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Texas Basic Waste Water Operations Ch#08 Activated Sludge Process - Statistics
General Stats
- This quiz has been taken 49 times
- The average score is 10 of 18
Answer Stats
| Question | Answer | % Correct |
|---|---|---|
| Mixed liquor is the mixture of raw wastewater and microorganisms. | True | 82%
|
| The primary purpose of returning sludge is to have enough ________ in the aerator to match the food supply | microorganisms | 73%
|
| If the ________ loading on the plant is high, DO levels should be increased. | organic | 73%
|
| The five components of the activated sludge process are the oxygen supply system, aeration tank, clarifier, return sludge system, and waste sludge system. | True | 73%
|
| In the clarifier, the biological solids separate by gravity settling. | True | 73%
|
| Wasting removes excess solids, inert solids, and old or dead solids from the system. | True | 73%
|
| Process control parameters include dissolved oxygen, quantity and quality of solids, return rate, and wasting rate. | True | 73%
|
| The settled biological solids accumulate in the clarifier, then are always wasted from the process. | False | 64%
|
| ________ are the smallest, most numerous, and most important of the activated sludge microorganisms. | Bacteria | 55%
|
| 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 | 55%
|
| The ________ modification has no return sludge and the aeration tank is used as the clarifier. | sequential batch reactor | 55%
|
| Select the correctly labeled diagram below. |  | 45%
|
| 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 | 45%
|
| 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 | 45%
|
| Normally, DO should be kept between 20 and 40 mg/L. | False | 45%
|
| ________ settles gently and uniformly, compacts slowly, and has sharp edges like a sponge. | Quality sludge | 45%
|
| A simple method indicating when to waste is the ________. | 30-minute settling test | 36%
|
| At least 1 mg/L DO should be kept in the aeration basin to maintain the health of the anaerobic microorganisms. | False | 36%
|
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