The Use Of Thermophilic Bacteria In
Accelerated Hydrocarbon Bioremediation
Author(s)
A. Perfumo, I. M. Banat & R. Marchant
Abstract
Successful bioremediation of hydrocarbon contamination in terrestrial as well as
aquatic ecosystems is generally limited by the low bioavailability of hydrophobic
pollutants. Considerably higher mass transfer rates and hydrocarbon solubilities
can be obtained at higher temperatures, but so far approaches to bioremediation
at increased temperature have hardly been investigated. The biotechnological
significance and the benefits of the use of thermophilic bacteria in enhancing
hydrocarbon removal under different environmental conditions were
investigated. Expression of the alkane mono-oxygenase alkB gene responsible
for the initial step in the degradation of alkanes in soil geobacilli was found to be
induced by the presence of such a substrate at high temperature, and this explains
the increased degradation rates achieved in hexadecane-contaminated
microcosms incubated at 60°C compared to mesophilic conditions. Additional
benefits of increasing hydrocarbon degradation also occur when thermophilic
bacteria capable of producing biosurfactants which act as solubilising agents in
such systems are introduced. We conclude that thermally accelerated
bioremediation may be an effective technology for hydrocarbon contaminated
soil bioremediation.
Keywords: thermophiles, geobacilli, bioremediation, biosurfactants.
1 Introduction
Removal of contamination from soils, sediments, groundwater, surface water and
air with hazardous and toxic compounds is a priority task for the restoration of
the natural environment due to the serious threat contaminants pose to
ecosystems and human health. Among the many techniques employed to
Keywords
thermophiles, geobacilli, bioremediation, biosurfactants.
Related Book
Other papers in this volume
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