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Statistics for Texas Basic Waste Water Operations Ch#08 Activated Sludge Process

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General Stats

  • This quiz has been taken 9 times
  • The average score is 12 of 18

Answer Stats

QuestionAnswer% Correct
The ________ modification of the activated sludge process has no primary clarifier, no digester, 24-hour aeration time, a low F/M ratio, and complete nitrification.extended aeration
83%
The aeration tank should be observed weekly for a uniform aeration pattern, low amount of light colored foam, mild, earthy odor, and medium brown color.False
83%
________ settles gently and uniformly, compacts slowly, and has sharp edges like a sponge.Quality sludge
83%
The ________ modification has no return sludge and the aeration tank is used as the clarifier.sequential batch reactor
83%
The five components of the activated sludge process are the oxygen supply system, aeration tank, clarifier, return sludge system, and waste sludge system.True
83%
Wasting removes excess solids, inert solids, and old or dead solids from the system.True
83%
Process control parameters include dissolved oxygen, quantity and quality of solids, return rate, and wasting rate.True
83%
A simple method indicating when to waste is the ________.30-minute settling test
67%
The settled biological solids accumulate in the clarifier, then are always wasted from the process.False
67%
The primary purpose of returning sludge is to have enough ________ in the aerator to match the food supplymicroorganisms
67%
In the clarifier, the biological solids separate by gravity settling.True
67%
Mixed liquor is the mixture of raw wastewater and microorganisms.True
67%
Select the correctly labeled diagram below.
50%
________ are the smallest, most numerous, and most important of the activated sludge microorganisms.Bacteria
50%
Normally, DO should be kept between 20 and 40 mg/L.False
50%
At least 1 mg/L DO should be kept in the aeration basin to maintain the health of the anaerobic microorganisms.False
50%
If the ________ loading on the plant is high, DO levels should be increased.organic
50%
The clarifier should have very little scum, a sludge blanket in the bottom 1/4 of the clarifier depth, uniform weir flow, rising solids, and turbid supernatant.False
33%

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