1a.Objectives (from AD-416):
1) Develop a vegetative treatment system to treat runoff from a beef cattle feedlot;. 2)operate the system in conjunction with a real-world production environment;. 3)evaluate the effectiveness of the treatment system to remove nutrients, pathogens, and pharmaceutical compounds from the runoff.
1b.Approach (from AD-416):
An eight cell vegetative treatment area will be used to treat runoff from a beef cattle feedlot. Feedlot runoff water collected in small basins will be pumped onto the cells at defined rates, and water and soil samples will be collected. Experiments with clean groundwater will also be used to examine the effect of clean rainfall runoff from the cells.
Soil samples from sites distributed across the vegetative treatment system were analyzed for a suite of pharmaceutical compounds and steroids by UNL collaborators. Of seventeen possible pharmaceutical compounds, only three were routinely detected. These included chlorotetracycline, monensin, and tetracycline. Tylosin was detected in a single sample. For steroids, 4-Androstenedione and progesterone were consistently detected. Across the depth profile, concentrations of pharmaceutical compounds and hormones were greatest at the surface and decreased rapidly to a depth of 50 cm. Typically, detection of pharmaceuticals and hormones was only to a depth of 30 cm.