Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2748

Full Length Research Paper

Pilot bioremediation of contaminated soils by hydrocarbons, from an electricity production and distribution site in Ouagadougou, Burkina Faso

Wendlassida Pauline Ouédraogo
  • Wendlassida Pauline Ouédraogo
  • Department of Life and Earth Sciences, Research and training Unit of Science and Technology, Norbert ZONGO University, Burkina Faso.
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Cécile Harmonie Otoidobiga
  • Cécile Harmonie Otoidobiga
  • Department of Life and Earth Sciences, Research and training Unit of Science and Technology, Norbert ZONGO University, Burkina Faso.
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Cheik Amadou Tidiane Ouattara
  • Cheik Amadou Tidiane Ouattara
  • Department of Biochemistry and Microbiology, Research and training Unit of Life and Earth Sciences, Joseph Ki-Zerbo University, Burkina Faso.
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Aboubakar Sidiki Ouattara
  • Aboubakar Sidiki Ouattara
  • Department of Biochemistry and Microbiology, Research and training Unit of Life and Earth Sciences, Joseph Ki-Zerbo University, Burkina Faso.
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Alfred S. Traoré
  • Alfred S. Traoré
  • Department of Biochemistry and Microbiology, Research and training Unit of Life and Earth Sciences, Joseph Ki-Zerbo University, Burkina Faso.
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  •  Received: 04 July 2020
  •  Accepted: 23 September 2020
  •  Published: 30 November 2020

Abstract

The bioremediation of polluted soils by hydrocarbons is a set of decontamination techniques which exploit the depolluting activity of living organisms in order to reduce the toxicity, mobility or quantity of a contaminant in the environment. This work has enabled the bioremediation of a soil contaminated with hydrocarbons by exploiting endogenous microorganisms of the environment. The depollution method used was the "off situ" treatment. Thus, a pilot sample of polluted soil excavated on a site was conveyed to another site accommodating a structure specialized for the biotreatment of the polluted environments. The soil was successively placed in heaps ("heap 1" and "heap 2") on two compartments of a treatment platform and submitted for 08 months to  bio-pollution with an improvement in the living conditions of endogenous microorganisms like contribution of substrates,  periodic watering and reversal of the medium. Previously, a pre-treatment was carried out on the samples including screening, breaking of large fragments of soil and homogenization. A total oil reduction rate of 62.32% was observed for "heap 1" and 67.92% for "heap 2". The temperature, pH and humidity of the two heaps were varied, respectively between 16 and 39°C, 6.5 and 8 and 35 and 80%. Otherwise, microbiological analysis showed a proliferation of aerobic microflora such as bacteria and molds in the two soil piles.

Key words: Hydrocarbon, polluted soil, bioremediation, microorganisms.