Ca Grade 2 Wastewater Treatment Operator Practice
Exam 1 verified with correct answers
What does the M in F/M ratio represent?- answer>>> >>>The mixed liquor volatile
suspended solids in the aeration tank
In general, how will warmer temp affect the settling rate of solids in a clarifer?-
answer>>> >>>Increase the settling rate
What could happen if the digester gas is mixed with air(85 to 95% by volume)?-
answer>>> >>>Cause an explosion
How will algae impact the chlorine demand in the pond effluent?- answer>>>
>>>increase the chlorine demand
Which of the following is true about a positive displacement pump?- answer>>> >>>it
must never be started with the discharge valve closed
What is true about the F/M ratio?- answer>>> >>>the volume of the secondary clarifier
is not needed to determine the f/m ratio
Which of the following is one of the basic rules of lab work?- answer>>> >>>never pipet
hazardous material with your mouth, even if the pipet has been sterialized
What is the recirculation ratio for a trickling filter?- answer>>> >>>Qr/Q
Which of the following is true about COD and BOD?- answer>>> >>>they are indirect
measurements of the organic content in the influent
What is the purpose of the grit channel?- answer>>> >>>remove heavy inorganic waste
Which of the following is true about the extended aeration process?- answer>>> >>>it
does not produce as much waste sludge as other processes
What is the correct formula for solids in raw wastewater?- answer>>> >>>Non
settleable solids + settleable solids = total suspended solids
What is freeboard in a waste stabilization pond?- answer>>> >>>the vertical distance
from normal water surface to the top of the levee
What is one of the requirements for a BOD test?- answer>>> >>>The BOD bottle
should be completely filled to the top
What should be scheduled every 3 months for a flamer arrester in an anaerobic
digester?- answer>>> >>>maintenance
, What is common practice in an activated sludge process?- answer>>> >>>recirculate
activated sludge
Prior to entering a permit-required confined space, what should you verify?- answer>>>
>>>a standby person should be located outside the entrance to the confined space,
while another person should be within sight or call of the standby person
What is a common way to determine the organic strength of wastes in the influent?-
answer>>> >>>test for the biochemical oxygen demand
What should you do if you are mildly exposed to chlorine gas?- answer>>>
>>>immediately evacuate the contaminated area, remian calm, keep warm. breath
lightly, avoid coughing
What are the main sources of domestic sewage in the collection system?- answer>>>
>>>household and commercial establishments
Why is it important to maintain a horizontal weir in a clarifier?- answer>>> >>>to prevent
short circuiting
What are mostly removed in the grit channel?- answer>>> >>>sand, eggshells, cinders,
and heavier particulate matter
How often should an anaerobic digester be fed?- answer>>> >>>several times a day
What is the health effect of carbon dioxide?- answer>>> >>>could lead to asphyxiation
Which of the following enters the headworks of a treatment plant?- answer>>>
>>>influent
What is the methane content in a properly operating anaerobic digester?- answer>>>
>>>65 to 70% by volume
What will the addition of chlorine gas do to the pH of wastewater?- answer>>>
>>>decrease the pH
What is the purpose of a Parshall Flume?- answer>>> >>>Measure the flow rate
What is the typical removal efficency of settleable solids in a primary clarifier?-
answer>>> >>>95 to 99%
Which of the follwing is true about pumoing scum from a primary clarifier?- answer>>>
>>>scum causes more piping problems than other substances pumped at a wastewater
treatment plant
Exam 1 verified with correct answers
What does the M in F/M ratio represent?- answer>>> >>>The mixed liquor volatile
suspended solids in the aeration tank
In general, how will warmer temp affect the settling rate of solids in a clarifer?-
answer>>> >>>Increase the settling rate
What could happen if the digester gas is mixed with air(85 to 95% by volume)?-
answer>>> >>>Cause an explosion
How will algae impact the chlorine demand in the pond effluent?- answer>>>
>>>increase the chlorine demand
Which of the following is true about a positive displacement pump?- answer>>> >>>it
must never be started with the discharge valve closed
What is true about the F/M ratio?- answer>>> >>>the volume of the secondary clarifier
is not needed to determine the f/m ratio
Which of the following is one of the basic rules of lab work?- answer>>> >>>never pipet
hazardous material with your mouth, even if the pipet has been sterialized
What is the recirculation ratio for a trickling filter?- answer>>> >>>Qr/Q
Which of the following is true about COD and BOD?- answer>>> >>>they are indirect
measurements of the organic content in the influent
What is the purpose of the grit channel?- answer>>> >>>remove heavy inorganic waste
Which of the following is true about the extended aeration process?- answer>>> >>>it
does not produce as much waste sludge as other processes
What is the correct formula for solids in raw wastewater?- answer>>> >>>Non
settleable solids + settleable solids = total suspended solids
What is freeboard in a waste stabilization pond?- answer>>> >>>the vertical distance
from normal water surface to the top of the levee
What is one of the requirements for a BOD test?- answer>>> >>>The BOD bottle
should be completely filled to the top
What should be scheduled every 3 months for a flamer arrester in an anaerobic
digester?- answer>>> >>>maintenance
, What is common practice in an activated sludge process?- answer>>> >>>recirculate
activated sludge
Prior to entering a permit-required confined space, what should you verify?- answer>>>
>>>a standby person should be located outside the entrance to the confined space,
while another person should be within sight or call of the standby person
What is a common way to determine the organic strength of wastes in the influent?-
answer>>> >>>test for the biochemical oxygen demand
What should you do if you are mildly exposed to chlorine gas?- answer>>>
>>>immediately evacuate the contaminated area, remian calm, keep warm. breath
lightly, avoid coughing
What are the main sources of domestic sewage in the collection system?- answer>>>
>>>household and commercial establishments
Why is it important to maintain a horizontal weir in a clarifier?- answer>>> >>>to prevent
short circuiting
What are mostly removed in the grit channel?- answer>>> >>>sand, eggshells, cinders,
and heavier particulate matter
How often should an anaerobic digester be fed?- answer>>> >>>several times a day
What is the health effect of carbon dioxide?- answer>>> >>>could lead to asphyxiation
Which of the following enters the headworks of a treatment plant?- answer>>>
>>>influent
What is the methane content in a properly operating anaerobic digester?- answer>>>
>>>65 to 70% by volume
What will the addition of chlorine gas do to the pH of wastewater?- answer>>>
>>>decrease the pH
What is the purpose of a Parshall Flume?- answer>>> >>>Measure the flow rate
What is the typical removal efficency of settleable solids in a primary clarifier?-
answer>>> >>>95 to 99%
Which of the follwing is true about pumoing scum from a primary clarifier?- answer>>>
>>>scum causes more piping problems than other substances pumped at a wastewater
treatment plant
