A novel process entitled “Sediments Remediation Phase Transition Extraction” (SR-PTE) is being developed for a simultaneous removal of both heavy metals and organic pollutants from contaminated sediments or sludge. The process uses partially miscible solvent mixtures, where one of the components is water. By heating the mixture above a certain temperature, a single phase is formed. This allows the organic solvent, containing an appropriate chelating agent, to penetrate the wetted sediment voids and efficiently extract simultaneously the organic and heavy metal pollutants. The phase separation, occurring during the cooling stage, is fast and allows the pollutants to propagate and concentrate in the lighter organic phase, leaving the sediments and the lower aqueous phase practically clean. The SR-PTE technology was tested on authentically polluted river sediments and on heavily contaminated sludge from a waste-water treatment plant. The extraction efficiency was found to improve by the phase transition cycle induced by temperature variation (about twice than that obtained when the extraction was carried out isothermally). Additionally, with the induced phase transition, the formation of stable emulsions is prevented albeit the presence of natural surfactants in the treated media. The process was tested on lab scale and bench-scale reactor. No significant effects of the process up-scaling from lab to bench scale were observed.
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2010 14th International Heat Transfer Conference
August 8–13, 2010
Washington, DC, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4939-2
PROCEEDINGS PAPER
Phase Transition of Partially Miscible Solvents Induced by Heating Cycles: Application for the Remediation of Contaminated Sediments and Sludge
Amos Ullmann
,
Amos Ullmann
Tel-Aviv University, Tel Aviv, Israel
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Neima Brauner
,
Neima Brauner
Tel-Aviv University, Tel Aviv, Israel
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Guy Dahan
,
Guy Dahan
Tel-Aviv University, Tel Aviv, Israel
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Tal Golan
,
Tal Golan
The Hebrew University of Jerusalem, Rehovot, Israel
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Zvi Ludmer
Zvi Ludmer
The Hebrew University of Jerusalem, Rehovot, Israel
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Amos Ullmann
Tel-Aviv University, Tel Aviv, Israel
Neima Brauner
Tel-Aviv University, Tel Aviv, Israel
Guy Dahan
Tel-Aviv University, Tel Aviv, Israel
Tal Golan
The Hebrew University of Jerusalem, Rehovot, Israel
Zvi Ludmer
The Hebrew University of Jerusalem, Rehovot, Israel
Paper No:
IHTC14-22856, pp. 643-651; 9 pages
Published Online:
March 1, 2011
Citation
Ullmann, A, Brauner, N, Dahan, G, Golan, T, & Ludmer, Z. "Phase Transition of Partially Miscible Solvents Induced by Heating Cycles: Application for the Remediation of Contaminated Sediments and Sludge." Proceedings of the 2010 14th International Heat Transfer Conference. 2010 14th International Heat Transfer Conference, Volume 4. Washington, DC, USA. August 8–13, 2010. pp. 643-651. ASME. https://doi.org/10.1115/IHTC14-22856
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