The influence of electrokinetic bioremediation on subsurface microbial communities at a perchloroethylene contaminated site

Megan Meinel, James Wang, Evan Cox, Phil Dennis, César Torres, Rosa Krajmalnik-Brown

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Abstract: There is an increased interest in finding remedies for contamination in low permeability and advection-limited aquifers. A technology applicable at these sites, electrokinetic-enhanced bioremediation (EK-BIO), combines traditional bioremediation and electrokinetic technologies by applying direct current to transport bioremediation amendments and microbes in situ. The effect of this technology on the native soil microbial community has only been previously investigated at the bench scale. This research explored the influence of EK-BIO on subsurface microbial communities at a field-scale demonstration site. The results showed that, similar to the findings in laboratory studies, alpha diversity decreased and beta diversity differed temporally, based on treatment phase. Enrichments in specific taxa were linked to the bioaugmentation culture and electron donor. Overall, findings from our study, one of the first field-scale investigations of the influence of electrokinetic bioremediation on subsurface microbial communities, are very similar to bench-scale studies on the topic, suggesting good correlation between laboratory and field experiments on EK-BIO and showing that lessons learned at the benchtop are important and relevant to field-scale implementation. Key points: • Microbial community analysis of field samples validates laboratory study results • Bioaugmentation cultures and electron donors have largest effect on microbial community

Original languageEnglish (US)
Pages (from-to)6489-6497
Number of pages9
JournalApplied Microbiology and Biotechnology
Volume105
Issue number16-17
DOIs
StatePublished - Aug 2021

Keywords

  • Bioremediation
  • Dechlorination
  • Electrokinetic
  • Microbial community

ASJC Scopus subject areas

  • Biotechnology
  • Applied Microbiology and Biotechnology

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