Academic thesis
| Malaika Scheer: | Potentials and Limits of the application of sulphate reducing bacteria on sandstone surfaces with gypsum crusts. | back |
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| Abstract: | The thesis paper at hand deals with the elimination of gypsum crusts on sandstone surfaces by the use of sulphate reducing bacteria. Within the project, the required quantity of two bacteria’s breeds was successfully grown. Miscellaneous pre-experiments could improve the basic conditions decisively. Different techniques of application, both the use of synthetic foils and the use of Carbopol gel were tested and evaluated as adequate for the practice of sulphate reducing bacteria on stone surfaces. The biological compresses were applied on different sandstone surfaces: Saxonian sanstones from Dresden, red sandstone from Ksiaz castle in Poland and sandstone from Hildesheim cathedral. The test results showed a quantitative reduction of salts and a slight optical success. Summarizing the results, the use of sulphate reducing bacteria is possible for any restorer with the equipment available at HAWK. However, the bacteria may survive several days when in contact with air oxygen. Because of this, complete control of the process is not given. Concerning both structural salt reduction and aesthetic issues, the method tested is comparable to the classic “AMC compress”. Because of the high financial expenses and expenditure of time, the method cannot be recommended whatsoever. |
| Keywords: | sulphate reducing bacteria, sandstone, gypsum, compress |
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This work is licensed under a Creative Commons BY-NC-ND 3.0 Germany License.
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| DOI (Digital Object Identifier) | 10.5165/hawk-hhg/122 |
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