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Questions and Answers
What is the purpose of sludge thickening prior to the sludge stabilization process?
What is the purpose of sludge thickening prior to the sludge stabilization process?
- To increase the ability to mix and pump the sludge
- To reduce the volume of sludge (correct)
- To improve digester performance
- To decrease the solids content of the sludge
What is the upper limit of solids concentration that can be effectively treated in digesters?
What is the upper limit of solids concentration that can be effectively treated in digesters?
- 10% - 12%
- 7% - 9% (correct)
- 5% - 7%
- 3% - 5%
If a 5000 mg/l (0.5%) sludge is thickened to 5% solids concentration, by how much will it reduce the volume of sludge?
If a 5000 mg/l (0.5%) sludge is thickened to 5% solids concentration, by how much will it reduce the volume of sludge?
- 50%
- 70%
- 90% (correct)
- 60%
Which type of sludge is more suitable for a gravity thickener?
Which type of sludge is more suitable for a gravity thickener?
What are the principles of gravity thickener operations based on?
What are the principles of gravity thickener operations based on?
What are the advantages of sludge thickening?
What are the advantages of sludge thickening?
What is the purpose of the picket fence-like mechanism attached to the bottom sludge rake arms?
What is the purpose of the picket fence-like mechanism attached to the bottom sludge rake arms?
Why are the sludge rake arms rotated at a very slow speed in a gravity thickener?
Why are the sludge rake arms rotated at a very slow speed in a gravity thickener?
What is the purpose of the scum removal mechanism in a gravity thickener?
What is the purpose of the scum removal mechanism in a gravity thickener?
What does SVR (Sludge Volume Ratio) provide a means of regulating in a gravity thickener?
What does SVR (Sludge Volume Ratio) provide a means of regulating in a gravity thickener?
Why is primary sludge not generally suitable for thickening using Dissolved Air Floatation Thickener (DAFT)?
Why is primary sludge not generally suitable for thickening using Dissolved Air Floatation Thickener (DAFT)?
What is the typical range for Sludge Volume Ratios (SVRs) for primary sludge in a gravity thickener?
What is the typical range for Sludge Volume Ratios (SVRs) for primary sludge in a gravity thickener?
What is the primary principle difference between a gravity thickener and a Dissolved Air Floatation Thickener (DAFT)?
What is the primary principle difference between a gravity thickener and a Dissolved Air Floatation Thickener (DAFT)?
What is the typical purpose of utilizing chemical additives in a gravity thickener?
What is the typical purpose of utilizing chemical additives in a gravity thickener?
What is the typical solids loading rate of a gravity thickener used for thickening primary sludge?
What is the typical solids loading rate of a gravity thickener used for thickening primary sludge?
What is the typical purpose of maintaining the sludge blanket depth in a gravity thickener?
What is the typical purpose of maintaining the sludge blanket depth in a gravity thickener?
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