Restoration of petroleum-contaminated soil is one of the most important issues of environment protection all over the world. In order to study the influence of pollution concentration on biodegradation, a specific exogenous microbe, Phanerochaete chrysosporium, was employed for bioremediation of soil contaminated by different concentrations of petroleum. After 60d of treatment, the degradation rate of three concentration levels, low, medium and high concentrations, were 60%, 70% and 72% respectively. Through kinetic analysis, the degradation rate of medium and high concentrations was significantly higher than that of low petroleum concentration. And the higher the concentration is, the better the degradation is. Both the experimental and theoretical results show that the microbial activity and biodegradation rate is related to petroleum concentration, which provides the data support for the remediation of the petroleum-contaminated soil.
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