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Texas Waste Water Treatment Ch#05 Preliminary & Primary Treatment - Statistics
General Stats
- This quiz has been taken 128 times
- The average score is 11 of 15
Answer Stats
| Question | Answer | % Correct |
|---|---|---|
| Conditions influencing settling of solids include which of the following? | All of the above | 100%
|
| Grit should be removed to prevent which of the following? | All of the above | 83%
|
| As its temperature increases, water becomes ________. | less dense | 83%
|
| When should sludge be pumped from a primary clarifier? | None of the above | 83%
|
| A primary clarifier should remove most of the ________. | settleable solids | 83%
|
| Raw sludge should be pumped to a digester ________. | slowly when it is adequately thickened | 83%
|
| Too high a velocity in a grit chamber can result in ________. | excess grit in primary clarifier | 75%
|
| One of the benefits of pre-aeration is ________. | gas and grease removal | 75%
|
| Flow equalization is used to ________. | reduce excessive flows or organic loads | 75%
|
| Sludge from a primary clarifier should have a moisture content of ________. | 94% to 96% | 67%
|
| Short-circuiting in a clarifier is ________. | a flow problem | 67%
|
| Why does grit need to be washed? | Organic matter clings to it. | 67%
|
| By performing Imhoff cone tests on the clarifier inlet and outlet, the operator can determine which of the following? | The efficiency AND depth of sludge in the clarifier | 67%
|
| Grease may be removed before sedimentation by which of the following? | All of the above | 58%
|
| The upper compartment of an Imhoff tank serves as the ________ and the lower compartment provides space for ________. | clarifier/digester | 58%
|
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