Abstract
The objective of this study was to investigate the effects of compound aging in soil, bacterial type inoculated, and the number of desorption steps on the biodegradation of phenanthrene and pyrene. A batch biodegradation study was conducted in a 3 2 3 Latin Square design to achieve this objective. The results indicated that only the number of desorption steps used yielded a statistical difference ( p < .05). To compare the significance of the desorption effects in conjunction with compound aging and bacteria type, the Tukey's honestly significant difference test ( f = 0.05) was performed. As expected, the zero-time desorption step yielded a more significant increase in biodegradation than two- and six-time desorption steps which had similar results. Furthermore, the presence of a recalcitrant cosolute (pyrene) had a detrimental effect on phenanthrene degradation with bacteria that had been acclimated with phenanthrene as the sole carbon source. Increases in the number of desorption steps decreased the toxicity of pyrene to the phenanthrene-degraders. As anticipated, the lack of substrate availability yielded limited microbial growth and subsequent contaminant biodegradation.
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