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首页> 外文期刊>Environmental Science & Technology >Biodegradation Of 17β-estradiol, Estrone And Testosterone In Stream Sediments
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Biodegradation Of 17β-estradiol, Estrone And Testosterone In Stream Sediments

机译：河流沉积物中17β-雌二醇，雌酮和睾丸激素的生物降解

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Biodegradation of 17β-estradiol (E2), estrone (E1), and testosterone (T) was investigated in three wastewater treatment plant (WWTP) affected streams in the United States. Relative differences in the mineralization of [4-~(14)C] substrates were assessed in oxic microcosms containing saturated sediment or water-only from locations upstream and downstream of the WWTP outfall in each system. Upstream sedimentdemonstrated significant mineralization of the "A" ring of E2, El, and T, with biodegradation of T consistently greater than that of E2 and no systematic difference in E2 and E1 biodegradation. "A" ring mineralization also was observed in downstream sediment, with E1 and T mineralization being substantially depressed relative to upstream samples. In marked contrast, E2 mineralization in sediment immediately downstream from the WWTP outfalls was more than double that in upstream sediment. E2 mineralization was observed in water, albeit at insufficient rate to prevent substantial downstream transport. The results indicate that, in combination with sediment sorption processes which effectively scavenge hydrophobic contaminants from the water column and immobilize them in the vicinity of the WWTP outfall, aerobic biodegradation of reproductive hormones can be an environmentally important mechanism for noncon-servative (destructive) attenuation of hormonal endocrine disrupters in effluent-affected streams.
机译：在美国三个受污水处理厂（WWTP）影响的溪流中研究了17β-雌二醇（E2），雌酮（E1）和睾丸激素（T）的生物降解。在每个系统中污水处理厂排污口上游和下游的含饱和沉积物或仅含水的含氧微观世界中，评估了[4-〜（14）C]底物矿化的相对差异。上游沉积物显示出E2，E1和T的“ A”环明显矿化，T的生物降解始终大于E2，并且E2和E1的生物降解没有系统性差异。在下游沉积物中也观察到“ A”形环矿化作用，相对于上游样品，E1和T矿化作用明显降低。与之形成鲜明对比的是，污水处理厂污水口下游的沉积物中的E2矿化量比上游沉积物中的E2矿化量大一倍以上。在水中观察到E2矿化，尽管其速率不足以阻止大量下游运输。结果表明，结合有效清除水柱中疏水性污染物并将其固定在污水处理厂排污口附近的沉积物吸附过程，生殖激素的有氧生物降解可能是非保守（破坏性）衰减的环境重要机制。受污水影响的河流中的激素内分泌干扰物。

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