Reductive dehalogenation of trichloroethene vapors in an anaerobic biotrickling filter

Environmental Science & Technology
Sudeep C Popat, M A Deshusses

Abstract

Until now, it has not been possible to use biofiltration to treat trichloroethene (TCE) from waste gases generated by soil vapor extraction or dual-phase extraction at remediation sites because aerobic biodegradation of TCE is possible only via cometabolism, which is difficult to engineer on a large scale. This study looks at the possibility of conducting anaerobic gas-phase biotreatment of TCE vapors. The vision is that nitrogen sparging could be substituted for air sparging, resulting in TCE contaminated oxygen-free gas streams which require treatment A lab-scale anaerobic biotrickling filter inoculated with a mixed culture containing multiple Dehalococcoides strains was used for the proof of concept TCE vapors were removed via reductive dechlorination and converted to ethene, cis-1,2-dichloroethene (cis-DCE), and vinyl chloride (VC). Sodium lactate, a fermentable substrate, was provided to the reactor through the recirculating liquid as a source of hydrogen, the electron donor for Dehalococcoides strains. The biotrickling filter was able to remove >90% TCE at loadings of up to 4 g m(bed)(-3) h(-1) and sustained performance for over 200 days. The distribution of the intermediates of TCE biological reduction was found to be af...Continue Reading

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Citations

Jul 4, 2012·Environmental Science & Technology·T Komang Ralebitso-SeniorKirsty Jarvis
Sep 15, 2012·Microbial Cell Factories·Anca G DelgadoRosa Krajmalnik-Brown
May 27, 2014·International Journal of Molecular Sciences·Yan LiHong-Wen Sun
Apr 14, 2010·Biotechnology Advances·Chunping YangShenglian Luo
Oct 13, 2012·Critical Reviews in Biotechnology·Awadhesh Kumar ShuklaSuresh Kumar Dubey
Jul 20, 2021·Synthetic and Systems Biotechnology·Liang XiangJunbiao Dai

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