Thermally enhanced approaches for bioremediation of hydrocarbon-contaminated soils

Amedea Perfumo, Ibrahim Banat, Roger Marchant, Luigi Vezzulli

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

Successful remediation of contaminated soils is often limited by the low bioavailability of hydrophobic pollutants, which may slow the process significantly. In this study we investigated the benefits of high temperature in enhancing hydrocarbon degradation rates and evaluated the effect of different biostimulants. Hexadecane polluted soil microcosms with various amendments were incubated both at 60 degrees C and room temperature (18 degrees C) and analyzed periodically up to 40 d for the degradation of hydrocarbon and the response of the microbial population. Natural attenuation showed a satisfactory intrinsic degradative capability at 60 degrees C and the addition of inorganic N, P and K increased the degradation rates by 10%. The addition of rhamnolipid biosurfactant further enhanced the bioavailability of alkane to microbial degradation resulting in up to 71% removal at 60 degrees C and 42% at 18 degrees C. Significant input to hexadecane degradation occurred at 60 degrees C (70%) as a result of the bioaugmentation with thermophilic Geobacillus thermoleouorans T80, which did not take place at 18 degrees C. Coupling high temperature to all amendments resulted in 90% removal of the hexadecane from soil after 40 d which was also accompanied with an increase in bacterial numbers. The results suggest that thermally enhanced bioremediation may be an efficient technology for the treatment of hydrocarbon-contaminated soils. (c) 2006 Elsevier Ltd. All rights reserved.
LanguageEnglish
Pages179-184
JournalChemosphere
Volume66
Issue number1
DOIs
Publication statusPublished - Jan 2007

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bioremediation
hydrocarbon
degradation
bioavailability
natural attenuation
alkane
microcosm
remediation
soil
contaminated soil
pollutant
temperature
rate
removal

Cite this

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title = "Thermally enhanced approaches for bioremediation of hydrocarbon-contaminated soils",
abstract = "Successful remediation of contaminated soils is often limited by the low bioavailability of hydrophobic pollutants, which may slow the process significantly. In this study we investigated the benefits of high temperature in enhancing hydrocarbon degradation rates and evaluated the effect of different biostimulants. Hexadecane polluted soil microcosms with various amendments were incubated both at 60 degrees C and room temperature (18 degrees C) and analyzed periodically up to 40 d for the degradation of hydrocarbon and the response of the microbial population. Natural attenuation showed a satisfactory intrinsic degradative capability at 60 degrees C and the addition of inorganic N, P and K increased the degradation rates by 10{\%}. The addition of rhamnolipid biosurfactant further enhanced the bioavailability of alkane to microbial degradation resulting in up to 71{\%} removal at 60 degrees C and 42{\%} at 18 degrees C. Significant input to hexadecane degradation occurred at 60 degrees C (70{\%}) as a result of the bioaugmentation with thermophilic Geobacillus thermoleouorans T80, which did not take place at 18 degrees C. Coupling high temperature to all amendments resulted in 90{\%} removal of the hexadecane from soil after 40 d which was also accompanied with an increase in bacterial numbers. The results suggest that thermally enhanced bioremediation may be an efficient technology for the treatment of hydrocarbon-contaminated soils. (c) 2006 Elsevier Ltd. All rights reserved.",
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Thermally enhanced approaches for bioremediation of hydrocarbon-contaminated soils. / Perfumo, Amedea; Banat, Ibrahim; Marchant, Roger; Vezzulli, Luigi.

Vol. 66, No. 1, 01.2007, p. 179-184.

Research output: Contribution to journalArticle

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