A complementary approach to identifying and assessing the remediation potential of hydrocarbonoclastic bacteria

Krishna Kadali, Keryn Simons, Pawel Skuza, Bob Moore, Andrew Ball

    Research output: Contribution to journalArticle

    39 Citations (Scopus)

    Abstract

    The isolation and assessment of hydrocarbonoclastic bacteria often represents a key strategy in the bioremediation of hydrocarbon-contaminated sites. However the isolation and assessment of such bacteria is often a lengthy and expensive procedure. The aim of this study was to identify potential isolates for use in the remediation of hydrocarbon contaminated sites using a combination of selective isolation plating, the Biolog system and subsequent multivariate analyses. The use of weathered oil as the main C source restricted the number of isolates growing to 5×10 2CFUg soil -1. Isolates (n=96) were then assessed individually using Biolog MT2 plates with seven different hydrocarbons (dodecane, tridecane, hexadecane, octadecane, eicosane, naphthalene and phenanthrene). The results indicated that all isolates were able to grow on at least one hydrocarbon from the seven chosen. This confirmed that the isolation media developed was selective in isolating hydrocarbonoclastic bacteria only. Cluster analysis of Biolog data separated the isolates into two discrete clusters with cluster 2 identifying hydrocarbonoclastic bacteria that are effective in degrading a variety of contaminants. Further study on the isolates from cluster 2 was carried out based on their phylogenetic analysis. Phylogenetic analysis of 28 bacterial isolates from cluster 2 based on the 1500bp sequences from 16S rDNA genes using MRBAYES confirmed all isolates as being hydrocarbonoclastic, providing supportive evidence that isolates from cluster 2 have a potential use in bioremediation. This approach could improve both the speed and efficiency of the commercial bioremediation process.

    Original languageEnglish
    Pages (from-to)348-355
    Number of pages8
    JournalJournal of Microbiological Methods
    Volume88
    Issue number3
    DOIs
    Publication statusPublished - Mar 2012

    Keywords

    • Biolog MT plates
    • Bioremediation
    • Cluster analysis
    • Hydrocarbonoclastic bacteria
    • Phylogenetic analysis
    • Weathered crude oil

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