Electrokinetic-enhanced bioaugmentation for remediation of chlorinated solvents contaminated clay

JOURNAL OF HAZARDOUS MATERIALS

卷:213

Article

Mao, Xuhui^1,6  Wang, James²  Ciblak, Ali¹  Cox, Evan E.²  Riis, Charlotte³  Terkelsen, Mads⁴  Gent, David B.⁵  Alshawabkeh, Akram N.¹ 

[1] Northeastern Univ, Dept Civil & Environm Engn, Boston, MA 02115 USA

[2] Geosyntec Consultants, Columbia, MA USA

[3] NIRAS AS, Allerod, Denmark

[4] Capital Reg Denmark, Hillerod, Denmark

[5] US Army Corps Engineers, Engineer Res & Dev Ctr, Environm Lab, Vicksburg, MS USA

[6] Wuhan Univ, Sch Resources & Environm Sci, Wuhan 430079, Peoples R China

关键词: Bioaugmentation;    Electrokinetic injection;    Contaminated clay;    Bacteria transport;    Chlorinated solvents;   

DOI  :  10.1016/j.jhazmat.2012.02.001

来源: Elsevier

【 摘 要 】

Successful bioremediation of contaminated soils is controlled by the ability to deliver bioremediation additives, such as bacteria and/or nutrients, to the contaminated zone. Because hydraulic advection is not practical for delivery in clays, electrokinetic (EK) injection is an alternative for efficient and uniform delivery of bioremediation additive into low-permeability soil and heterogeneous deposits. EK-enhanced bioaugmentation for remediation of clays contaminated with chlorinated solvents is evaluated. Dehalococcoides (Dhc) bacterial strain and lactate ions are uniformly injected in contaminated clay and complete dechlorination of chlorinated ethene is observed in laboratory experiments. The injected bacteria can survive, grow, and promote effective dechlorination under EK conditions and after EK application. The distribution of Dhc within the clay suggests that electrokinetic transport of Dhc is primarily driven by electroosmosis. In addition to biodegradation due to bioaugmentation of Dhc. an EK-driven transport of chlorinated ethenes is observed in the clay, which accelerates cleanup of chlorinated ethenes from the anode side. Compared with conventional advection-based delivery, EK injection is significantly more effective for establishing microbial reductive dechlorination capacity in low-permeability soils. (C) 2012 Elsevier B.V. All rights reserved.

【 授权许可】

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