Microbial diversity in hydrocarbon-contaminated soil was characterized during a bioremediation project at an oil refinery. The project consisted of isolation and cultivation of microbes on laboratory media and the subsequent characterization of pure isolates. In a lagoon at the Czechowice Oil Refinery, Poland, a biopile with actively and passively aerated sections was constructed and has been operated since 1997. The bioremediation process has been continuously monitored by physical, chemical, and microbiological methods. One hundred and forty nine bacterial and fungal strains were isolated from site soils by standard procedures. Analysis of cultivable microorganisms revealed a diverse microbial population within the cultured isolates. Among isolated strains, Pseudomonas and Chryseomonas genera predominated in the bacterial population while Candida, Fusarium, and Trichophyton dominated the fungal population. This paper describes the application of traditional microbiological methods (plating and microscopic methods) to evaluate cultivable microbial diversity in bioremediated soil.
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