Wastewater practice exam UPDATED
ACTUAL Questions and CORRECT
Answers
What's the methane content in a properly operating a anerboic digestor? - CORRECT
ANSWER✔✔- 65-70% by volume
What will the addition of chlorine gas do to the pH of wastewatee - CORRECT
ANSWER✔✔- Decrease pH
What's the purpose of a parshall flume? - CORRECT ANSWER✔✔- Measure flowrate
What's the typical removal efficiency of set table solids in a primary clarifier ? - CORRECT
ANSWER✔✔- 95-99%
Which of the following is true about pumping scum from a primary clarifier ? - CORRECT
ANSWER✔✔- Scum causes piping issues
What causes thick billows of white sudsy foam in the aeration tank ? - CORRECT
ANSWER✔✔- MLSS is too low
What does the M in F/M ratio represents? - CORRECT ANSWER✔✔- Mixed liquour
violtile suspended solids in aeration tank
How will warmer temp affect the settling rate of solids in a clarifier? - CORRECT
ANSWER✔✔- Increase settling rate
What could happen if the digestor gas is mixed with air (85-95% by volume) - CORRECT
ANSWER✔✔- Cause an explosion
How will algae impact the chlorine demand in the pond effluents? - CORRECT
ANSWER✔✔- Doesnt affect chlorine demand
, What's true about a positive displacement pump? - CORRECT ANSWER✔✔- Must never b
started with ghe discharge valve closed
What is true about the F/M ratio - CORRECT ANSWER✔✔- Volume of the secondary
clarfier isnt needed tk determine the ratio
What's one of the rules of basic lab work ?... - CORRECT ANSWER✔✔- Never pipet
hazardous ,aterial with your mouth, even if the pipet has been sterilized
What's true about COD and BOD ? - CORRECT ANSWER✔✔- Indirect measurements kf
the organic content in the influent
What's the purpose of the girt channel? - CORRECT ANSWER✔✔- Remive heavy
inorganic wastes
Which of the following is true about the extended aeration process? - CORRECT
ANSWER✔✔- Doesnt prodcue as much waste sludge
What's the correct formula for solids I raw wastewater ? - CORRECT ANSWER✔✔- Non
settable solids + settable solids = total suspended solids
What is freeboard in . A waste stabilization pond ? - CORRECT ANSWER✔✔- Vettical
distance from normal water surface to the top of hte levee
What is one of the requirements for a BOD TEST - CORRECT ANSWER✔✔- The bod
bottle should be compltley filled to the top
What should be schedules every 3 months for a flamed arrested in a anaerobic digestor? -
CORRECT ANSWER✔✔- Maimtenacne
What is common practice in an activated sludge process ?? - CORRECT ANSWER✔✔-
Recicruclate acviated sludge
ACTUAL Questions and CORRECT
Answers
What's the methane content in a properly operating a anerboic digestor? - CORRECT
ANSWER✔✔- 65-70% by volume
What will the addition of chlorine gas do to the pH of wastewatee - CORRECT
ANSWER✔✔- Decrease pH
What's the purpose of a parshall flume? - CORRECT ANSWER✔✔- Measure flowrate
What's the typical removal efficiency of set table solids in a primary clarifier ? - CORRECT
ANSWER✔✔- 95-99%
Which of the following is true about pumping scum from a primary clarifier ? - CORRECT
ANSWER✔✔- Scum causes piping issues
What causes thick billows of white sudsy foam in the aeration tank ? - CORRECT
ANSWER✔✔- MLSS is too low
What does the M in F/M ratio represents? - CORRECT ANSWER✔✔- Mixed liquour
violtile suspended solids in aeration tank
How will warmer temp affect the settling rate of solids in a clarifier? - CORRECT
ANSWER✔✔- Increase settling rate
What could happen if the digestor gas is mixed with air (85-95% by volume) - CORRECT
ANSWER✔✔- Cause an explosion
How will algae impact the chlorine demand in the pond effluents? - CORRECT
ANSWER✔✔- Doesnt affect chlorine demand
, What's true about a positive displacement pump? - CORRECT ANSWER✔✔- Must never b
started with ghe discharge valve closed
What is true about the F/M ratio - CORRECT ANSWER✔✔- Volume of the secondary
clarfier isnt needed tk determine the ratio
What's one of the rules of basic lab work ?... - CORRECT ANSWER✔✔- Never pipet
hazardous ,aterial with your mouth, even if the pipet has been sterilized
What's true about COD and BOD ? - CORRECT ANSWER✔✔- Indirect measurements kf
the organic content in the influent
What's the purpose of the girt channel? - CORRECT ANSWER✔✔- Remive heavy
inorganic wastes
Which of the following is true about the extended aeration process? - CORRECT
ANSWER✔✔- Doesnt prodcue as much waste sludge
What's the correct formula for solids I raw wastewater ? - CORRECT ANSWER✔✔- Non
settable solids + settable solids = total suspended solids
What is freeboard in . A waste stabilization pond ? - CORRECT ANSWER✔✔- Vettical
distance from normal water surface to the top of hte levee
What is one of the requirements for a BOD TEST - CORRECT ANSWER✔✔- The bod
bottle should be compltley filled to the top
What should be schedules every 3 months for a flamed arrested in a anaerobic digestor? -
CORRECT ANSWER✔✔- Maimtenacne
What is common practice in an activated sludge process ?? - CORRECT ANSWER✔✔-
Recicruclate acviated sludge
