TY  - JOUR
A1  - Busch, Jan Philip
A1  - Meißner, Tobias
A1  - Potthoff, Annegret
A1  - Bleyl, Steffen
A1  - Georgi, Anett
A1  - Mackenzie, Katrin
A1  - Trabitzsch, Ralf
A1  - Werban, Ulrike
A1  - Oswald, Sascha Eric
T1  - A field investigation on transport of carbon-supported nanoscale zero-valent iron (nZVI) in groundwater
JF  - Journal of contaminant hydrology
N2  - The application of nanoscale zero-valent iron (nZVI) for subsurface remediation of groundwater contaminants is a promising new technology, which can be understood as alternative to the permeable reactive barrier technique using granular iron. Dechlorination of organic contaminants by zero-valent iron seems promising. Currently, one limitation to widespread deployment is the fast agglomeration and sedimentation of nZVI in colloidal suspensions, even more so when in soils and sediments, which limits the applicability for the treatment of sources and plumes of contamination. Colloid-supported nZVI shows promising characteristics to overcome these limitations. Mobility of Carbo-Iron Colloids (CIC) - a newly developed composite material based on finely ground activated carbon as a carrier for nZVI - was tested in a field application: In this study, a horizontal dipole flow field was established between two wells separated by 53 m in a confined, natural aquifer. The injection/extraction rate was 500 L/h. Approximately 12 kg of CIC was suspended with the polyanionic stabilizer carboxymethyl cellulose. The suspension was introduced into the aquifer at the injection well. Breakthrough of CIC was observed visually and based on total particle and iron concentrations detected in samples from the extraction well. Filtration of water samples revealed a particle breakthrough of about 12% of the amount introduced. This demonstrates high mobility of CIC particles and we suggest that nZVI carried on CIC can be used for contaminant plume remediation by in-situ formation of reactive barriers. (C) 2015 Elsevier B.V. All rights reserved.
KW  - Nanoscale zero-valent iron (nZVI)
KW  - Fe-C composite
KW  - Carbon colloid
KW  - Field aquifer
KW  - Remediation
KW  - Particle mobility
Y1  - 2015
U6  - https://doi.org/10.1016/j.jconhyd.2015.03.009
SN  - 0169-7722
SN  - 1873-6009
VL  - 181
SP  - 59
EP  - 68
PB  - Elsevier
CY  - Amsterdam
ER  -