Abstract
A laboratory study was conducted to investigate the single-bed anion exchange process for removal of NO 3-N from agricultural subsurface drain outflow. Tests were performed in duplicate at flow rates of 103 ml/min and 512 ml/min, respectively, using both synthetic and natural drainage water. Nitrate breakthrough occurred at nearly the same column volumes for both flow rates. Sulfate competed strongly for exchange sites decreasing the efficiency of the resin to adsorb nitrate. The anion exchange process has the potential for removing NO 3-N from drainage outflow, however several technical and economic problems must be solved before it can be applied in the field.
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