Earth Science Frontiers ›› 2024, Vol. 31 ›› Issue (2): 157-172.DOI: 10.13745/j.esf.sf.2023.8.21

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Bioremediation technologies for cleaning up chlorinated-hydrocarbon contaminated sites—a review

ZHENG Jiarui(), LENG Wenpeng, WANG Jiajia, ZHI Liqin, WANG Shuo, LI Jiabin, GUO Peng*(), WEI Wenxia*(), SONG Yun   

  1. Beijing Key Laboratory of Industrial Site Investigation and Remediation, Institute of Resources and Environment, Beijing Academy of Science and Technology, Beijing 100095, China
  • Received:2023-06-03 Revised:2023-07-02 Online:2024-03-25 Published:2024-04-18

Abstract:

Chlorinated hydrocarbons (CAHs) are widely used as raw materials in industrial and agricultural productions, and their improper disposal and accidental leakage has made it one of the most common toxic and harmful contaminants in soil and groundwater, posing serious risks to human health and the environment. Bioremediation is ideal for the treatment of chlorinated hydrocarbon pollution due to its green, economic, efficiency, and no-secondary-pollution advantages. This paper first summarizes the physical and chemical properties of CAH, CAH transport in the environment, and CAH biodegradation mechanisms, and reviews research progress on bioremediation technologies (biostimulation, bioaugmetation and combined technology) for CAH polluted environment, as well as on mechanisms of bacterial degradation and transformation, with examples of bioremediation testing conducted at different scales, from laboratory to pilot testing. The paper then discusses factors influencing the effectiveness of bioremediation technology for CAH pollution management. Finally, the paper discusses the challenges in bioremediation of CAH contaminated sites and future research to address these challenges, which include mining and analyzing low-abundance CAH-degrading bacteria using single-cell technology (microporous chips, extreme dilution, etc.), developing efficient combined technology such as combining solar heating with in-situ bioremediation, and strengthening research on the factors affecting the remediation outcomes, in order to provide technical support for efficient and green treatment of CAHs pollution.

Key words: chlorinated hydrocarbons, pollution, physical and chemical properties, migration and transformation, biodegradation mechanism, bioremediation technology

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