Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing, 400067, China.
Shenzhen Key Laboratory of Marine Bioresource and Eco-environmental Science, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, 518060, China.
Chemosphere. 2020 Jan;239:124790. doi: 10.1016/j.chemosphere.2019.124790. Epub 2019 Sep 6.
Disinfection by-products (DBPs) play a significant role in human health. Identification of the precursor of DBPs, which constitutes dissolved organic matter (DOM), can help optimize the processes in a drinking water treatment plant (DWTP). This is very important for obtaining more safe water. In this context, a one-year study was performed in a DWTP. Fluorescence spectra of DOM were quantified for determining DOM composition and properties, and the corresponding DBPs formation was analyzed. Hydrophobic neutral and acidic compounds were found to be the two predominant substances forming DBPs, which also were dominant in the DOM. Coagulation and sedimentation were not effective in DOM elimination. Besides, sand filtration caused organic compounds to increase by 14.8% on average, especially 28.59% for aromatic protein II and 18.7% for soluble microbial product-like compounds, which was due to metabolism by microorganisms present in the filter. Carbonaceous DBPs were elevated from 34.8 μg/L in source water to 42.5 μg/L in effluent, along with organic compounds increasing in filtration, and nitrogenous DBPs were under detection in winter. All DBPs appeared at a high level in summer. Accordingly, enhanced coagulation process and measures that can avoid the release of organic compounds during filtration have been suggested. As the source water was rarely affected by human activities in the study area and owing to the wide use of traditional treatment process, the data of this research can be regarded as environmental background values and the results are considered as a significant reference.
消毒副产物（DBPs）在人类健康中起着重要作用。鉴定 DBPs 的前体物质，即溶解有机物（DOM），可以帮助优化饮用水处理厂（DWTP）的处理工艺。这对于获得更安全的水非常重要。在这种情况下，在 DWTP 进行了为期一年的研究。通过量化 DOM 的荧光光谱来确定 DOM 的组成和性质，并分析相应的 DBPs 形成情况。研究发现，疏水性中性和酸性化合物是形成 DBP 的两种主要物质，它们也是 DOM 中的主要物质。混凝和沉淀对 DOM 的去除效果不佳。此外，砂滤会导致有机化合物平均增加 14.8%，特别是芳香蛋白 II 增加了 28.59%，可溶性微生物产物样化合物增加了 18.7%，这是由于过滤器中存在的微生物的代谢作用。碳质 DBPs 从源水中的 34.8μg/L 升高到出水中的 42.5μg/L，同时过滤过程中有机化合物增加，冬季氮质 DBPs 未检出。所有 DBPs 在夏季均处于较高水平。因此，建议采用强化混凝工艺和可以避免在过滤过程中释放有机化合物的措施。由于研究区域的水源很少受到人类活动的影响，并且由于传统处理工艺的广泛应用，本研究的数据可以视为环境背景值，结果可以作为重要的参考依据。
