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Degradation and transport pathways of steroid hormones from human and animal waste.

机译：人类和动物废物中甾体激素的降解和运输途径。

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摘要

Steroid hormones have been widely detected in various environmental matrices, including soils, groundwater, surface water, and sediments. Agricultural operations where manure and biosolids are applied as fertilizers and soil amendments are potential sources of steroid hormones to the environment. The aim of this research is to assess the potential for surface runoff and to elucidate biodegradation pathways of steroid hormones from human and animal waste, respectively.;A field-scale study was conducted to assess the potential for runoff of seventeen different steroid hormones from an agricultural field applied with biosolids at an agronomic rate and the major runoff mechanisms. Steroid hormones were present in runoff from the biosolids amended agricultural field, and high concentrations of androgens and progesterone were observed in the runoff even after multiple rainfall events and up to one month after biosolids application. The observed correlation between rainfall amount and hormone mass flux suggests that intense rainfall promotes hormone runoff. Hormones were found to be transported primarily in the aqueous phase or by particles smaller than 0.7 microm.;The potential for biodegradation of testosterone, 17beta-estradiol and progesterone by swine (Sus scrofa) manure-borne bacteria was examined, and the impact of different environmental factors on testosterone degradation kinetics was determined. Testosterone, 17beta-estradiol and progesterone were rapidly degraded under aerobic conditions, and testosterone has the potential for degradation by manure-borne bacteria under a wide range of environmentally relevant conditions.;Finally, a study was conducted to enrich manure-borne bacteria capable of testosterone degradation and to elucidate the testosterone mineralization pathway by the enriched bacteria under aerobic conditions. Six DNA sequences of bacteria from the Proteobacteria phylum were identified in a testosterone-degrading enriched culture, suggesting that Proteobacteria may play an important environmental role in the degradation of testosterone and other similar structural compounds. The microbial enrichment caused 48% of the added 14C-testosterone to be mineralized to 14CO2 within 8 days of incubation.;The findings in this dissertation contribute important information that will help improve our current understanding of the environmental fate of steroid hormones as well as assist in the development of best management practices for biosolids and manure.
机译：类固醇激素已在各种环境基质中被广泛检测，包括土壤，地下水，地表水和沉积物。将肥料和生物固体用作肥料和土壤改良剂的农业生产活动是环境中类固醇激素的潜在来源。这项研究的目的是评估地表径流的潜力，并阐明人类和动物废物中类固醇激素的生物降解途径。;进行了实地规模研究，以评估来自动物粪便中的17种不同类固醇激素的径流潜力。农业领域以农艺速率和主要径流机制施用生物固体的农田。类固醇经过改良的农业生产地的径流中存在类固醇激素，即使在多次降雨事件之后以及施用生物固体后长达一个月的时间里，在径流中仍观察到高浓度的雄激素和孕酮。降雨量与激素质量通量之间的相关性表明，强降雨促进激素径流。发现激素主要通过水相或小于0.7微米的颗粒运输;研究了猪粪（Sus scrofa）粪便传播的细菌对睾丸激素，17β-雌二醇和孕酮的生物降解潜力，并研究了不同物质的影响确定了影响睾丸激素降解动力学的环境因素。在有氧条件下，睾丸激素，17β-雌二醇和孕酮迅速降解，睾丸激素在广泛的环境相关条件下具有被粪便传播的细菌降解的潜力。在有氧条件下，通过富集细菌降解睾丸激素并阐明睾丸激素矿化途径。在降解睾丸激素的富集培养物中鉴定出了来自Proteobacteria phylum的细菌的六个DNA序列，这表明Proteobacteria可能在降解睾丸激素和其他类似结构化合物中起重要的环境作用。微生物富集导致孵育后8天内48％的添加的14C-睾丸激素矿化为14CO2。本论文的发现提供了重要信息，将有助于增进我们对类固醇激素的环境命运的了解，并有助于在开发生物固体和肥料最佳管理方法方面。

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  • 作者

    Yang, Yun-Ya.;

  • 作者单位

    Colorado State University.;

  • 授予单位 Colorado State University.;
  • 学科 Environmental Sciences.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 192 p.
  • 总页数 192
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:36:56

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