Previous studies have provided evidence that bioremediation deals a novel approach to graffiti removal, thereby overcoming well-known limitations of current cleaning methods. In the present study eight bacteria aerobic, mesophilic and culturable from the American ATCC and the German DSMZ collections of microorganisms, some isolated from car paint waste, coloured deposits in a pulp dryer and wastewater from dye works, were tested in the removal of silver and black graffiti spray paints using immersion strategies with glass slides. Absorbance at 600 nm and live/dead assays were performed to estimate bacterial density and activity in all samples. Also, pH and dissolved organic carbon (DOC) and inorganic carbon (DIC) measurements in the liquid media were made, as well as, thickness, colorimetric and infrared (FTIR) spectroscopy measurements in graffiti paint layers were used to evaluate the presence of the selected bacteria in the samples and the graffiti bioremoval capacity of bacteria. Data demonstrated that of the eight bacteria studied, Enterobacter aerogenes, Comamonas sp. and a mixture of Bacillussp., Delftia lacustris, Sphingobacterium caeni, and Ochrobactrum anthropiwere the most promising for bioremoval of graffiti. According to significant changes in FTIR spectra, indicating an alteration of the paint polymeric structure, coupled with the presence of a consistent quantity of live bacteria in the medium as well as a significant increase of DIC (a measure of metabolic activity) and a change in paint color.

Bioremoval of graffiti using novel commercial strains of bacteria / C. Catto', P. Sanmartin, D. Gulotta, F. Troiano, F. Cappitelli. - In: SCIENCE OF THE TOTAL ENVIRONMENT. - ISSN 0048-9697. - 756(2021 Feb 20), pp. 144075.1-144075.13. [10.1016/j.scitotenv.2020.144075]

Bioremoval of graffiti using novel commercial strains of bacteria

C. Catto';F. Troiano;F. Cappitelli
2021-02-20

Abstract

Previous studies have provided evidence that bioremediation deals a novel approach to graffiti removal, thereby overcoming well-known limitations of current cleaning methods. In the present study eight bacteria aerobic, mesophilic and culturable from the American ATCC and the German DSMZ collections of microorganisms, some isolated from car paint waste, coloured deposits in a pulp dryer and wastewater from dye works, were tested in the removal of silver and black graffiti spray paints using immersion strategies with glass slides. Absorbance at 600 nm and live/dead assays were performed to estimate bacterial density and activity in all samples. Also, pH and dissolved organic carbon (DOC) and inorganic carbon (DIC) measurements in the liquid media were made, as well as, thickness, colorimetric and infrared (FTIR) spectroscopy measurements in graffiti paint layers were used to evaluate the presence of the selected bacteria in the samples and the graffiti bioremoval capacity of bacteria. Data demonstrated that of the eight bacteria studied, Enterobacter aerogenes, Comamonas sp. and a mixture of Bacillussp., Delftia lacustris, Sphingobacterium caeni, and Ochrobactrum anthropiwere the most promising for bioremoval of graffiti. According to significant changes in FTIR spectra, indicating an alteration of the paint polymeric structure, coupled with the presence of a consistent quantity of live bacteria in the medium as well as a significant increase of DIC (a measure of metabolic activity) and a change in paint color.
graffiti; bacteria; bioremoval; spray paint; innovative cleaning method.
Settore AGR/16 - Microbiologia Agraria
26-nov-2020
SCIENCE OF THE TOTAL ENVIRONMENT
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/798140
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