Improved Methodology for Bioremoval of Black Crusts on Historical Stone Artworks by Use of Sulfate-Reducing Bacteria

Author:

Cappitelli Francesca1,Zanardini Elisabetta2,Ranalli Giancarlo3,Mello Emilio4,Daffonchio Daniele1,Sorlini Claudia1

Affiliation:

1. Dipartimento di Scienze e Tecnologie Alimentari e Microbiologiche, Università degli Studi di Milano, Milan

2. Dipartimento di Scienze Chimiche e Ambientali, Università dell'Insubria, Como

3. Dipartimento di Scienze e Tecnologie Agro-Alimentari, Ambientali e Microbiologiche, Università degli Studi del Molise, Campobasso

4. Syremont, Pavia, Italy

Abstract

ABSTRACT An improved methodology to remove black crusts from stone by using Desulfovibrio vulgaris subsp. vulgaris ATCC 29579, a sulfate-reducing bacterium, is presented. The strain removed 98% of the sulfates of the crust in a 45-h treatment. Precipitation of black iron sulfide was avoided using filtration of a medium devoid of iron. Among three cell carriers, Carbogel proved to be superior to both sepiolite and Hydrobiogel-97, as it allowed an easy application of the bacteria, kept the system in a state where microbial activity was maintained, and allowed easy removal of the cells after the treatment.

Publisher

American Society for Microbiology

Subject

Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology

Reference15 articles.

1. Ausset, P., R. A. Lefèvre, and M. Del Monte. 2000. Early mechanisms of development of sulfated black crusts on carbonate stone, p. 329-337. In V. Fassina (ed.), Proceedings of the 9th International Congress on Deterioration and Conservation of Stone, Venice, Italy. Elsevier Science, Amsterdam, The Netherlands.

2. Bugini, R., M. Laurenzi Tabasso, and M. Realini. 2000. Rate of formation of black crusts on marble. A case study. J. Cultural Heritage1:111-116.

3. Campanella, C. 1990. La conservazione della “pelle” lapidea: dalle tecniche tradizionali all'impiego del Laser. Recuperare50:610-613.

4. Gauri, L. K., A. N. Chowdhury, N. P. Kulshreshtha, and A. R. Punuru. 1989. The sulfation of marble and the treatment of gypsum crusts. Stud. Conserv.34:201-206.

5. Gauri, L. K., L. Parks, J. Jaynes, and R. Atlas. 1992. Removal of sulphated-crust from marble using sulphate-reducing bacteria, p. 160-165. In G. M. Robin (ed.), Stone cleaning and the nature, soiling and decay mechanisms of stone. Proceedings of the International Conference, 14 to 16 April 1992. Donhead Publishing Ltd., Webster, Edinburgh, United Kingdom.

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