| Title: |
Pilot project for stimulated in-situ reductive dechlorination - main report
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| Resource Type: |
document --> technical publication --> report
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| Country: |
Denmark
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| Language(s): |
Danish
English
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| Year: |
2007 |
| Availability: |
Environmental project, Miljørapport nr. 1148
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| Author 1/Producer: |
Jørgensen, T.H
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| Other Authors/Producers: |
Nissen, L.; Nielsen, L.; Petersen, P.A.; Hansen, M.H.; Scheutz, C.; Jakobseb, R.; Bjerg, P.L.; Larsen, T.; Durant, N.D.;Cox, E. and Rasmussen, P.
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| Author / Producer Type: |
Agency, regulator or other governmental or inter-governmental body
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| Publisher: |
The Danish Environmental Protection Agency, Miljøstyrelsen
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| Publisher City: |
Strandgade 29, DK-1405 Copenhagen K, Denmark
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| ISBN: |
978-87-7052-366-
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| Format (e.g. PDF): |
PDF
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| Size: (e.g. 20mb) |
1.471
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EUGRIS Keyword(s): |
Contaminated land-->Contaminated land overview
Contaminated land-->Remediation options-->In situ treatment technologies
Contaminated land-->Remediation options-->Remediation options overview
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| Short description: |
An in-situ remediation technique using stimulated reductive dechlorination has been applied with promising results in a pilot scale system with recirculation at a Danish site heavily contaminated by chlorinated solvents. The pilot scale has been established in a secondary sandy aquifer overlaid by clay till.
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| Long description: |
Stimulated reductive dechlorination involving addition of donor (lactate, a carbon source) and bacteria has stimulated anaerobic dechlorination of chlorinated solvents in a sandy Danish aquifer. The process takes advantage of a sequential anaerobic transformation: Trichloroethene Dichloroethene Vinyl chloride Ethene/Ethane. Complete dechlorination is desired in order to form harmless ethene/ethane instead of toxic intermediates like vinyl chloride. Initially, cis-DCE dominated in all boreholes in the source area, but after 201 days, the dominating compounds were vinyl chloride and ethane. Prior to initiation of stimulated reductive degradation, the contents of DCE and VC downstream from the source were respectively 2,420 μg/l and 12 μg/l and after treatment, the contents were both respectively 21 µg/l. The pilot scale system was an active (forced gradient) system with recirculation covering an area of 40 m in flow direction and 20 m in width. Groundwater was extracted continuously (ca. 3,500 l/day) and injected into three injection wells. The groundwater pore flow velocity was ca. 0.5 m/day with a residence time of approximately 60 days. The most significant operational problems were due to backpressure caused by clogging. Selection of pumps, filtration of extracted groundwater and regeneration of borehole screens needs careful consideration.
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Submitted By:
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Dr Jacqueline Falkenberg WhoDoesWhat?
Last update: 13/04/2007
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