Wastewater grade 2 Exam Questions And Answers 100% Pass.
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Course
Waste Management
Institution
Waste Management
ization pond? - answerthe vertical distance from normal
water surface to the top of the levee
prior to entering a permit-required confined space, what should you verify? - answera standby
person should be located outside the entrance to the confined space, while another person should
be within ...
Wastewater grade 2 Exam Questions And
Answers 100% Pass.
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
what should be done if a largge amount of organic matter is found in the grit channel? -
answer✔increase the velocity of wastewater
what is the difference between the sludge from a primary clarifier and secondary clarifier? -
answer✔primary sludge is denser than secondary sludge
which process includes a blower? - answer✔activated sludge
how does an activated sludge system remove waste from wastewater? - answer✔biological
treatment
which of the following best describes per-chlorination? - answer✔addition of chlorine to
wastewater at the entrance to the plant, and used for odor control, BOD reduction, grease
removal, and aid sedimentation
when would you expect reduced algae population and less oxygen released into a pond? -
answer✔fall and winter, when the weather is cool and sunlight is reduced
what is the first steps of lockout/tagout procedure? - answer✔notify all affected employees that a
lockout or tagged system is going to be used and the reason why
what type of process is the activated sludge system? - answer✔aerobic
what might cause sludge to rise in a clarifier? - answer✔gasification from aging sludge
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