Transport in porous media of highly concentrated iron micro- and nanoparticles in the presence of xanthan gum

Environmental Science & Technology
Elena Dalla VecchiaRajandrea Sethi

Abstract

The ability of xanthan gum to act as a delivery vehicle for the transport in porous media of highly concentrated nano- and microscale zerovalent iron (NZVI and MZVI, respectively) slurries was investigated. Sand-packed column experiments were performed injecting iron suspensions at a concentration of 20 g/L, amended with xanthan gum (3 g/L), at different ionic strength values (6 x 10(-3) mM or 12.5 mM) in 0.46 m long columns. Breakthrough curves of iron, obtained by in-line continuous measurement of magnetic susceptibility, under each experimental condition showed that normalized elution concentration at the end of the injection (i.e., after 7 or 26 pore volumes) is higher for MZVI (>0.94) than for NZVI (>0.88). Additional susceptibility measurements along the column and pressure drop also confirmed that MZVI is more easily eluted than NZVI. Moreover, water flushing after the iron injection phase lead to recoveries of over 95% for MZVI, and over 92% for NZVI of the total injected iron mass. The tests proved that xanthan gum is an excellent stabilizing agent and delivery vehicle of ZVI particles and has a high potential for use in real scale remediation interventions.

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Citations

Mar 7, 2014·Journal of Colloid and Interface Science·Francesca GastoneRajandrea Sethi
Feb 24, 2012·Environmental Science & Technology·Tiziana ToscoRajandrea Sethi
Nov 21, 2012·Environmental Science & Technology·Erica PensiniDenis O'Carroll
Dec 18, 2013·Journal of Hazardous Materials·Milica VelimirovicLeen Bastiaens
Nov 26, 2015·The Science of the Total Environment·Milica VelimirovicThilo Hofmann
Dec 25, 2012·Journal of Contaminant Hydrology·Chris M KocurBrent E Sleep
Oct 11, 2012·Journal of Contaminant Hydrology·Milica VelimirovicLeen Bastiaens
Mar 29, 2011·Journal of Hazardous Materials·Tao Long, C Andrew Ramsburg
Oct 19, 2010·Journal of Hazardous Materials·Silvia CombaRajandrea Sethi
Oct 27, 2015·Journal of Contaminant Hydrology·Ahmed I A ChowdhuryDenis M O'Carroll
Apr 7, 2015·Journal of Contaminant Hydrology·Zhenqing ShiKenneth H Williams
Apr 14, 2016·Environmental Science and Pollution Research International·Jun HanHaibing Shao
Feb 11, 2015·Journal of Colloid and Interface Science·Francesca MessinaRajandrea Sethi
Dec 19, 2014·Environmental Health and Toxicology·Min-Hee JangYu Sik Hwang
Jun 10, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Jing LiSubhasis Ghoshal
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Jun 13, 2015·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Zhangmei YangTsang Pokeung
Jan 10, 2020·Environmental Science and Pollution Research International·Cleomar ReginattoKrishna R Reddy
Aug 4, 2015·Environmental Science and Pollution Research International·Tanapon PhenratGregory V Lowry
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Jul 21, 2017·Environmental Science and Pollution Research International·Yunsong LiuYandan Shi
Feb 23, 2017·Environmental Science and Pollution Research International·Naresh KumarJean-Yves Bottero

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