, Volume 24, Issue 4, pp 455–469 | Cite as

(Bio-)remediation of VCHC contaminants in a Technosol under unsaturated conditions

  • W. Baumgarten
  • H. Fleige
  • S. Peth
  • R. Horn
Original Paper


The remediation of dense non-aqueous phase liquids has always been a concern of both public and scientific interest groups. In this research work a modified physical concept of (bio)remediation of a volatile chlorinated hydrocarbon (VCHC) contamination was elaborated under laboratory conditions and modeled with HYDRUS-2D. In field dechlorination is influenced by both physicochemical and hydraulic properties of the substrate, e.g. texture, pore size distribution, pore liquid characteristics, e.g. viscosity, pH, surface tension, and dependent on the degree of saturation of the vadose zone. Undisturbed soil cores (100 cm³) were sampled from a Spolic Technosol. Considering hydraulic properties and functions, unsaturated percolation was performed with vertically and horizontally structured samples. VCHC concentrations were calculated prior, during, and after each percolation cycle. According to laboratory findings, microemulsion showed the most efficient results with regard to flow behavior in the unsaturated porous media and its accessibility for bacteria as nutrient. The efficiency of VCHC remediation could be increased by the application of a modified pump-and-treat system: the injection of bacteria Dehalococcoides ethanogenes with microemulsion, and extraction at a constant matric potential level of −6 kPa. Achieved data was used for HYDRUS-2D simulations, modeling in situ conditions, demonstrating the practical relevance (field scale) of performed unsaturated percolation (core scale), and in order to exclude capillary barrier effects.


Unsaturated percolation Soil structure Anisotropy Volatile chlorinated hydrocarbons (VCHC) Spolic Technosol HYDRUS-2D 



The first author and the co-authors thank the Biesterfeld Company for their financial support. A special thank is dedicated to Prof. Dr. Herges of the Institute of Organic Chemistry, CAU Kiel for his scientific support in the laboratory, and all technical assistants, who were involved into this project, and J. Rostek, Institute for Plant Nutrition and Soil Science, CAU Kiel for his technical support.


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Copyright information

© Springer Science+Business Media Dordrecht 2012

Authors and Affiliations

  1. 1.Institute for Plant Nutrition and Soil ScienceChristian-Albrechts-University zu KielKielGermany

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