Guar gum coupled microscale ZVI for in situ treatment of CAHs: continuous-flow column study

Journal of Hazardous Materials
Milica VelimirovicLeen 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 ...Continue Reading

References

Jun 17, 1999·Journal of Hazardous Materials·S R DayL Marsden
Jan 11, 2003·Environmental Science & Technology·Woojin Lee, Bill Batchelor
Aug 26, 2003·Journal of Contaminant Hydrology·Dirk SchäferAndreas Dahmke
Oct 6, 2005·Environmental Science & Technology·Eric J Reardon
Oct 21, 2006·Environmental Science & Technology·Yueqiang Liu, Gregory V Lowry
Aug 6, 2008·Environmental Science & Technology·Changha LeeDavid L Sedlak
Dec 1, 2009·Environmental Science & Technology·Elena Dalla VecchiaRajandrea Sethi
Jan 6, 2011·Environmental Science & Technology·Zhenqing ShiPaul G Tratnyek
Mar 6, 2012·Water, Air, and Soil Pollution·Chicgoua NoubactepRichard Crane
Oct 11, 2012·Journal of Contaminant Hydrology·Milica VelimirovicLeen Bastiaens

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Citations

Jun 27, 2014·Environmental Science and Pollution Research International·Liang ZhuXiangyang Xu
Aug 31, 2017·Environmental Science and Pollution Research International·Fenglin TangOlaf Kolditz
Nov 8, 2014·Environmental Science & Technology·Jordi PalauDaniel Hunkeler

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