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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Overview:  
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.

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Keywords: sulphate reducing bacteria, sandstone, gypsum, compress
Details:
  • academic institution:  HAWK Hochschule für angewandte Wissenschaft und Kunst Hildesheim/ Holzminden/Göttingen
  • kind of theses:  Diplomarbeit
  • main Tutor:  Prof. Dr. Karin Petersen
  • assistant Tutor:  Prof. Jan Schubert
  • date:  2006
  • Language:  German
  • pages:  127
  • pictures:  52
 
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Creative Commons Lizenzvertrag This work is licensed under a Creative Commons BY-NC-ND 3.0 Germany License.
DOI (Digital Object Identifier) 10.5165/hawk-hhg/122
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