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Hydrolytic Enzymes and Surfactants of Bacterial Isolates from Lubricant- Contaminated Wastewater

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Hydrolytic Enzymes and Surfactants of Bacterial Isolates from Lubricant- Contaminated Wastewater

Evgenia Vasileva-Tonkova and Danka Galabova

*

Bulgarian Academy of Sciences, Institute of Microbiology, Acad. G. Bonchev str., bl. 26, 1113 Sofia, Bulgaria. Fax: +35 92 70 01 09. E-mail: dgal@microbio.bas.bg

* Author for correspondence and reprint requests

Z. Naturforsch.58 c, 87Ð92 (2003); received July 6/August 15, 2002

Fifteen bacterial monocultures were isolated from lubricant-contaminated wastewater of an electric power station in Sofia. Six isolates showed best growth in liquid media with 1.5% hexadecane, and on mineral salt agar plates supplemented with one of the following hydrocarbons: n-hexadecane, paraffin, kerosene and samples of wastewater. The ability of all isolates to produce extracellular hydrolytic enzymes and surface-active glycolipids was assessed on the basis of their growth on hydrocarbons. The study of this relatively closed micro-ecosystem revealed the existence of well-balanced microbial consortium where dif- ferent members have their own role and support each other. On this basis, an alternative approach is proposed for bioaugmented clean up of wastewater contaminated with hydrocar- bons and organic polymers using a mixed culture of indigenous bacteria that combines the best producers of glycolipids and hydrolytic enzymes.

Key words:Hydrolytic Enzymes, Glycolipids, Hexadecane

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