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Onsite Wastewater System Nitrogen Contributions to Groundwater in Coastal North Carolina

机译：北卡罗莱纳州沿海地区的现场废水系统氮对地下水的贡献

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The objective of the study described in this article was to evaluate the nitrogen contributions from two onsite wastewater systems (sites 1 and 2) to groundwater and adjacent surface waters in coastal Beaufort County, North Carolina. Groundwater levels and water quality parameters including total nitrogen, nitrogen species, temperature, and pH were monitored from October 2009 to May 2010. Nitrogen was also tested in groundwater from deeper irrigation or drinking water wells from the two sites and six additional neighboring residences. Mean total nitrogen concentrations in groundwater beneath onsite wastewater systems 1 and 2 were 34.3 ± 16.7 mg/L and 12.2 ± 2.9 mg/L, respectively, and significantly higher than background groundwater concentrations (<1 mg/L). Groundwater in the deeper wells appeared not to be influenced by the onsite systems. Groundwater nitrogen concentrations typically decreased with distance down-gradient from the systems, but were still elevated relative to background conditions more than 15 m from the systems and near the estuary. This was a pioneering effort to better understand the link of onsite systems, the fate of nitrogen in the environment, and public health.
机译：本文所述研究的目的是评估北卡罗来纳州Beaufort县的两个现场废水系统（站点1和2）对地下水和邻近地表水的氮贡献。从2009年10月至2010年5月，监测了地下水位和水质参数，包括总氮，氮物种，温度和pH值。还对来自两个地点和另外六个邻近居民点的较深灌溉或饮用水井的地下水中的氮进行了测试。现场废水系统1和2下的地下水中的平均总氮浓度分别为34.3±16.7 mg / L和12.2±2.9 mg / L，显着高于背景地下水浓度（<1 mg / L）。更深井中的地下水似乎不受现场系统的影响。地下水中的氮浓度通常随着距系统距离的降低而降低，但是相对于距系统超过15 m且靠近河口的背景条件，地下水中的氮浓度仍会升高。这是一项开创性的工作，旨在更好地了解现场系统，环境中氮气的命运以及公共卫生之间的联系。

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