Electrokinetically-enhanced emplacement of lactate in a chlorinated solvent contaminated clay site to promote bioremediation

WATER RESEARCH

卷:201

Article

Inglis, Ainsley M.¹  Head, Nicholas A.¹  Chowdhury, Ahmed I. A.²  Garcia, Ariel Nunez¹  Reynolds, David A.³  Hogberg, Dave³  Edwards, Elizabeth⁴  Lomheim, Line⁴  Weber, Kela⁵  Wallace, Sarah J.⁵  Austrins, Leanne M.⁶  Hayman, Jennifer⁷  Auger, Marlaina³  Sidebottom, Audrey⁸  Eimers, Jake⁷  Gerhard, Jason I.¹  O'Carroll, Denis M.⁹ 

[1] Univ Western Ontario, Dept Civil & Environm Engn, 1151 Richmond Rd, London, ON N6A 5B8, Canada

[2] Bangladesh Univ Engn & Technol, Inst Water & Flood Management, Dhaka, Bangladesh

[3] Geosyntec Consultants, 130 Stone Rd W, Guelph N1G 3Z2, ON, Canada

[4] Univ Toronto, 27 Kings Coll Cir, Toronto, ON M5S 3H7, Canada

[5] Royal Mil Coll Canada, 13 Gen Crerar Crescent, Kingston, ON K7K 7B4, Canada

[6] Dow Chem Environm Remediat & Compliance, Midland, MI 48674 USA

[7] Jacobs, 72 Victoria St S, Kitchener, ON N2G 4Y9, Canada

[8] Dow Chem, Ft Saskatchewan, AB, Canada

[9] Univ New South Wales, Sch Civil & Environm Engn, Water Res Ctr, Sydney, NSW 2052, Australia

关键词: Electrokinetics;    Bioremediation;    Lactate;    Clay;    Chlorinated solvents;    field Study;   

DOI  :  10.1016/j.watres.2021.117305

来源: Elsevier

【 摘 要 】

Bioremediation through the injection of electron donors and bacterial cultures is effective at treating chlorinated solvent contamination. However, it has had limited application in low permeability zones where amendments cannot be delivered successfully. This field-scale study investigated the application of electrokinetics to enhance the delivery of lactate at a clay site contaminated with chlorinated solvents. Groundwater and soil samples were collected before, during and for 1 year after the 71-day field test and analyzed for a wide suite of chemical and biological parameters. Lactate was successfully delivered to all monitoring locations. Lactate emplacement resulted in the stimulation of bacterial populations, specifically within the phylum Firmicutes, which contains fermenters and strict anaerobes. This likely led to biodegradation, as the field trial resulted in significant decreases in both soil and aqueous phase chlorinated solvent concentrations. Contaminant decreases were also partially attributable to dilution, given evidence of some advective lactate flux. This research provides evidence that electrokinetically-enhanced bioremediation has potential as a treatment strategy for contaminated low permeability strata.

【 授权许可】

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