In a primary clarifier, the expected performance for removing settleable solids is 90-
95% removal. What about the removal of suspended solids?
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50%
Corrosion in manholes is caused by?
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hydrogen sulfide gas
Why are check valves important?
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They prevent backflow. Without them, water could freely travel from the
discharge line back into the tank/wet well
What is the most widely used dechlorination agent in a conventional chlorine gas
plant?
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Sulfur Dioxide
Over the last week, your mixed liquor color has changed from brown, to dark brown,
to black. What adjustment should you make?
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Increase WAS
At what temperature does the BOD sample need to be preserved at?
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At or below 6 degrees Celsius
Best type of flow measuring device in a closed channel to measure solids?
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Magnetic flowmeter is best. Then venturi meter.
What is the hydraulic detention time of a rectangular tank with a length of 26 ft, a
width of 22 ft, and a height of 19 ft when the influent flow is 1.3 MGD?
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1.5 hours
Solution:
26 x 22 x 19 x 7.48 x 24
-------------------------- = 1.50
1,300,000
Your ideal F:M ratio is 0.25 - 0.35. What action do you take if your measured F:M ratio
is too LOW?
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Increase the Waste rate.
If discharge from a positive displacement pump is consistently changing between
high and low volumes of discharge what is the most likely cause?
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95% removal. What about the removal of suspended solids?
Give this one a try later!
50%
Corrosion in manholes is caused by?
Give this one a try later!
hydrogen sulfide gas
Why are check valves important?
,Give this one a try later!
They prevent backflow. Without them, water could freely travel from the
discharge line back into the tank/wet well
What is the most widely used dechlorination agent in a conventional chlorine gas
plant?
Give this one a try later!
Sulfur Dioxide
Over the last week, your mixed liquor color has changed from brown, to dark brown,
to black. What adjustment should you make?
Give this one a try later!
Increase WAS
At what temperature does the BOD sample need to be preserved at?
Give this one a try later!
At or below 6 degrees Celsius
Best type of flow measuring device in a closed channel to measure solids?
, Give this one a try later!
Magnetic flowmeter is best. Then venturi meter.
What is the hydraulic detention time of a rectangular tank with a length of 26 ft, a
width of 22 ft, and a height of 19 ft when the influent flow is 1.3 MGD?
Give this one a try later!
1.5 hours
Solution:
26 x 22 x 19 x 7.48 x 24
-------------------------- = 1.50
1,300,000
Your ideal F:M ratio is 0.25 - 0.35. What action do you take if your measured F:M ratio
is too LOW?
Give this one a try later!
Increase the Waste rate.
If discharge from a positive displacement pump is consistently changing between
high and low volumes of discharge what is the most likely cause?
Give this one a try later!
