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Identification of wastewater-specific peak on EEM and their application for detecting the effluent in the discharged area
Water Research ( IF 11.4 ) Pub Date : 2025-01-28 , DOI: 10.1016/j.watres.2025.123213
Kazuhiro Komatsu, Takashi Onodera, Kenji Tsuchiya, Ayato Kohzu, Kazuaki Syutsubo

Excitation emission matrix (EEM) of fluorescence intensity has been often used to characterize dissolved organic matter in the aquatic environment. On EEM, there is a peak (Peak X) around excitation (emission) wavelengths of 490 (520) nm that is detected only in municipal wastewater-related samples. Peak X has been reported in very few papers. We investigated the characteristics of substances associated with Peak X from various perspectives. Based on that information, we hypothesized that Peak X was derived from fluorescein. This hypothesis was supported by the results of several estimates in this study, and it was revealed for the first time that Peak X on EEM was derived from fluorescein contained in colored bath salts widely used in Japan. We used Peak X to quantify how effluent from a wastewater treatment plant (WWTP) was dispersed in the outfall area of the plant and to evaluate its impact on the water quality to the area. By using Peak X, it was shown that the influence of the WWTP effluent on the discharged area extended several hundred meters. In other words, it was quantitatively demonstrated that the effluent significantly contributed to the increase in nutrient concentrations and primary production. These findings are expected to be highly useful for the control of nutrient concentrations in river water using the WWTP effluent, which has been the focus of much attention in recent years.

中文翻译:


识别 EEM 上的废水特异性峰值及其在检测排放区域污水中的应用



荧光强度的激发发射矩阵 (EEM) 通常用于表征水生环境中的溶解有机物。在 EEM 上,在 490 (520) nm 的激发(发射)波长附近有一个峰 (Peak X),仅在城市废水相关样品中检测到。X 峰在极少数论文中报道。我们从不同角度研究了与 Peak X 相关的物质的特性。根据该信息,我们假设 Peak X 来源于荧光素。这一假设得到了本研究中几个估计结果的支持,并且首次揭示了 EEM 上的峰 X 来源于日本广泛使用的有色浴盐中所含的荧光素。我们使用 Peak X 量化了污水处理厂 (WWTP) 的污水如何在工厂的排污口区域分散,并评估其对该地区水质的影响。通过使用 X 峰,表明 WWTP 污水对排放区域的影响延伸了数百米。换句话说,定量证明,流出物对营养物浓度和初级生产的增加做出了重大贡献。这些发现有望对使用 WWTP 污水控制水中的营养物浓度非常有用,这是近年来备受关注的焦点。
更新日期:2025-01-28
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