International Journal of Environmental Sciences

Volume 6 Issue 4 2015- January 2016 Pages: 472- 482 <<Previous    Next>>

Degradation of low molecular weight polycyclic aromatic hydrocarbons by microorganisms isolated from contaminated soil

Author Information:

Haritash A.K, Kaushik C.P - Department of Environmental Science and Engineering, Guru Jambheshwar University of Science and Technology, Hisar, Haryana, India (125 001)

ABSTRACT

Degradation of low molecular weight PAHs by two bacterial species Micrococcus luteus and Kocuria rosea has been reported for the first time in the present study. Three fungal species of Aspergillus were also studied for their PAH-degradation potential. The microorganisms were isolated from oil contaminated soil and adapted with an exposure to high dose of PAH compounds for one year under laboratory conditions. The efficiency towards biodegradation increased from Kocuria rosea (55.4%) to Aspergillus ficuum (57.2%)to Aspergillus flavus (63.2%) to Micrococcus luteus (63.6%) to Aspergillus fumigatus (63.9%). Maximum degradation was observed for naphthalene followed by phenanthrene, fluoranthene, and pyrene for bacteria. M. luteus could degrade the compounds at a faster rate than K. rosea. A. flavus and A. fumigatus strains were better adapted to degradation. On the other hand, the removal efficiency of A. ficuum was considerably less, but it could remove fluoranthene efficiently. Observed trend of PAH biodegradation may be a function of melting point, aqueous solubility, structure of the PAH compound, and microbial growth. The microorganisms reported in the study can prove useful in remediation of PAH contaminated sites and may find an application in the design of novel bioremediation protocols

Keywords: Biodegradation, PAHs, Biodegradation, Aspergillus, Micrococcus, Kocuria rosea

DOI:10.6088/ijes.6053

© 2016 Copyright by the authors, licensee Integrated Publishing Association.This is an open access article distributed under the Creative Commons Attribution License (3.0) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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