Biostimulation of indigenous communities for the successful dechlorination of tetrachloroethene (perchloroethylene)-contaminated groundwater

Sayali Patil, Eric Adetutu, Arturo Aburto-Medina, Robert Menz, A Ball

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    Chlorinated ethenes are of environmental concern with most reports of successful microbial-mediated remediation being associated with major dechlorinating groups such as Dehalococcoides (Dhc) species. However, limited information is available on the community dynamics and dechlorinating activities of indigenous non-Dhc groups. Here, we present evidence of dechlorination of tetrachloroethene (perchloroethylene, PCE) in groundwater samples by indigenous microbial communities. 100 % PCE conversion to ethene was observed in acetate-stimulated 24 week-microcosms (controls; 15 %). Microbial community profiles showed dominance by groups such as Proteobacteria, Spirochaetes, Firmicutes, Methanomicrobiaceae and Methanosarcinaceae. Pareto-Lorenz (PL) analyses suggested an adapted (45 % PL value) but variable bacterial community (55.5 % Δt(week)) compared to Archaea (25 % PL value; 46.9 % Δt(week)). Our findings provide evidence of dechlorinating potential of indigenous microorganisms and useful information on their dynamics which may be exploited for in situ groundwater bioremediation.

    Original languageEnglish
    Pages (from-to)75-83
    Number of pages9
    JournalBiotechnology Letters
    Volume36
    Issue number1
    DOIs
    Publication statusPublished - 2014

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