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Partitioning and toxicity of mercury, selenium, and arsenic in a constructed wetland for flue gas desulfurization wastewater treatment.

机译:汞,硒和砷在人工湿地中用于烟道气脱硫废水处理的分配和毒性。

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As fossil-fueled power plants attempt to comply with the Clean Air Act and Clean Water Act, cost-effective and ecologically-sound wastewater treatment systems such as constructed wetlands are being utilized across the nation. This research evaluated the partitioning and toxicity of Hg, Se, and As in a constructed wetland treatment system (CWTS) used to treat flue gas desulfurization (FGD) wastewater. The overall objective of the constructed wetland was to remove Hg, Se, and As from the receiving inflow by immobilizing these constituents within the wetland in order to achieve discharge limitations established by the National Pollution Discharge Elimination System (NPDES). In addition to treatment performance, it is essential to understand how performance is achieved, and the overall risks associated with the system and the incorporated processes to the surrounding ecosystem after treatment. Objectives were to (1) characterize the partitioning of Hg, Se, and As between water and detritus from the CWTS and consequent toxicity to Hyalella azteca Saussure, a common aquatic detritivore, (2) characterize sorption, root:shoot transfer, and bioconcentration of Hg, Se, and As in Schoenoplectus californicus and Typha angustifolia, (3) characterize the partitioning of Hg, Se, and As to sediment and consequent toxicity to H. azteca, and (4) categorize sediment-associated Hg, Se, and As into operationally-defined geochemical fractions using previously-developed sequential extraction procedures. In addition to contributing to the fundamental knowledge of the biogeochemistry of Hg, Se, and As, this research is essential to understanding the intricacies of constructed wetland treatment systems, as well as properly implementing these systems in the environment to effectively treat industrial wastewater.
机译:当化石燃料发电厂试图遵守《清洁空气法》和《清洁水法》时,全国各地都在使用具有成本效益和生态合理的废水处理系统,例如人工湿地。这项研究评估了用于处理烟气脱硫(FGD)废水的人工湿地处理系统(CWTS)中Hg,Se和As的分配和毒性。人工湿地的总体目标是通过将这些成分固定在湿地中来从接收的流入物中除去Hg,Se和As,以实现国家污染排放消除系统(NPDES)建立的排放限制。除了处理性能外,还必须了解如何实现性能,以及处理后与系统以及与周围生态系统的合并过程相关的总体风险。目的是(1)表征CWTS中水与碎屑之间的Hg,Se和As的分配以及对常见水生碎屑对透明质酸(Hyalella azteca Saussure)的后续毒性的特征;(2)表征Hg,Se和As的吸附,根:枝转移和生物富集Hg,Se和As分布于加利福尼亚的美加仑和香蒲中(3)表征Hg,Se和As对沉积物的分布及其对阿兹台克人的毒性,以及(4)对与沉积物相关的Hg,Se和As进行分类使用先前开发的顺序提取程序,将其定义为可操作定义的地球化学馏分。除了有助于了解Hg,Se和As的生物地球化学基础知识之外,这项研究对于理解人工湿地处理系统的复杂性以及在环境中正确实施这些系统以有效处理工业废水也至关重要。

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