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首页> 外文期刊>Water Science and Technology >In situ continuous monitoring of nitrogen with ion-selective electrodes in a constructed wetland receiving treated wastewater: an operating protocol to obtain reliable data
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In situ continuous monitoring of nitrogen with ion-selective electrodes in a constructed wetland receiving treated wastewater: an operating protocol to obtain reliable data

机译:在接收处理过的废水中构造的湿地中具有离子选择性电极的离子选择性电极的原位连续监测:获得可靠数据的操作方案

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摘要

Constructed wetlands receiving treated wastewater (CWtw) are placed between wastewater treatment plants and receiving water bodies, under the perception that they increase water quality. A better understanding of the CWtw functioning is required to evaluate their real performance. To achieve this, in situ continuous monitoring of nitrate and ammonium concentrations with ion-selective electrodes (ISEs) can provide valuable information. However, this measurement needs precautions to be taken to produce good data quality, especially in areas with high effluent quality requirements. In order to study the functioning of a CWtw instrumented with six ISE probes, we have developed an appropriate methodology for probe management and data processing. It is based on an evaluation of performance in the laboratory and an adapted field protocol for calibration, data treatment and validation. The result is an operating protocol concerning an acceptable cleaning frequency of 2 weeks, a complementary calibration using CWtw water, a drift evaluation and the determination of limits of quantification (1 mgN/L for ammonium and 0.5 mgN/L for nitrate). An example of a 9-month validated dataset confirms that it is fundamental to include the technical limitations of the measuring equipment and set appropriate maintenance and calibration methodologies in order to ensure an accurate interpretation of data.
机译:接受处理过处理的废水(CWTW)的构造湿地放置在废水处理厂和接收水体之间,从而提高水质。需要更好地理解CWTW功能来评估其实际性能。为了实现这一点,原位将硝酸盐和铵浓度的连续监测离子选择性电极(ISE)可以提供有价值的信息。然而,这种测量需要采取预防措施来产生良好的数据质量,特别是在污水质量要求高的地区。为了研究具有六个ISE探针的CWTW的功能,我们开发了适当的探测管理和数据处理方法。它基于对实验室性能的评估和用于校准,数据处理和验证的适应性现场协议。结果是关于可接受的清洁频率的操作协议2周,使用CWTW水的互补校准,漂移评估和定量限制的测定(用于铵的1mgn / L和0.5mgn / L的硝酸盐)。 9个月验证数据集的一个例子确认它是包括测量设​​备的技术限制的基础,并设置适当的维护和校准方法,以确保准确地解释数据。

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