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Texas Waste Water Treatment #11 Sludge Digestion Dewatering & Disposal - Statistics
General Stats
- This quiz has been taken 63 times
- The average score is 12 of 20
Answer Stats
| Question | Answer | % Correct |
|---|---|---|
| The purpose of sludge digestion is to _________. | stabilize the organic matter | 100%
|
| Which of the following is a factor that influences the operation of sludge thickeners? | All of the above | 90%
|
| Which of the following processes are used to dewater sewage sludge? | All of the above | 90%
|
| The proper pH for anaerobically digested sludge will ________. | be from 6.8–7.4 | 80%
|
| Anaerobic digester mixing methods include which of the following? | Gas AND mechanical mixing | 80%
|
| A cause of poor quality supernatant liquor could be ________. | digester overload | 70%
|
| Primary volatile acids are converted by methane bacteria to which of the following? | Methane AND carbon dioxide | 70%
|
| Scum in a digester is mostly ________. | undigested grease | 70%
|
| A minimum value of ________ of oxygen should be maintained in the aerobic digester at all times. | 1.0 mg/L | 60%
|
| The depth of sludge drawn to a drying bed should be ________. | about 9 in. | 60%
|
| Sludge types may include the following: ________. | activated | 60%
|
| Digester trouble signs include which of the following? | Increase in pH AND Decrease in volatile solids reduction | 60%
|
| Digester gas should contain which of the following? | 65%–75% methane | 50%
|
| Sludge drying time is affected most by which of the following? | Degree of digestion | 50%
|
| The moisture content of sludge transported to a municipal landfill should be less than ________. | 80% | 40%
|
| Since the majority of ________ digesters are open tanks, digester liquid temperatures are dependent on weather conditions and can fluctuate extensively. | aerobic | 40%
|
| Digester gas may be used to ________. | heat digesters | 40%
|
| The most expensive method for the final disposal of sludge is ________. | incineration | 40%
|
| The digester temperature should not change more than ________. | l°C per day | 40%
|
| Sludge conditioning is the process of removing water by thickening or by adding polymers or ________ materials to improve the loading rate. | inorganic | 0%
|
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