Jutaporn P, Laolertworakul W, Armstrong M D, Coronell O
Research Center for Environmental and Hazardous Substance Management, Department of Environmental Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen, 40002, Thailand E-mail:
Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
Water Sci Technol. 2019 Mar;79(5):820-832. doi: 10.2166/wst.2019.036.
This study investigated the applicability of fluorescence excitation-emission matrix spectroscopy (EEMS) to assess total trihalomethane formation potentials (TTHMFPs) and the ability of magnetic ion exchange (MIEX) resin to reduce TTHMFP. We treated a surface water and secondary wastewater effluent with MIEX mimicking full-scale operation by repeatedly exposing the same resin batch to additional feed water, with batches ranging from 500 to 5,000 resin bed volumes. Results showed that MIEX was more effective at removing or reducing ultraviolet absorbance (UVA), dissolved organic carbon (DOC), and TTHMFP in surface water than in secondary effluent. The greater UVA, DOC and TTHMFP removal for surface waters was explained by the stronger affinity of MIEX for terrestrial dissolved organic matter (DOM) compared to microbial DOM. Fluorescence EEMS results showed that the ratio between terrestrial and microbial fluorescent signals of DOM was significantly greater in surface water than in secondary effluent. Fluorescence surrogate parameters were strongly correlated with TTHMFP, namely, fluorescence intensity of humic-like peak C (R = 0.98, p < 0.01), protein-like peak T (R = 0.96, p < 0.01), and fulvic-like peak A (R = 0.87, p < 0.01). Correlations between fluorescence surrogate parameters and TTHMFP were substantially stronger than correlations between DOC and TTHMFP. Overall, the results indicate that fluorescent parameters extracted from EEMS data can be used as quick surrogate parameters to monitor TTHMFP for a diverse group of raw and MIEX-treated waters.
本研究调查了荧光激发-发射矩阵光谱法（EEMS）评估总三卤甲烷生成潜力（TTHMFPs）的适用性以及磁离子交换（MIEX）树脂降低TTHMFP的能力。我们通过将同一批树脂反复暴露于额外的进水来模拟全规模运行，用MIEX处理地表水和二级废水流出物，批次范围从500到5000树脂床体积。结果表明，与二级流出物相比，MIEX在去除或降低地表水中的紫外线吸光度（UVA）、溶解有机碳（DOC）和TTHMFP方面更有效。与微生物溶解有机物（DOM）相比，MIEX对陆地溶解有机物（DOM）具有更强的亲和力，这解释了地表水对UVA、DOC和TTHMFP的去除效果更好。荧光EEMS结果表明，地表水中DOM的陆地荧光信号与微生物荧光信号之比显著高于二级流出物。荧光替代参数与TTHMFP密切相关，即类腐殖质峰C的荧光强度（R = 0.98，p < 0.01）、类蛋白质峰T的荧光强度（R = 0.96，p < 0.01）和类富里酸峰A的荧光强度（R = 0.87，p < 0.01）。荧光替代参数与TTHMFP之间的相关性明显强于DOC与TTHMFP之间的相关性。总体而言，结果表明，从EEMS数据中提取的荧光参数可作为快速替代参数，用于监测各种原水和经MIEX处理的水中的TTHMFP。
