Veterinary pharmaceuticals are widely used in concentrated animal feeding operations (CAFOs). The potential loading of pharmaceutical residues into the environment from animal wastes associated with land application is receiving attention due to the fact that colloids derived from manure could affect transport of soil contaminants. This study revealed that florfenicol, a veterinary antibiotic, was recalcitrant in the manure-amended soils and that manure colloids could facilitate its transport. The colloid-facilitated transport of this antibiotic was further investigated using saturated sand and soil columns. A modified numerical advection-dispersion model using finite difference scheme was developed to fit the observed transport processes. The lumped effect of straining and sorption in the model on the transport process of florfenicol was also evaluated. The sorption coefficient of florfenicol in soils was obtained from its batch sorption experiment. The straining coefficient was estimated by subtracting the sorption from the lumped effect which was estimated from the modified model.

Colloid facilitated transport of veterinary pharmaceutical florfenicol in saturated sand and soil columns

244th National Meeting (2012)

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