Location: National Soil Erosion Research
Project Number: 5020-12000-015-01-R
Project Type: Reimbursable
Start Date: Dec 16, 2013
End Date: Aug 31, 2017
Develop fundamental knowledge and predictive tools to mitigate proliferation of pharmaceuticals and hormones from agricultural soils to surface waters. Specific objectives are: 1) determine sorption capacities of geosorbents (black carbon, soil amorphous organic matter, and clay minerals) for representative pharmaceuticals and hormones; 2) develop a mechanistic, predictive sorption model based on additive sorption by these geosorbents and validate this technique with whole soils and soils amended with biochars; 3) investigate the transport of fine-grained geosorbents in surface and shallow subsurface flows.
Sorption isotherm experiments will be conducted to determine sorption capacities of black carbon, biochars, and clay minerals for representative pharmaceuticals and hormones (e.g., lincosamides, sulfonamides, tetracyclines, ionophores, and hormones). Sorption models will be developed by mechanistically associating pharmaceutical and hormone sorption by component geosorbents to the sorption of pharmaceuticals and hormones in whole soils. Laboratory-scale rainfall simulations to investigate the biochar/Chemicals of Environmental Concern (CECs) on runoff water quality will be performed as follow: Soil amended with biochar and/or manure containing CECs will be subject to a sequence of 4 rainstorms simulations: 50, 25, 75, and 100 mm/h. The first storm is intended for the soil box to reach a steady state runoff and the four storm sequence is designed to derive a range of data for storm intensity, runoff and sediment production. To compare the amended soils, an unmended control treatment will be used as a basis for sediment losses. Runoff generated will be collected and the collected samples will be analyzed for runoff, sediment production, nutrient, biochar, CECs, dissolve organic carbon.