Title: Stimulated in situ Reductive Dechlorination. Literature Survey and Screening of Potential Sites. Main Report 
Resource Type: document --> technical publication --> report 
Country: Denmark 
Language(s): Danish
English
 
Year: 2005 
Availability: Environmental project, Miljørapport nr. 983 
Author 1/Producer: Jørgensen, Thomas, Højbjerg 
Other Authors/Producers: Scheutz, Charlotte; Durant, Neal D.; Cox, Evan; Bordum, Niels Erik; Rasmussen, Poul; Bjerg, Poul Løgstrup 
Author / Producer Type: Agency, regulator or other governmental or inter-governmental body 
Publisher: The Danish Environmental Protection Agency, Miljøstyrelsen 
Publisher City: Strandgade 29, DK-1405 Copenhagen K, Denmark 
ISBN: 87-7614-527-1 
Report / download web link (=direct link): http://www2.mst.dk/common/Udgivramme/Frame.asp?pg=http://www ...  
Format (e.g. PDF): PDF 
Size: (e.g. 20mb) 884 
EUGRIS Keyword(s): Contaminated land-->Contaminated land overview
Contaminated land-->Remediation options-->In situ treatment technologies
Contaminated land-->Remediation options-->Remediation options overview
 
Short description: A literature review of international and national experience concerning the application of stimulated in situ reductive dechlorination at sites contaminated with chlorinated solvents. Development of a model for the initial site assessment of the applicability of stimulated in situ reductive dechlorination as a remediation technique. 
Long description: Key finding of the literature reviewed are presented in the appendix (report nr. 984). In situ reductive dechlorination may proceed naturally in contaminated ground water under anaerobe conditions, but is often limited by lack of electron donors. The process can be stimulated by addition of bacteria (Bioaugmentation) or electron donors (Biostimulation). Elektron donors can be lactate-based polymers (HRC), oil-based slow release compounds or soluble compounds such as alcohols etc. Under anaerobe conditions these compounds are fermented to the electron donor, hydrogen. Removal of free phase solvents is recommended before application of the technique. Both active and passive systems can be used in the groundwater zone. The active systems are more effective, but also are more difficult to control. The technique has mainly been used in sandy aquifers, but can be applied in fractured rock types. Experience with low permeable aquifers is limited. The bio augmentation technique can also be applied to aerobe groundwater systems, but is slow and requires establishment and maintenance of anaerobe conditions. A screening model to evaluate the most suitable sites for the application of the technique has been developed. The most important factors in the scoring system are hydraulic conductivity and the presence of degradation products. 
Submitted By: Dr Jacqueline Falkenberg WhoDoesWhat?      Last update: 05/02/2007