Wastewater Grade 2 Exam, Latest
Expert Premium Update(2025-2026),
Brand New Exam Questions With
100% Correct Answers, All Graded A+,
Guaranteed Success.
what is the methane content in a properly operating anaerobic digester? - ANSWER-
✅✅65 to 70% by volume
what is the purpose of a parshall flume - ANSWER-✅✅Measure flow rate
what is the typical removal efficiency of settleable solids in a primary clarifier? -
ANSWER-✅✅95 to 99%
what might cause thick billows of white sudsy foam in the aeration tank? - ANSWER-
✅✅MLSS is too low
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 temperature affect the settling rate of solids in a
clarifier? - ANSWER-✅✅Increase the settling rate
Which of the following is true about a positive displacement pump? - ANSWER-
✅✅It must never be started with the discharge valve closed
which of the following is one of the basic rules of laboratory work? - ANSWER-
✅✅never pipet hazardous material with your mouth, even if the pipet has been
sterilized
what is the purpose of the grit channel? - ANSWER-✅✅Remove heavy inorganic
wastes
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
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, remain clam, keep warm,
breathe lightly, and avoid coughing
what are the main sources of domestic sewage in the collection system? - ANSWER-
✅✅households and commercial establishments
what are mostly removed in the grit channel? - ANSWER-✅✅sand, eggshells,
cinders, and heavier particulate matter
which gas diminished your sense of smell? - ANSWER-✅✅hydrogen sulfide
which of the following enters the headworks of a treatment plant? - ANSWER-
✅✅influent
what is the equivalent of 1 mg/L? - ANSWER-✅✅1 ppm
what is equivalent to organic solids? - ANSWER-✅✅volatile solids
Expert Premium Update(2025-2026),
Brand New Exam Questions With
100% Correct Answers, All Graded A+,
Guaranteed Success.
what is the methane content in a properly operating anaerobic digester? - ANSWER-
✅✅65 to 70% by volume
what is the purpose of a parshall flume - ANSWER-✅✅Measure flow rate
what is the typical removal efficiency of settleable solids in a primary clarifier? -
ANSWER-✅✅95 to 99%
what might cause thick billows of white sudsy foam in the aeration tank? - ANSWER-
✅✅MLSS is too low
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 temperature affect the settling rate of solids in a
clarifier? - ANSWER-✅✅Increase the settling rate
Which of the following is true about a positive displacement pump? - ANSWER-
✅✅It must never be started with the discharge valve closed
which of the following is one of the basic rules of laboratory work? - ANSWER-
✅✅never pipet hazardous material with your mouth, even if the pipet has been
sterilized
what is the purpose of the grit channel? - ANSWER-✅✅Remove heavy inorganic
wastes
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
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, remain clam, keep warm,
breathe lightly, and avoid coughing
what are the main sources of domestic sewage in the collection system? - ANSWER-
✅✅households and commercial establishments
what are mostly removed in the grit channel? - ANSWER-✅✅sand, eggshells,
cinders, and heavier particulate matter
which gas diminished your sense of smell? - ANSWER-✅✅hydrogen sulfide
which of the following enters the headworks of a treatment plant? - ANSWER-
✅✅influent
what is the equivalent of 1 mg/L? - ANSWER-✅✅1 ppm
what is equivalent to organic solids? - ANSWER-✅✅volatile solids
