title: Fate of oxytetracycline in streams receiving aquaculture discharges: model simulations.
abstract: The potential aquatic fate of oxytetracycline (OTC) in streams receiving discharge from fish hatcheries was examined using the Water-Quality Analysis Simulation Program (WASP, Ver 6.1) model. The modeled 4.4-km stream network included a settling pond, a receiving segment, and two downstream segments. Attainment of quasi-steady state concentrations (concentration variation, <7.5 mg kg(-1)) in the sediment layers of the receiving segment and first downstream segment required several years. Median water-column concentrations (truly dissolved and colloid- and particle-associated) were 0, 0.57, 0.80, and 0.83 ng L(-1) in the settling pond, receiving segment, first downstream segment, and second downstream segment. Truly dissolved fractions in the water column during dosing were 16% in the settling pond, 64% in the receiving segment, and approximately 78% in the river segments. Concentrations declined 20- to 400-fold, depending on the segment considered, within 1 d of dosing. Truly dissolved fractions in the water column after cessation of dosing were 96% in the settling pond and approximately 78% in the river segments. Expected sediment-bound concentrations were approximately 4 mg kg(-1) in the receiving segment during dosing, with a median annual concentration of approximately 1.5 mg kg(-1) . Expected concentrations in downstream sediments were 0.2 mg kg(-1) or less. Sensitivity analyses indicated the most important factors influencing fate under the hydrodynamic conditions simulated were settling-pond biosolids load, biosolids settling velocity, OTC depuration kinetics from biosolids, and OTC river particle-water distribution coefficient(s).
authors.affiliation: River Studies Center, University of Wisconsin, La Crosse, Wisconsin 54601, USA.
authors.forename: Peter E
authors.initials: PE
authors.lastname: Rose
authors.forename: Joel A
authors.initials: JA
authors.lastname: Pedersen
mesh_terms: D000900:Anti-Bacterial Agents / Q000032:analysis*; D017756:Aquaculture; D003198:Computer Simulation; D017753:Ecosystem; D005618:Fresh Water / Q000737:chemistry*; D019015:Geologic Sediments / Q000737:chemistry; D008956:Models, Chemical; D010118:Oxytetracycline / Q000032:analysis*; D012621:Seasons; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D000900:Anti-Bacterial Agents; D014874:Water Pollutants, Chemical; D010118:Oxytetracycline