TY - JOUR
T1 - Application of an empirical transport model to simulate retention of nanocrystalline titanium dioxide in sand columns
AU - Choy, Christine Chin
AU - Wazne, Mahmoud
AU - Meng, Xiaoguang
PY - 2008/4
Y1 - 2008/4
N2 - Nanocrystalline titanium dioxide was injected into sand columns to simulate subsurface injection for creation of a permeable treatment barrier. Past usage of this material as an ex situ pilot scale treatment filter has shown that it has a high adsorption capacity for a number of heavy metals and therefore would be a good candidate for injection technology. Three suspension concentrations (50, 75 and 100 mg l-1) were pumped through packed sand columns at different flow velocities (3.0, 6.8 and 14.1 cm min-1). Little to no particles was detected in the effluent. Most of the nanoparticles remained in the sand columns, with an increasing then decreasing retained solids pattern. Application of a one-dimensional advection-dispersion flow model, that included two empirical kinetic terms to account for particle retention in the porous media, produced data fits that followed the general trend of the data, but did not truly capture the concentration maxima in the data sets. Discussion of these results highlights the limited ability of existing models to aid in predicting particle retention of non-ideal materials for engineering purposes.
AB - Nanocrystalline titanium dioxide was injected into sand columns to simulate subsurface injection for creation of a permeable treatment barrier. Past usage of this material as an ex situ pilot scale treatment filter has shown that it has a high adsorption capacity for a number of heavy metals and therefore would be a good candidate for injection technology. Three suspension concentrations (50, 75 and 100 mg l-1) were pumped through packed sand columns at different flow velocities (3.0, 6.8 and 14.1 cm min-1). Little to no particles was detected in the effluent. Most of the nanoparticles remained in the sand columns, with an increasing then decreasing retained solids pattern. Application of a one-dimensional advection-dispersion flow model, that included two empirical kinetic terms to account for particle retention in the porous media, produced data fits that followed the general trend of the data, but did not truly capture the concentration maxima in the data sets. Discussion of these results highlights the limited ability of existing models to aid in predicting particle retention of non-ideal materials for engineering purposes.
KW - Particle transport
KW - Passive chemical barrier
KW - Porous media
KW - TiO
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U2 - 10.1016/j.chemosphere.2007.12.030
DO - 10.1016/j.chemosphere.2007.12.030
M3 - Article
C2 - 18282593
AN - SCOPUS:41549134051
SN - 0045-6535
VL - 71
SP - 1794
EP - 1801
JO - Chemosphere
JF - Chemosphere
IS - 9
ER -