Effect of measuring geometries and of exocellular polymeric substances on the rheological behaviour of sewage sludge.
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| Title: | Effect of measuring geometries and of exocellular polymeric substances on the rheological behaviour of sewage sludge. |
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| Authors: | Mori, M.1, Isaac, J.1, Seyssiecq, I.1 isabelle.seyssiecq@univ-cezanne.fr, Roche, N.1 |
| Source: | Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers Part A. Jun2008, Vol. 86 Issue 6, p554-559. 6p. 2 Charts, 4 Graphs. |
| Subjects: | Rheology, Characterization of sewage sludge, Geometry, Viscoplasticity, Shear (Mechanics), Polymers |
| Abstract: | In biological Wastewater Treatment Plants operated with the activated sludge process, the resulting suspension is a very complex non-Newtonian material. A better understanding of sludge flows could lead to improvements in the process itself. For the purpose of sludge characterisation, rheology is a well-known relevant investigation tool. In this study, rheological measurements have been carried out on sewage sludge with different total suspended solid (TSS) contents ranging from 4 to 43 g/L. Three measuring geometries, a concentric cylinders (CC) system, a double concentric cylinders pCC2) system and a helical ribbon impeller (HRI) have first been compared in their ability to accurately characterise the rheological properties of sludge suspensions. The Herschel-Buikley model has then been chosen to represent the flow curves. The evolution of the model parameters drawn as a function of TSS content for CC and HRI systems showed that, with both geometries, viscoplastic (VP) and shear-thinning (ST) behaviours increased with increasing TSS. Finally, the role of exocellular polymers in terms of adsorbed exopolysaccharides (EPS) concentration has also been investigated. As the sludge ages, the results showed that a decrease in EPS concentration induced a decrease in both VP and ST properties. [ABSTRACT FROM AUTHOR] |
| Copyright of Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers Part A is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 33461240 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Effect of measuring geometries and of exocellular polymeric substances on the rheological behaviour of sewage sludge. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Mori%2C+M%2E%22">Mori, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Isaac%2C+J%2E%22">Isaac, J.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Seyssiecq%2C+I%2E%22">Seyssiecq, I.</searchLink><relatesTo>1</relatesTo><i> isabelle.seyssiecq@univ-cezanne.fr</i><br /><searchLink fieldCode="AR" term="%22Roche%2C+N%2E%22">Roche, N.</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Chemical+Engineering+Research+%26+Design%3A+Transactions+of+the+Institution+of+Chemical+Engineers+Part+A%22">Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers Part A</searchLink>. Jun2008, Vol. 86 Issue 6, p554-559. 6p. 2 Charts, 4 Graphs. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Rheology%22">Rheology</searchLink><br /><searchLink fieldCode="DE" term="%22Characterization+of+sewage+sludge%22">Characterization of sewage sludge</searchLink><br /><searchLink fieldCode="DE" term="%22Geometry%22">Geometry</searchLink><br /><searchLink fieldCode="DE" term="%22Viscoplasticity%22">Viscoplasticity</searchLink><br /><searchLink fieldCode="DE" term="%22Shear+%28Mechanics%29%22">Shear (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Polymers%22">Polymers</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: In biological Wastewater Treatment Plants operated with the activated sludge process, the resulting suspension is a very complex non-Newtonian material. A better understanding of sludge flows could lead to improvements in the process itself. For the purpose of sludge characterisation, rheology is a well-known relevant investigation tool. In this study, rheological measurements have been carried out on sewage sludge with different total suspended solid (TSS) contents ranging from 4 to 43 g/L. Three measuring geometries, a concentric cylinders (CC) system, a double concentric cylinders pCC2) system and a helical ribbon impeller (HRI) have first been compared in their ability to accurately characterise the rheological properties of sludge suspensions. The Herschel-Buikley model has then been chosen to represent the flow curves. The evolution of the model parameters drawn as a function of TSS content for CC and HRI systems showed that, with both geometries, viscoplastic (VP) and shear-thinning (ST) behaviours increased with increasing TSS. Finally, the role of exocellular polymers in terms of adsorbed exopolysaccharides (EPS) concentration has also been investigated. As the sludge ages, the results showed that a decrease in EPS concentration induced a decrease in both VP and ST properties. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers Part A is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.cherd.2007.10.013 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 6 StartPage: 554 Subjects: – SubjectFull: Rheology Type: general – SubjectFull: Characterization of sewage sludge Type: general – SubjectFull: Geometry Type: general – SubjectFull: Viscoplasticity Type: general – SubjectFull: Shear (Mechanics) Type: general – SubjectFull: Polymers Type: general Titles: – TitleFull: Effect of measuring geometries and of exocellular polymeric substances on the rheological behaviour of sewage sludge. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Mori, M. – PersonEntity: Name: NameFull: Isaac, J. – PersonEntity: Name: NameFull: Seyssiecq, I. – PersonEntity: Name: NameFull: Roche, N. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: Jun2008 Type: published Y: 2008 Identifiers: – Type: issn-print Value: 02638762 Numbering: – Type: volume Value: 86 – Type: issue Value: 6 Titles: – TitleFull: Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers Part A Type: main |
| ResultId | 1 |
