Fate of trace organics in a wastewater effluent dependent stream
Fate of trace organics in a wastewater effluent dependent stream
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DOI：
10.1016/j.scitotenv.2015.02.074
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发表时间：
2015-06-15
影响因子：
9.8
通讯作者：
Arnold, Robert G.
中科院分区：
文献类型：
--
作者：
Dong, Bingfeng;Kahl, Alandra;Arnold, Robert G.
排入河流的生活污水中的痕量有机物对生态系统和人类健康具有潜在的威胁。本研究探讨了命运的一套TORC和雌激素活性的水和沉积物中的流出物依赖流在亚利桑那州图森市。在2011年至2013年期间，沿着圣克鲁斯河下游进行了采样活动，在水（表面）和固体（河床沉积物）相测量了TORCs和雌激素活性。一些TORC，包括雌激素活性的贡献者，在河流中旅行的距离迅速衰减。那些没有被充分衰减并渗透到地下水的TOC通常具有低生物降解概率和低辛醇-水分配比。独立的实验表明，雌激素化合物的衰减可能部分是由于吸收阳光形成有机自由基而引起的间接光解。在干旱天气期间，疏水性TOrCs可能会在河床沉积物中积累，但在暴雨和径流期间，河床沉积物质量会受到与风暴相关的冲刷的周期性影响。总的来说，有证据表明，自然过程至少可以减弱某些TOC，减少对生态系统和人类健康的潜在影响。(C)2015 Elsevier B. V.版权所有。
Trace organic compounds (TOrCs) inmunicipalwastewater effluents that are discharged to streams are of potential concern to ecosystem and human health. This study examined the fate of a suite of TOrCs and estrogenic activity in water and sediments in an effluent-dependent stream in Tucson, Arizona. Sampling campaigns were performed during 2011 to 2013 along the Lower Santa Cruz River, where TOrCs and estrogenic activitywere measured in aqueous (surface) and solid (riverbed sediment) phases. Some TOrCs, including contributors to estrogenic activity, were rapidly attenuated with distance of travel in the river. Those TOrCs that are not sufficiently attenuated and percolate to ground water have in common low biodegradation probabilities and low octanolwater distribution ratios. Independent experiments showed that attenuation of estrogenic compounds may be due in part to indirect photolysis caused by formation of organic radicals fromsunlight absorption. Hydrophobic TOrCs may accumulate in riverbed sediments during dry weather periods, but riverbed sediment quality is periodically affected through storm-related scouring during periods of heavy rainfall and runoff. Taken together, evidence suggests that natural processes can attenuate at least some TOrCs, reducing potential impacts to ecosystem and human health. (C) 2015 Elsevier B.V. All rights reserved.