HR: 0800h
AN: H31F-1360    [Abstracts]
TI: Phosphorus Transport at a Wastewater Infiltration Site; Mines Park, CO
AU: * Doyle, S E
EM: sdoyle@mines.edu
AF: Environmental Science and Engineering Division Colorado School of Mines, 1500 Illinois St., Golden, CO 80401 United States
AU: McCray, J E
EM: jmccray@mines.edu
AF: Environmental Science and Engineering Division Colorado School of Mines, 1500 Illinois St., Golden, CO 80401 United States
AU: Thyne, G D
EM: gthyne@mines.edu
AF: Geology and Geological Engineering Department Colorado School of Mines, 1500 Illinois St., Golden, CO 80401 United States
AU: Lowe, K S
EM: klowe@mines.edu
AF: Environmental Science and Engineering Division Colorado School of Mines, 1500 Illinois St., Golden, CO 80401 United States
AB: Phosphorus (P) from onsite wastewater systems (OWSs) is often considered to be a water resources problem because it contributes to eutrophication of surface-water bodies. In mountainous watersheds, OWSs are commonly used, yet the P transport mechanisms are poorly understood. This study focuses on P transport directly below the OWS infiltrative surface at the Mines Park Test Site, a wastewater infiltration experimental site on the Colorado School of Mines campus. At this site, six soil samples were taken from a two-depth, 30ft long trench. These samples were analyzed by sorption batch tests to determine isotherm constants. The batch test results, combined with effluent composition data from the site, were used to create a 1-D reactive transport model using Geochemist's Workbench. By using the reactive transport model, both chemical precipitation of P compounds and P sorption onto soil were modeled. The resulting P breakthrough in the model was then compared to P concentrations in lysimeter samples from 2ft and 4ft below the infiltrative surface, taken after approximately two years of wastewater infiltration at the site.
DE: 1803 Anthropogenic effects (4802, 4902)
DE: 1831 Groundwater quality
DE: 1834 Human impacts
DE: 1865 Soils (0486)
SC: Hydrology [H]
MN: Fall Meeting 2005