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Higher thermal remediation temperature facilitates the sequential bioaugmented reductive dechlorination.

Wan Huang1, Lifeng Cao2, Runlei Ge1

  • 1State Key Joint Laboratory of Environment Simulation and Pollution Control, State Environment Protection Key Laboratory of Microorganism Application and Risk Control, School of Environment, Tsinghua University, Beijing 100084, China.

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Summary

Higher temperatures in sequential thermal remediation enhance microbial reductive dechlorination (MRD) by promoting organohalide-respiring bacteria (OHRB) and electron donor availability for chlorinated solvent cleanup.

Keywords:
Bioaugmented reductive dechlorinationDesulfitobacteriumInterspecific interactionThermal remediationVolatile fatty acids (VFAs)

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Area of Science:

  • Environmental Science
  • Microbiology
  • Environmental Engineering

Background:

  • Chlorinated solvent contamination poses significant environmental risks.
  • Coupling thermal remediation with microbial reductive dechlorination (MRD) is a promising cleanup strategy.
  • Optimizing sequential application is crucial for effective remediation.

Purpose of the Study:

  • To investigate the synergistic effects of sequential thermal remediation and bioaugmentation on chlorinated solvent cleanup.
  • To determine the impact of thermal treatment temperature on subsequent MRD performance.
  • To elucidate the microbial community dynamics influenced by thermal treatment.

Main Methods:

  • Sequential application of thermal treatment and bioaugmentation.
  • Analysis of trichloroethylene (TCE) dechlorination performance.
  • Amplicon sequencing for microbial community structure analysis.
  • Co-occurrence network analysis.

Main Results:

  • Prior thermal treatment significantly improved TCE dechlorination, with a key promotion effect observed at 60°C.
  • Higher thermal temperatures (up to 90°C) reduced indigenous microbial richness and diversity, simplifying community structure.
  • This simplification facilitated the colonization of introduced organohalide-respiring bacteria (OHRB), such as Desulfitobacterium, which increased in abundance.
  • Released volatile fatty acids (VFAs) from thermal treatment served as essential electron donors, boosting MRD.

Conclusions:

  • Temperature is a dominant factor influencing microbial community structure and MRD performance in sequential remediation.
  • Prior thermal treatment enhances subsequent bioaugmentation by creating favorable conditions for OHRB.
  • The study provides temperature-specific insights for optimizing coupled thermal remediation and bioaugmentation for chloroethene-impacted sites.