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首页> 外文期刊>Environmental toxicology and chemistry >FATE OF OXYTETRACYCLINE IN STREAMS RECEIVING AQUACULTURE DISCHARGES: MODEL SIMULATIONS
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FATE OF OXYTETRACYCLINE IN STREAMS RECEIVING AQUACULTURE DISCHARGES: MODEL SIMULATIONS

机译：模型中水合流失的羟四环素的命运：模型模拟

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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).
机译：使用水质分析模拟程序（WASP，Ver 6.1）模型检查了从鱼类孵化场排放的溪流中土霉素的潜在水生生物。建模的4.4公里河网包括一个沉降池，一个接收段和两个下游段。在接收段和第一个下游段的沉积层中达到准稳态浓度（浓度变化，<7.5 mg kg〜（-1））需要几年。在沉降池，接收段，第一下游段和第二下游段中，水柱的中位数浓度（真正溶解以及与胶体和颗粒相关的浓度）分别为0、0.57、0.80和0.83 ng L〜（-1）。加药期间水柱中的真正溶解部分在沉淀池中为16％，在接收段中为64％，在河段中约为78％。在给药的1天内，根据所考虑的部分，浓度下降了20到400倍。停药后水柱中的真正溶解部分在沉淀池中为96％，在河段中约为78％。在给药期间，预期在接收段的沉积物结合浓度约为4 mg kg〜（-1），中位年浓度约为1.5 mg kg〜（-1）。下游沉积物中的预期浓度为0.2 mg kg〜（-1）或更低。敏感性分析表明，在模拟的水动力条件下，影响命运的最重要因素是沉降池中的生物固体负荷，生物固体沉降速度，来自生物固体的OTC净化动力学以及OTC河中的颗粒水分布系数。

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