Abstract
Two species of Bacillus, B. thuringiensis B3 and B. cereus B6, isolated from crude oil-contaminated sites in Ecuador, were tested for their capability in degrading polycyclic aromatic hydrocarbons (PAHs) in diesel (shake-flask), and to remove total petroleum hydrocarbons (TPHs) from crude oil- or spent lubricating oil-polluted soils (plot-scale). TPHs and PAHs were analyzed by Gas chromatography-Flame ionization detector (GC-FID) and High performance liquid chromatography (HPLC), respectively. Degradation percentages of PAHs by strain B6 were in the range of 11–83 after 30 days. A mixed culture of both the strains removed 84% and 28% of TPHs from crude oil- and spent lubricating oil-polluted soils, respectively. Reduction in the abundance of total n-alkane fractions (C8–C40) of spent lubricating oil was 94%, which was 18% higher than the control. Our results clearly indicate that the selected strains have great potential in degrading petroleum hydrocarbons at both laboratory- and field-scales.
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Acknowledgements
This work was financially supported by Secretaría Nacional de Educación Superior, Ciencia, Tecnología e Innovación (SENESCYT-Ecuador) Prometeo research project during 2013–2015.
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Raju, M.N., Leo, R., Herminia, S.S. et al. Biodegradation of Diesel, Crude Oil and Spent Lubricating Oil by Soil Isolates of Bacillus spp.. Bull Environ Contam Toxicol 98, 698–705 (2017). https://doi.org/10.1007/s00128-017-2039-0
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DOI: https://doi.org/10.1007/s00128-017-2039-0