Thursday 3:55 Chad J. Penn, USDA, Agricultural Research Service
Effectiveness of AMD Residuals in Reducing Phosphorus Concentrations in Runoff from Agricultural Soils
Chad J. Penn
Prevention of phosphorus (P) losses from agricultural land to surface waters is critical to water quality issues such as eutrophication. Residual materials resulting from acid mine drainage (AMD) neutralization were evaluated for their ability to reduce available P concentrations in soil, manure, and runoff. Other P sorbing amendments (gypsum, flyash, and water treatment residuals) were included in the evaluation. Soil P reduction was evaluated by amending three different soils at five different rates, incubating for two weeks, and extracting with Mehlich-3 and water. Manure P reduction was evaluated by conducting an isotherm involving the addition of each material to dairy, swine, and poultry manure at six different rates using a manure:solution ratio of 1:200 and shaking for 16 h before filtration and P analysis. Runoff boxes containing Othello soil were amended at the rate of 20 g 100g-1 soil and subjected to simulated rainfall applied at the rate of 7.5 cm hr-1. Runoff was collected and analyzed for dissolved P, total P, and sediment concentrations. Results showed that calcium, iron and aluminum rich AMD residuals were at least equally effective in reducing soil and runoff P concentrations compared to other materials, while manure P reductions varied based upon manure and material properties.
BiographyChad Penn received his B.S. in soil science from Penn State University in 1998, followed by a M.S. degree in environmental soil science from the University of Delaware (2001). His research at the University of Delaware involved studying the effects of wastewater treatment processes on the chemical properties of biosolids and the potential impact of those biosolids on water quality when land applied. While at Virginia Tech, he earned a Ph.D. in soil chemistry (2004) which involved research on predicting phosphorus concentrations in runoff based on soil properties, and the effect of soil mineralogy on phosphorus retention. He is currently working as a post-doctorate researcher at the USDA / ARS (agricultural research service) Pasture Systems and Watershed Management Research Unit, where his research involves determining the mechanisms of dissolved phosphorus losses in runoff, and reducing non-point losses of phosphorus to surface waters through the application of various industrial waste products.