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Low temperature bioremediation of oil-contaminated soil using biostimulation and bioaugmentation with a Pseudomonas sp. from maritime Antarctica

Stallwood, B.; Shears, J.; Williams, P.A.; Hughes, K.A.. 2005 Low temperature bioremediation of oil-contaminated soil using biostimulation and bioaugmentation with a Pseudomonas sp. from maritime Antarctica. Journal of Applied Microbiology, 99 (4). 794-802. 10.1111/j.1365-2672.2005.02678.x

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Abstract/Summary

Aims: To identify native Antarctic bacteria capable of oil degradation at low temperatures. Methods and Results: Oil contaminated and pristine soils from Signy Island (South Orkney Islands, Antarctica) were examined for bacteria capable of oil degradation at low temperatures. Of the 300 isolates cultured, Pseudomonas strain ST41 grew on the widest range of hydrocarbons at 4°C. ST41 was used in microcosm studies of low temperature bioremediation of oil-contaminated soils. Microcosm experiments showed that at 4°C the levels of oil degradation increased, relative to the controls, with (i) the addition of ST41 to the existing soil microbial population (bioaugmentation), (ii) the addition of nutrients (biostimulation) and to the greatest extent with (iii) a combination of both treatments (bioaugmentation and biostimulation). Addition of water to oil contaminated soil (hydration) also enhanced oil degradation, although less than the other treatments. Analysis of the dominant species in the microcosms after 12 weeks, using temporal temperature gradient gel electrophoresis, showed Pseudomonas species to be the dominant soil bacteria in both bioaugmented and biostimulated microcosms. Conclusions: Addition of water and nutrients may enhance oil degradation through the biostimulation of indigenous oil-degrading microbial populations within the soil. However, bioaugmentation with Antarctic bacteria capable of efficient low temperature hydrocarbon degradation may enhance the rate of bioremediation if applied soon after the spill. Significance and Impact of the Study: In the future, native soil bacteria could be of use in bioremediation technologies in Antarctica.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1111/j.1365-2672.2005.02678.x
Programmes: BAS Programmes > Other Special Projects
BAS Programmes > Antarctic Science in the Global Context (2000-2005) > Life at the Edge - Stresses and Thresholds
ISSN: 1364-5072
Additional Keywords: Bacteria, Oil pollution
NORA Subject Terms: Biology and Microbiology
Ecology and Environment
Date made live: 01 Feb 2008 11:30
URI: http://nora.nerc.ac.uk/id/eprint/2008

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