Field assessment of guar gum stabilized microscale zerovalent iron particles for in-situ remediation of 1,1,1-trichloroethane
- Autor(en)
- Milica Velimirovic, Tiziana Tosco, Maarten Uyttebroek, Michela Luna, Franceca Gastone, Cjestmir De Boer, Norbert Klaas, Hans Sapion, Heinrich Eisenmann, Per-Olof Larsson, Juergen Braun, Rajandrea Sethi, Leen Bastiaens
- Abstrakt
A pilot injection test with guar gum stabilized microscale zerovalent iron (mZVI) particles was performed at test site V (Belgium) where different chlorinated aliphatic hydrocarbons (CAHs) were present as pollutants in the subsurface. One hundred kilograms of 56 μm-diameter mZVI (~ 70 g L− 1) was suspended in 1.5 m3 of guar gum (~ 7 g L− 1) solution and injected into the test area. In order to deliver the guar gum stabilized mZVI slurry, one direct push bottom-up injection (Geoprobe) was performed with injections at 5 depths between 10.5 and 8.5 m bgs. The direct push technique was preferred above others (e.g. injection at low flow rate via screened wells) because of the limited hydraulic conductivity of the aquifer, and to the large size of the mZVI particles. A final heterogeneous distribution of the mZVI in the porous medium was observed explicable by preferential flow paths created during the high pressure injection. The maximum observed delivery distance was 2.5 m. A significant decrease in 1,1,1-TCA concentrations was observed in close vicinity of spots where the highest concentration of mZVI was observed. Carbon stable isotope analysis (CSIA) yielded information on the success of the abiotic degradation of 1,1,1-TCA and indicated a heterogeneous spatio-temporal pattern of degradation. Finally, the obtained results show that mZVI slurries stabilized by guar gum can be prepared at pilot scale and directly injected into low permeable aquifers, indicating a significant removal of 1,1,1-TCA.
- Organisation(en)
- Externe Organisation(en)
- Politecnico di Torino, Flemish Institute for Technological Research (VITO), Universität Stuttgart, SAPION bvba, ISODETECT, Höganäs AB
- Journal
- Journal of Contaminant Hydrology
- Band
- 164
- Seiten
- 88-99
- Anzahl der Seiten
- 12
- ISSN
- 0169-7722
- DOI
- https://doi.org/10.1016/j.jconhyd.2014.05.009
- Publikationsdatum
- 06-2014
- Peer-reviewed
- Ja
- ÖFOS 2012
- 104023 Umweltchemie, 104002 Analytische Chemie, 105904 Umweltforschung, 210006 Nanotechnologie
- Schlagwörter
- ASJC Scopus Sachgebiete
- Water Science and Technology, Environmental Chemistry
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/field-assessment-of-guar-gum-stabilized-microscale-zerovalent-iron-particles-for-insitu-remediation-of-111trichloroethane(9fe84ad2-c085-4a4e-8319-2fa469e021a0).html