Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 455-469 |
| Seitenumfang | 15 |
| Fachzeitschrift | BIODEGRADATION |
| Jahrgang | 24 |
| Ausgabenummer | 4 |
| Publikationsstatus | Veröffentlicht - Juli 2013 |
| Extern publiziert | Ja |
Abstract
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.
ASJC Scopus Sachgebiete
- Umweltwissenschaften (insg.)
- Environmental engineering
- Immunologie und Mikrobiologie (insg.)
- Mikrobiologie
- Chemische Verfahrenstechnik (insg.)
- Bioengineering
- Umweltwissenschaften (insg.)
- Umweltchemie
- Umweltwissenschaften (insg.)
- Umweltverschmutzung
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in: BIODEGRADATION, Jahrgang 24, Nr. 4, 07.2013, S. 455-469.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - (Bio-)remediation of VCHC contaminants in a Technosol under unsaturated conditions
AU - Baumgarten, W.
AU - Fleige, H.
AU - Peth, S.
AU - Horn, R.
PY - 2013/7
Y1 - 2013/7
N2 - 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.
AB - 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.
KW - Anisotropy
KW - HYDRUS-2D
KW - Soil structure
KW - Spolic Technosol
KW - Unsaturated percolation
KW - Volatile chlorinated hydrocarbons (VCHC)
UR - http://www.scopus.com/inward/record.url?scp=84878659285&partnerID=8YFLogxK
U2 - 10.1007/s10532-012-9601-6
DO - 10.1007/s10532-012-9601-6
M3 - Article
C2 - 23160773
AN - SCOPUS:84878659285
VL - 24
SP - 455
EP - 469
JO - BIODEGRADATION
JF - BIODEGRADATION
SN - 0923-9820
IS - 4
ER -