Wednesday, November 7, 2007 - 10:20 AM
243-4

In-Situ Treatment of Non-Point Source Pollution Part 1: Concepts and Chemistry.

Chad Penn1, Ray Bryant2, Peter Kleinman2, Joshua McGrath3, and Arthur Allen4. (1) Oklahoma State University, Oklahoma State University/USDA-ARS, 367 Agricultural Hall, Stillwater, OK 74078, (2) USDA-ARS, Pasture Research Lab, Builiding 3702 Curtin Road, University Park, PA 16802-3702, (3) 0214 H.J. Patterson Hall, Bldg. 073, University of Maryland, University of Maryland, Dept. of Environmental Science & Technology, College Park, MD 20742-5825, (4) University of Maryland Eastern Shore, Univ. of Maryland E. Shore, 30921 Martin Court/crop & Aquaculture, Princess Anne, MD 21853

The loss of nutrients, particularly phosphorus (P), in agricultural and urban/suburban drainage waters is a priority conservation concern. Although several best management practices are effective in preventing particulate P losses to surface waters, they are less effective on dissolved P losses. Open channel ditches and sedimentation ponds concentrate drainage water from both runoff and subsurface flow offering an opportunity to remove non-point pollution generated across large areas of land. This study provides an overview of the potential to use P sorbing materials in surface water structures such as drainage ditches to sequester dissolved P. We describe factors affecting structure design and P sorbing material selection, such as chemical mechanisms of P removal, kinetics, physical properties, and potential contaminants in regard to use in treating surface waters. In addition, we will review several previously demonstrated P reduction/removal systems and potential alternative systems.