ABSTRACT
In this study, three dominant bacteria Cellulomonas flavigena (â ), Cellulomonas flavigena (â ¡), Sphingomonas paucimobilis (â ¢) from Fire Phoenix rhizosphere soil were used to develop a multi-microbial agent system. For oil-contaminated soil in the Dagang oilfield, the immobilized test bacteria were inoculated into the Fire Phoenix rhizosphere soil to examine the effects of bacterial agents on polycyclic aromatic hydrocarbons (PAHs)-contaminated soil. The results showed that PAHs degradation was promoted under the â â ¢ (with an effective number of viable bacteria of 109 cfu·mL-1) and â â ¡â ¢ (with an effective number of viable bacteria of 107 cfu·mL-1) treatments. The PAHs degradation rates were 32.2% and 41.4%, respectively, being significantly higher than that in the control treatments. The â â ¡â ¢ treatment significantly promoted the belowground biomass of Fire Phoenix, which was 31.2% higher than that of the control treatment. Our results suggested that the multi-microbial agent constructed by the three dominant bacteria â â ¡â ¢ could be used as a strengthening method for the remediation of PAHs-contaminated soil by Fire Phoenix, which provided a novel method for microbial enhanced phytoremediation technology.