Persistence and removal of trace organic compounds in centralized and decentralized wastewater treatment systems
Persistence and removal of trace organic compounds in centralized and decentralized wastewater treatment systems
复制标题
集中式和分散式废水处理系统中痕量有机化合物的残留和去除
DOI：
10.1016/j.chemosphere.2021.131621
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发表时间：
2022
期刊：
影响因子：
8.8
通讯作者：
Hoh, Eunha
中科院分区：
文献类型：
--
作者：
Mladenov, Natalie;Dodder, Nathan G.;Steinberg, Lauren;Richardot, William;Johnson, Jade;Martincigh, Bice S.;Buckley, Chris;Lawrence, Tolulope;Hoh, Eunha
来自集中式污水处理厂（WWTPs）和分散式污水处理系统（DEWATS）的处理后的污水中的痕量有机化学品的持久性是令人关注的，因为它们对人类和生态系统健康的潜在影响。在这里，我们利用非靶向分析（NTA）与全面的二维气相色谱结合飞行时间质谱（GC × GC/TOF-MS）进行评估的共同持久性和删除的化合物中发现的两个集中的污水处理厂在美国和南非和一个DEWATS在南非。总体而言，去除效率的化学品处理厂之间是相似的，当他们进行比较，根据在每个处理厂的流入物和流出物中检测到的化学特征的数量。然而，DEWATS的处理列车，它具有较长的固体保留和水力停留时间比两个集中的污水处理厂，并利用主要的厌氧处理过程，能够去除13个额外的化合物，并显示出更大的减少归一化峰面积相比，集中的污水处理厂。在所有三种进水中初步确定的111种常见化合物中，有11种化合物在所有重复中都具有持久性，其中包括5种以前未在污水处理厂或水回用系统的废水中报告的化合物。有持久性和去除的化合物的物理化学性质之间没有显着差异，但观察到显着差异的分子描述符。这些结果对于集中式和分散式污水处理厂中微量有机化学物质的处理以及污水处理厂出水中新化合物的监测具有重要意义。
The persistence of trace organic chemicals in treated effluent derived from both centralized wastewater treatment plants (WWTPs) and decentralized wastewater treatment systems (DEWATS) is of concern due to their potential impacts on human and ecosystem health. Here, we utilize non-targeted analysis (NTA) with comprehensive two-dimensional gas chromatography coupled with time of flight mass spectrometry (GC × GC/TOF-MS) to conduct an evaluation of the common persistent and removed compounds found in two centralized WWTPs in the USA and South Africa and one DEWATS in South Africa. Overall, removal efficiencies of chemicals were similar between the treatment plants when they were compared according to the number of chemical features detected in the influents and effluents of each treatment plant. However, the DEWATS treatment train, which has longer solids retention and hydraulic residence times than both of the centralized WWTPs and utilizes primarily anaerobic treatment processes, was able to remove 13 additional compounds and showed a greater decrease in normalized peak areas compared to the centralized WWTPs. Of the 111 common compounds tentatively identified in all three influents, 11 compounds were persistent in all replicates, including 5 compounds not previously reported in effluents of WWTPs or water reuse systems. There were no significant differences among the physico-chemical properties of persistent and removed compounds, but significant differences were observed among some of the molecular descriptors. These results have important implications for the treatment of trace organic chemicals in centralized and decentralized WWTPs and the monitoring of new compounds in WWTP effluent.