Abstract
This article describes an approach for quantifying microsphere deposition onto iron-oxide-coated sand
under the influence of adsorbed Suwannee River Humic Acid (SRHA). The experimental technique
involved a triple pulse injection of model latex microspheres (microspheres) in pulses of (1) microspheres, followed by (2) SRHA, and then (3) microspheres, into a column filled with iron-coated quartz sand as a water-saturated porous medium. A random sequential adsorption model (RSA) simulated the gradual rise in the first (microsphere) breakthrough curve (BTC). Using the same model calibration parameters a dramatic increase in concentration at the start of the second particle BTC, generated after SRHA injection, could be simulated by matching microsphere concentrations to extrapolated RSA output. RSA results and microsphere/SRHA recoveries showed that 1 mg of SRHA could block 5.90 plus or minus 0.14 x 10^9 microsphere deposition sites. This figure was consistent between experiments injecting different SRHA
masses, despite contrasting microsphere deposition/release regimes generating the second microsphere BTC.
Original language | English |
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Pages (from-to) | 3498-3506 |
Number of pages | 9 |
Journal | Environmental Pollution |
Volume | 158 |
Issue number | 12 |
DOIs | |
Publication status | Published - Oct 2010 |
ASJC Scopus subject areas
- Pollution
- Health, Toxicology and Mutagenesis
- Toxicology