Binning, Philip John

Bjerg, Poul Løgstrup

Broholm, Mette

Chambon, Julie Claire Claudia

Christiansen, Camilla Maymann

Christophersen, Mette

Damgaard, Ida

Kerrn-Jespersen, Henriette

Manoli, Gabriele

Pade, Dorte Moon

Tsitonaki, Aikaterini

Westergaard, Claus

Online Research Database In Technology

                       General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.  • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal   If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.     Downloaded from orbit.dtu.dk on: Dec 20, 2017In-situ remediation of TCE by ERD in clay tills. Feasibility and performance of full-scaleapplication insights gained through an integrated investigative approach for 2 sitesBroholm, Mette; Damgaard, Ida; Chambon, Julie Claire Claudia; Manoli, Gabriele; Pade, Dorte Moon;Christiansen, Camilla Maymann; Binning, Philip John; Westergaard, Claus; Tsitonaki, Aikaterini;Christophersen, Mette; Kerrn-Jespersen, Henriette; Bjerg, Poul LøgstrupPublication date:2012Link back to DTU OrbitCitation (APA):Broholm, M., Damgaard, I., Chambon, J. C. C., Manoli, G., Pade, D. M., Christiansen, C. M., ... Bjerg, P. L.(2012). In-situ remediation of TCE by ERD in clay tills. Feasibility and performance of full-scale applicationinsights gained through an integrated investigative approach for 2 sites. Abstract from 4th Joint Nordic Meetingon Remediation of Contaminated Sites, Oslo, Norway.Abstract for NORDROCS 2012. The 4th Joint Nordic Meeting on Remediation of Contaminated Sites. Oslo, sept. 18-21, 2012.  In-situ remediation of TCE by ERD in clay tills. Feasibility and performance of full-scale application insights gained through an integrated investigative approach for 2 sites.   Mette M. Broholm1, Ida Damgaard1, Julie Chambon1, Gabriele Manoli1, Dorte M. Pade1, Camilla Christiansen1, Phillip J. Binning1, Claus Westergaard2, Aikaterini Tsitonaki2, Mette Christophersen3, Henriette Kerrn-Jespersen4 and Poul L. Bjerg1   1Technical University of Denmark, Kgs. Lyngby, Denmark, 2Orbicon A/S, Roskilde, Denmark, 3Region of Southern Denmark, Vejle, Denmark, 4Capitol Region of Denmark, Hillerød, Den-mark mmbr@env.dtu.dk  Background/Aim.  Remediation of trichloroethene (TCE) in clay and other low permeability geologic media, where groundwater flow occurs preferentially in higher permeability sand lenses or fractures, is a significant challenge. At older sites, much of the contaminant mass is present as a sorbed phase in the matrix due to matrix diffusion. The principal challenge for in situ reme-diation in clay is to achieve effective contact between contaminant and bioremediation addi-tives (e.g., organic electron donors and bioaugmentation cultures). The feasibility and per-formance of full-scale applications of ERD in clay tills were investigated in a research project including 2 sites in Denmark undergoing remediation since 2006.  Project.  At the Sortebrovej site an emulsified oil donor (EOS) and a bioaugmentation culture (KB1®) with specific degraders Dehalococcoides were injected in a network of screened wells and spread in natural sand stringers embedded in the clay till. At the Gl. Kongevej site organic molasses donor and Bioclear Dechlorinating bioaugmentation culture with specific degraders Dehalococcoides were injected with a drive-point probe (Geoprobe) at 25 cm spaced vertical intervals in the clay till in a closely spaced network. An integrated investigative approach consisting of water and clay core sample analysis, including stable isotopes and specific de-graders, as well as analysis for chlorinated solvents, degradation products, donor fermenta-tion products and redox sensitive parameters combined with modelling was applied. Groundwater monitoring of selected wells was performed 2-3 times per year, and very de-tailed subsampling (on 0.25-5 cm scale) of the intact clay cores for matrix profile analysis was performed after 2 and 4 years. The transport including matrix diffusion and degradation in fractures/sand stringers and in bioactive zones in the clay till adjacent to the fractures/sand stringers was modelled to gain insight on the effects of sand stringer /fracture/injection spac-ing, thickness of bioactive zones, density/numbers of specific degraders, donor longevity, etc., on remediation efficiency and timeframes.   Results/Conclusions.  The results showed that the chlorinated solvent TCE was converted into its daughter prod-ucts (DCE, VC and ethene) but complete conversion of contaminants to ethene (as ex-pected) was not achieved in 4 years. Large variation in the effect of ERD in the clay matrix between sites, boreholes and even between cores was observed. After 4 years, the mass removal at the 2 sites varied between <5% and 50% within the treated zones. The limited efficiency of the bioremediation in terms of mass removal is due to the limited spatial extent of dechlorination. If degradation is restricted to narrow bioactive zones of a few cm develop-ing around fractures and sand stringers, contaminants in the remaining part of the matrix are not degraded and remediation efficiency is low due to the mass transfer limitations. However, the bioactive zones may expand in zones where both donor and chlorinated compounds are present. And in some cores TCE was depleted (degraded to DCE) in zones up to 1.8 m thick An extent, which could not be explained by diffusive loss to narrow bioactive zones. Hence, Abstract for NORDROCS 2012. The 4th Joint Nordic Meeting on Remediation of Contaminated Sites. Oslo, sept. 18-21, 2012.  biomass migration in the clay matrix appears to play an important role in terms of contami-nants mass reduction.  

In-situ remediation of TCE by ERD in clay tills. Feasibility and performance of full-scale application insights gained through an integrated investigative approach for 2 sites

http://orbit.dtu.dk/ws/files/51543462/prod21356711860026.Broholm_Abs_Nordrocs_2012_ERD.pdf

In-situ remediation of TCE by ERD in clay tills. Feasibility and performance of full-scale application insights gained through an integrated investigative approach for 2 sites

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