Bioaugmentation Mitigates the Impact of Estrogen on Coliform-Grazing Protozoa in Slow Sand Filters.
Bioaugmentation Mitigates the Impact of Estrogen on Coliform-Grazing Protozoa in Slow Sand Filters.
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DOI：
10.1021/acs.est.5b05027
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发表时间：
2016-03-15
影响因子：
11.4
通讯作者：
Quince C
中科院分区：
文献类型：
--
作者：
Haig SJ;Gauchotte-Lindsay C;Collins G;Quince C
接触内分泌干扰化学品（EDCs），如雌激素，对人类和动物健康来说是一个日益严重的问题，因为它们已被证明会导致野生动物和植物的生殖和发育异常，并与人类男性不育症有关。集约化农业和天气事件，如风暴、山洪暴发和山体滑坡，将雌激素贡献给用于供应饮用水的水道。本文探讨了雌激素暴露对用于水处理的慢砂过滤器（SSFs）性能的影响。研究了雌激素降解菌生物增强SSF的可行性和有效性，以确定是否可以提高天然雌激素（雌酮、雌二醇和雌三醇）的去除率和饮用水处理SSF的整体性能。扩增SSF的菌株是从全尺寸的市政SSF中分离出来的，以优化实验室规模SSF的存活率。通过气相色谱-质谱联用（GC-MS）测定的天然雌激素浓度显示，增强的SSFs使供水的总体雌激素效力平均降低了25%，并且比未增强的过滤器去除了更多的雌酮和雌二醇。在非增强过滤器中，大肠菌群去除与雌激素浓度呈负相关。这是由于原生动物的毒性抑制，表明高浓度雌激素可能对ssf具有功能影响（如损害大肠菌群的清除）。因此，我们认为高浓度雌激素会显著影响水质生产，特别是对生物滤水器中的病原体去除。
Exposure to endocrine-disrupting chemicals (EDCs), such as estrogens, is a growing issue for human and animal health as they have been shown to cause reproductive and developmental abnormalities in wildlife and plants and have been linked to male infertility disorders in humans. Intensive farming and weather events, such as storms, flash flooding, and landslides, contribute estrogen to waterways used to supply drinking water. This paper explores the impact of estrogen exposure on the performance of slow sand filters (SSFs) used for water treatment. The feasibility and efficacy of SSF bioaugmentation with estrogen-degrading bacteria was also investigated, to determine whether removal of natural estrogens (estrone, estradiol, and estriol) and overall SSF performance for drinking water treatment could be improved. Strains for SSF augmentation were isolated from full-scale, municipal SSFs so as to optimize survival in the laboratory-scale SSFs used. Concentrations of the natural estrogens, determined by gas chromatography coupled with mass spectrometry (GC-MS), revealed augmented SSFs reduced the overall estrogenic potency of the supplied water by 25% on average and removed significantly more estrone and estradiol than nonaugmented filters. A negative correlation was found between coliform removal and estrogen concentration in nonaugmented filters. This was due to the toxic inhibition of protozoa, indicating that high estrogen concentrations can have functional implications for SSFs (such as impairing coliform removal). Consequently, we suggest that high estrogen concentrations could impact significantly on water quality production and, in particular, on pathogen removal in biological water filters.