Guar gum coupled microscale ZVI for in situ treatment of CAHs: Continuous-flow column study
- Author(s)
- Milica Velimirovic, Queenie Simons, Leen Bastiaens
- Abstract
A column study was performed under in-situ conditions to evaluate to which extend the inactivation of the microscale zerovalent iron (mZVI) by guar gum occurs under continuous flow conditions. Five aquifer containing columns were set up under different conditions. Efficient removal of trichloroethene was observed for the column amended by mZVI. Stabilization of the mZVI with guar gum led to slightly reduced activity. More reduced reactivity was observed in the poisoned column containing guar gum stabilized mZVI. This confirms that soil microorganisms can degrade guar gum and that subsequent removal of the oligosaccharides by the groundwater flow (flushing effect) can reactivate the mZVI. After more than six months of continuous operation the columns were dismantled. DNA-based qPCR analysis revealed that mZVI does not significantly affect the bacterial community, while guar gum stabilized mZVI particles can even induce bacterial growth. Overall, this study suggests that the temporarily decreased mZVI reactivity due to guar gum, has a rather limited impact on the performance of in-situ reactive zones. The presence of guar gum slightly reduced the reactivity of iron, but also slowed down the iron corrosion rate which prolongs the life time of reactive zone.
- Organisation(s)
- External organisation(s)
- Flemish Institute for Technological Research (VITO)
- Journal
- Journal of Hazardous Materials
- Volume
- 265
- Pages
- 20-29
- No. of pages
- 10
- ISSN
- 0304-3894
- DOI
- https://doi.org/10.1016/j.jhazmat.2013.11.020
- Publication date
- 01-2014
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 104023 Environmental chemistry, 104002 Analytical chemistry, 105904 Environmental research, 210006 Nanotechnology
- Keywords
- ASJC Scopus subject areas
- Pollution, Waste Management and Disposal, Health, Toxicology and Mutagenesis, Environmental Engineering, Environmental Chemistry
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/cc1a5293-076b-4414-99e8-6ef3622f6c27