The Evaluation of Plant-Microbial Remediation of Petroleum Contaminated Soil

The efficiency evaluation of plant-microbial remediation of petroleum hydrocarbons (PHs) contaminated soil is investigated from two levels including single factor pollution risk and soil environmental quality comprehensive evaluation. The single factor index method was used to determine the risk level of PHs polluted soil. The comprehensive index method was used to determine soil quality improvement. The results show that the plant-microbial remediation has a good remediation effect. The topsoil is basically in the level of clean or slight pollution while the peak PHs concentration in soil depth is in the level of low-grade pollution. The soil fertility is improved to general level after restoration. The degree of potential risk is low.