Influence of special surfactants on the microbial degradation of mineral oils |
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Authors: | Riis V Brandt M Miethe D Babel W |
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Institution: | Department of Environmental Microbiology, UFZ Centre for Environmental Research Leipzig-Halle, Germany. |
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Abstract: | Various surfactants belonging to the group of fatty acid-acylated amino acids were tested for their ability to accelerate the microbial degradation of mineral oil. Of the lauric acid-acylated amino acids, aliphatic acids and histidine were found to be the most suitable. By the aid of these compounds additional 20-60% of a residual oil fraction could be degraded. The longer the chain of the fatty acid moiety, the more effective the surfactants are. Natural L-amino acids were more effective than their D-configuration. Since the special surfactants are easily biologically degradable, multiple replenishment is required in long-term experiments. The faster, more complete degradation of mineral oil is caused solely by interfacial activity; the growth of biomass due to the function of surfactants as substrate had no effect. |
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