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Sludge dewatering with cyclodextrins.
- Source :
-
Water research [Water Res] 2007 Mar; Vol. 41 (6), pp. 1201-6. Date of Electronic Publication: 2007 Jan 30. - Publication Year :
- 2007
-
Abstract
- Cyclodextrins (CDs) increase the cake solids and drainage rate of belt-pressed biological or primary sludge when added to the sludge slurry along with conventional conditioning chemicals. These benefits are obtained at very low CD dosage. A 2.8 percentage point increase in cake solids was obtained in a full-scale trial with mixed primary and biological sludge from a paper mill. CDs also decrease the specific resistance to filtration and increase the capture rate of solids during belt pressing. Mechanistic studies showed that CDs increase the surface tension of c-PAM polymers in water and reduce the turbidity, indicating that they are able to aggregate the charged polymers, and, by inference, sludge particles treated with the polymer. A mechanism is proposed where CDs reduce excessively charged regions of the polymer-treated surface of the sludge, thereby facilitating its flocculation.
Details
- Language :
- English
- ISSN :
- 0043-1354
- Volume :
- 41
- Issue :
- 6
- Database :
- MEDLINE
- Journal :
- Water research
- Publication Type :
- Academic Journal
- Accession number :
- 17267007
- Full Text :
- https://doi.org/10.1016/j.watres.2006.12.011