Effect of DOC on contaminant fate and transport during the minicipal sewage treatment process

STPs是许多历史和新出现的有机污染物的环境负荷的重要来源。 这些负荷可能以污泥的形式作为生物固体施用在农业用地上，或作为最终流出物排放到接收水体中，通过各种接触途径直接影响人类和环境的有毒化学品剂量。与这些污染物有关的健康问题包括（但不限于）在食物链中可能的生物累积性、非致癌性和致癌性健康影响以及内分泌干扰的可能性。 与其他水生环境一样，有机物（固体和溶解的）在控制污水处理过程中有机污染物的命运以及由此产生的环境负荷方面发挥着重要作用。 然而，溶解有机碳（DOC）在污染物的命运过程中的作用知之甚少。 该项目旨在表征城市污水中存在的DOC，并量化其在处理过程中改变污染物命运的作用。 如本提案所设想的，更好地了解STP过程中污染物的归宿和迁移，将通过更好地控制污水处理过程，对人类和环境接触有毒有机污染物产生重大影响，从而减少环境负荷。 对污染物分解为各种形式的有机物的知识的提高还应导致制定新的战略、工艺选择，并查明处理所有有机污染物的数据差距，包括“现代”极性更强的有机污染物。这些结果也有望帮助科学界更好地了解DOC在其他各种环境基质（如天然沃茨、土壤和沉积物）中污染物动态中的作用。

STPs are a significant source of environmental loading for many organic contaminants of historical and emerging concern. These loadings, which may be in the form of sludge applied as biosolids on agricultural land or as final effluent discharged into receiving water bodies, directly affect toxic chemical dose of humans and the environment through various routes of exposure. The health concerns associated with these contaminants include (but not limited to) possible bioaccumulation in the food chain, non-carcinogenic and carcinogenic health effects, and potential for endocrine disruption. As in other aquatic environments, organic matter (solid and dissolved) plays an important role in controlling the fate of organic contaminants during the sewage treatment process, and the resulting environment loadings. However, the role of dissolved organic carbon (DOC) in contaminant fate during the process is poorly understood. This project is aimed at characterizing the DOC present in municipal sewage and quantifying the role it plays in altering contaminant fate during the treatment process. Better understanding of the fate and transport of contaminants during the STP process, as envisaged in this proposal, will significantly impact human and environmental exposure to toxic organic contaminants through better process control of the sewage treatment process, resulting in reduced environmental loadings. Improved knowledge of contaminant partitioning to various forms of organic matter should also lead to the development of new strategies, process options, and identify data gaps for dealing with all organic contaminants, including the "modern" more polar ones. The results are also expected to help the scientific community in better understanding the role of DOC in contaminant dynamics in various other environmental matrices, such as natural waters, soils and sediments.