to the coliform organism or test? If
coliform are found in a chlorinated secondary effluent, then one may assume that pathogens
are also in this effluent, assuming that pathogens were in raw wastewater.
If overflow rates in a primary clarifier are too low, the most likely results would be? Septic
odors.
The under drain system channels of trickling filters should not flow more than half full at full
hydraulic loading in order to? Ensure adequate ventilation.
The term endogenous respiration refers to? A situation where there are too many bugs
compared to the amount of available food, and these organisms utilize their own cell mass as a
source of food.
Hydraulic loading to a facultative wastewater pond is usually measured and units of?
Inches/day
