Effects of freezing and thawing on microbial remediation of petroleum-contaminated soil

Based on the related studies during the recent decade on microbial remediation of petroleum-contaminated soil,the principle,present situation and influencing factors of microbial remediation were summarized.Meanwhile,the existing problems were also mentioned in this paper.The effects of freezing and thawing on microorganism and environmental factors in the microbial remediation of petroleum-contaminated soil were discussed in order to improve remediation efficiency of petroleum-contaminated soil in northeastern China.