Abstract: Polycyclic aromatic hydrocarbons (PAHs) and heavy metals are representatives of soil organic and inorganic pollutants. They can easily cause combined contamination of soil because of the wide spread pollution sources and long-term existence in the soil. Complex interactions occur when PAHs and heavy metals coexist, which makes soil remediation more difficult than single contamination. Bioremediation has the advantages of low cost, no secondary pollution, which is suitable for remediation of large-area contaminated soil. It is a promising technology for the remediation of soil co-contaminated by PAHs and heavy metals. This paper describes the distribution characteristics of combined pollution and interaction of PAHs and heavy metals in soil, summarizes the mechanism and research progress of bioremediation technology for soil co-contaminated by PAHs and heavy metals, and puts forward the prospect for the development of bioremediation technology.

Key words: polycyclic aromatic hydrocarbons, heavy metal, co-contamination, bioremediation, soil remediation.