Wastewater Grade 2 Exam (2026/2027) Questions
and Verified Answers, 100% Guarantee Pass
what is the methane content in a properly operating anaerobic digester? - CORRECT ANSWER -
65 to 70% by volume
what is the purpose of a parshall flume - CORRECT ANSWER -Measure flow rate
what is the typical removal efficiency of settleable solids in a primary clarifier? - CORRECT
ANSWER -95 to 99%
what might cause thick billows of white sudsy foam in the aeration tank? - CORRECT
ANSWER -MLSS is too low
what does the "M" in F/M ratio represent? - CORRECT ANSWER -The mixed liquor volatile
suspended solids in the aeration tank
In general, how will warmer temperature affect the settling rate of solids in a clarifier? -
CORRECT ANSWER -Increase the settling rate
Which of the following is true about a positive displacement pump? - CORRECT ANSWER -It
must never be started with the discharge valve closed
which of the following is one of the basic rules of laboratory work? - CORRECT ANSWER -
never pipet hazardous material with your mouth, even if the pipet has been sterilized
what is the purpose of the grit channel? - CORRECT ANSWER -Remove heavy inorganic
wastes
, what is the correct formula for solids in raw wastewater? - CORRECT ANSWER -non-settleable
solids + settleable solids = total suspended solids
What is freeboard in a waste stabilization pond? - CORRECT ANSWER -the vertical distance
from normal water surface to the top of the levee
prior to entering a permit-required confined space, what should you verify? - CORRECT
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? - CORRECT
ANSWER -test for the biochemical oxygen demand
what should you do if you are mildly exposed to chlorine gas? - CORRECT ANSWER -
immediately evacuate the contaminated area, remain clam, keep warm, breathe lightly, and avoid
coughing
what are the main sources of domestic sewage in the collection system? - CORRECT ANSWER
-households and commercial establishments
what are mostly removed in the grit channel? - CORRECT ANSWER -sand, eggshells, cinders,
and heavier particulate matter
which gas diminished your sense of smell? - CORRECT ANSWER -hydrogen sulfide
which of the following enters the headworks of a treatment plant? - CORRECT ANSWER -
influent
what is the equivalent of 1 mg/L? - CORRECT ANSWER -1 ppm
and Verified Answers, 100% Guarantee Pass
what is the methane content in a properly operating anaerobic digester? - CORRECT ANSWER -
65 to 70% by volume
what is the purpose of a parshall flume - CORRECT ANSWER -Measure flow rate
what is the typical removal efficiency of settleable solids in a primary clarifier? - CORRECT
ANSWER -95 to 99%
what might cause thick billows of white sudsy foam in the aeration tank? - CORRECT
ANSWER -MLSS is too low
what does the "M" in F/M ratio represent? - CORRECT ANSWER -The mixed liquor volatile
suspended solids in the aeration tank
In general, how will warmer temperature affect the settling rate of solids in a clarifier? -
CORRECT ANSWER -Increase the settling rate
Which of the following is true about a positive displacement pump? - CORRECT ANSWER -It
must never be started with the discharge valve closed
which of the following is one of the basic rules of laboratory work? - CORRECT ANSWER -
never pipet hazardous material with your mouth, even if the pipet has been sterilized
what is the purpose of the grit channel? - CORRECT ANSWER -Remove heavy inorganic
wastes
, what is the correct formula for solids in raw wastewater? - CORRECT ANSWER -non-settleable
solids + settleable solids = total suspended solids
What is freeboard in a waste stabilization pond? - CORRECT ANSWER -the vertical distance
from normal water surface to the top of the levee
prior to entering a permit-required confined space, what should you verify? - CORRECT
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? - CORRECT
ANSWER -test for the biochemical oxygen demand
what should you do if you are mildly exposed to chlorine gas? - CORRECT ANSWER -
immediately evacuate the contaminated area, remain clam, keep warm, breathe lightly, and avoid
coughing
what are the main sources of domestic sewage in the collection system? - CORRECT ANSWER
-households and commercial establishments
what are mostly removed in the grit channel? - CORRECT ANSWER -sand, eggshells, cinders,
and heavier particulate matter
which gas diminished your sense of smell? - CORRECT ANSWER -hydrogen sulfide
which of the following enters the headworks of a treatment plant? - CORRECT ANSWER -
influent
what is the equivalent of 1 mg/L? - CORRECT ANSWER -1 ppm
