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Air gap membrane distillation for hypersaline brine concentration: Operational analysis of a full-scale module–New strategies for wetting mitigation

  • Membrane distillation (MD) is a thermal separation process which possesses a hydrophobic, microporous membrane as vapor space. A high potential application for MD is the concentration of hypersaline brines, such as e.g. reverse osmosis retentate or other saline effluents to be concentrated to a near saturation level with a Zero Liquid Discharge process chain. In order to further commercializeMembrane distillation (MD) is a thermal separation process which possesses a hydrophobic, microporous membrane as vapor space. A high potential application for MD is the concentration of hypersaline brines, such as e.g. reverse osmosis retentate or other saline effluents to be concentrated to a near saturation level with a Zero Liquid Discharge process chain. In order to further commercialize MD for these target applications, adapted MD module designs are required along with strategies for the mitigation of membrane wetting phenomena. This work presents the experimental results of pilot operation with an adapted Air Gap Membrane Distillation (AGMD) module for hypersaline brine concentration within a range of 0–240 g NaCl /kg solution. Key performance indicators such as flux, GOR and thermal efficiency are analyzed. A new strategy for wetting mitigation by active draining of the air gap channel by low pressure air blowing is tested and analyzed. Only small reductions in flux and GOR of 1.2% and 4.1% respectively, are caused by air sparging into the air gap channel. Wetting phenomena are significantly reduced by avoiding stagnant distillate in the air gap making the air blower a seemingly worth- while additional system component.show moreshow less

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Metadaten
Author:Rebecca Schwantes, Lorenz Bauer, Kirtiraj Chavan, Dennis Dücker, Clemens Felsmann, Jens PfafferottGND
Publisher:Elsevier
Year of Publication:2018
Language:English
Tag:Membrane distillation Wetting mitigation Brine concentration Draw solution recovery
Parent Title (English):Desalination
Issue:444
First Page:13
Last Page:25
Document Type:Article (reviewed)
Institutes:Bibliografie
Acces Right:Zugriffsbeschränkt
Release Date:2018/12/20
Licence (German):License LogoEs gilt das UrhG
DOI:https://doi.org/10.1016/j.desal.2018.06.012