Cit:Ottosen.etal:2014
| Autor | Ottosen, L.M. and Skibsted, G. and Præstholm, T. |
| Jahr | 2014 |
| Titel | Electrodesalination of sandstones with irregular shapes and uneven distribution of salts |
| Bibtex | |
| DOI | 10.5165/hawk-hhg/263 |
| Link | Datei:SWBSS2014 Ottosen etal.pdf |
| Bemerkungen | In: De Clercq, Hilde (editor): Proceedings of SWBSS 2014. Third International Conference on Salt Weathering of Buildings and Stone Sculptures Royal Institute for Cultural Heritage, Brussels, Belgium, 14-16 October 2036, S. 405-420 |
Eintrag in der Bibliographie
| [Ottosen.etal:2014] | Ottosen, L.M.; Skibsted, G.; Præstholm, T. (2014): Electrodesalination of sandstones with irregular shapes and uneven distribution of salts. In: Hilde De Clercq (Hrsg.): Proceedings of SWBSS 2014 3rd International Conference on Salt Weathering of Buildings and Stone Sculptures,KIK-IRPA, Royal Institute for Cultural Heritage Brussels 405-420, 10.5165/hawk-hhg/263. |   |
Keywords[Bearbeiten]
electrodesalination, sandstone, electrode placement
Abstract[Bearbeiten]
Electrochemical desalination of stone is based on application of an electric potential gradient. In case the electrodes are placed in a poultice, which buffer the acid from oxidation of water at the anode, the methods has shown very effective. Most investigations have been carried out in laboratory scale on stones with an even salt distribution. This investigation was designed to answer different questions arising if the method is to be applied to sculptures and monuments with an uneven salt distribution and irregular shapes. Laboratory experiments were made with stones samples from a historic warehouse. The sampling was in connection to renovation. Before the renovation an on-site experiment was made as a part of the investigation. The initial concentration in the stone segments for the different laboratory experiments varied reflecting the inhomogeneous distribution in the wall. Whether the electrodes were placed on the same side of the stone or on two opposite sides did not influence the removal rate of Cl- and NO3. A stone part, which was not placed directly between the electrodes, was desalinated, but with a slower rate than the other parts. Two stone parts were isolated from each other during the desalination, and the current mainly passed through the part with high salt concentration. The on-site experiment was successful. Chloride was removed to a very low level in all depth of the investigation (10 cm) and from cathode end to anode end, though the desalination had not finished as the concentration was still little too high in the anode end. All together 131 g Cl- was removed during 5½ month. All results showed that the method had potential for desalination of monuments with irregular surfaces and salt distribution.