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Simulation-based Analysis of the Differences in the Removal Rate of Chlorides, Nitrates and Sulfates by Electrokinetic Desalination Treatments
Technical University of Denmark, Denmark.
Technical University of Denmark, Denmark.
Technical University of Denmark, Denmark.
Universidade Nova de Lisboa, Portugal.
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2012 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 89, no 1, p. 436-444Article in journal (Refereed) Published
Resource type
Text
Abstract [en]

Due to their abundance in the natural environment, chloride, nitrate and sulfate salts are considered the main responsible for the salt-induced decay processes in building materials and sculptures. Electro-desalination techniques, enhanced with carbonated clay buffer poultice placed between the surface of the stone and the electrodes, have been successfully applied for the prevention of salt-induced deterioration problems of masonry and other construction materials. However, it has been experimentally observed that, in this type of treatments, the removal rate of sulfates is considerably slower than<br/>chlorides and nitrates.

A physicochemical model for electrochemically-induced reactive-transport processes is described and used for a theoretical analysis of the influence of the chemical interactions on the removal rate of the target ions. Simulations for the electro-desalination of a brick sample contaminated with a combination of these target ions are shown. Results from simulations show that the lower removal efficiency of sulfates is related to the precipitation of gypsum inside the porous body. Modifications of the existing technique are suggested based on the simulation results.

Place, publisher, year, edition, pages
2012. Vol. 89, no 1, p. 436-444
Keywords [en]
Electrokinetic desalination, Salt-decay, Reactive-transport modeling, Poisson-Nernst-Planck system
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
URN: urn:nbn:se:lnu:diva-48707DOI: 10.1016/j.electacta.2012.11.087OAI: oai:DiVA.org:lnu-48707DiVA, id: diva2:893431
Available from: 2016-01-12 Created: 2016-01-12 Last updated: 2017-11-30Bibliographically approved

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Johannesson, Björn

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