Enhancement of the Bioremediation of Pyrene-Contaminated Soils Using a Hematite Nanoparticle-based Modified Fenton Oxidation in a Sequenced Approach

The effect of modified Fenton oxidation using synthesized hematite nanoparticles and sodium pyrophosphate as a chelating agent was investigated for the pretreatment of pyrene-contaminated soil in a sequence with bioremediation. Synthesized hematite nanoparticles comprised hematite according to X-ray...

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Bibliographic Details
Published in:Soil & sediment contamination 2017-02, Vol.26 (2), p.141-156
Main Authors: Jorfi, Sahand, Samaei, Mohammad Reza, Darvishi Cheshmeh Soltani, Reza, Talaie Khozani, Amirreza, Ahmadi, Mehdi, Barzegar, Gelavizh, Reshadatian, Neda, Mehrabi, Nasim
Format: Article
Language:English
Subjects:
Acidovorax
Bacillus cereus
Bacillus thuringiensis
Bioremediation
Hematite
hematite-nanoparticles
modified Fenton oxidation
Nanoparticles
Oxidation
Pyrene
Reaction kinetics
Sodium
Soil contamination
Synthesis
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Summary:The effect of modified Fenton oxidation using synthesized hematite nanoparticles and sodium pyrophosphate as a chelating agent was investigated for the pretreatment of pyrene-contaminated soil in a sequence with bioremediation. Synthesized hematite nanoparticles comprised hematite according to X-ray diffraction (XRD) analysis, with particle sizes ranging between 28 and 55 nm. Three pyrene-degrading bacteria, Bacillus cereus, Acidovorax wohlfahrtii, and Bacillus thuringiensis, were isolated from hydrocarbon-contaminated soil and used as inoculums for the bioremediation. A sequence of modified Fenton oxidation-bioremediation using a synthesized hematite nanoparticles dosage of 30 mM and H 2 O 2 concentration of 300 mM significantly enhanced the pyrene removal rate to 96%, 87%, and 82% compared to 88%, 59%, and 37%, which were obtained during the bioremediation alone for synthetically fresh, aged, and naturally contaminated soil with initial pH 7, respectively. The results of kinetic studies indicated that modified Fenton oxidation of pyrene-contaminated soil was best fitted with a pseudo-first order kinetic model. Consequently, a sequence of modified Fenton-bioremediation can effectively remediate polycyclic aromatic hydrocarbon-contaminated sites in a shorter reaction time than bioremediation alone.
ISSN:1532-0383
1549-7887
DOI:10.1080/15320383.2017.1255875