N-nitrosodimethylamine (NDMA) formation during ozonation of wastewater and water treatment polymers.
N-nitrosodimethylamine (NDMA) formation during ozonation of wastewater and water treatment polymers.
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DOI：
10.1016/j.chemosphere.2015.10.023
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发表时间：
2016-02
期刊：
影响因子：
8.8
通讯作者：
M. Sgroi;P. Roccaro;G. Oelker;S. Snyder
中科院分区：
文献类型：
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作者：
M. Sgroi;P. Roccaro;G. Oelker;S. Snyder
研究了臭氧氧化在四个污水处理厂的出水中生成N-亚硝基二甲胺(NDMA)的情况。在没有生物脱氮的处理厂的废水中观察到很高水平的NDMA形成。选定的实验表明，在臭氧氧化废水过程中，羟基自由基对NDMA的形成没有显著的作用。此外，臭氧氧化三种不同的水处理聚合物，包括聚DADMAC、阴离子聚丙烯酰胺和阳离子聚丙烯酰胺，在废水中的添加不会增加NDMA的形成。排出的有机物(EfOM)可能会减少臭氧在水中的有效性，能够与聚合物反应，并熄灭产生的·OH自由基，从而限制聚合物的降解和随后的NDMA生产。NDMA的形成、254 nm的紫外光吸光度和总荧光强度之间有很好的相关性。这些数据提供了证据，证明紫外线和荧光替代物可以用于监测和/或控制臭氧氧化过程中NDMA的形成。
N-Nitrosodimethylamine (NDMA) formation by ozonation was investigated in the effluents of four different wastewater treatment plants destined for alternative reuse. Very high levels of NDMA formation were observed in wastewaters from treatment plants non operating with biological nitrogen removal. Selected experiments showed that hydroxyl radical did not have a significant role in NDMA formation during ozonation of wastewater. Furthermore, ozonation of three different polymers used for water treatment, including polyDADMAC, anionic polyacrylamide, and cationic polyacrylamide, spiked in wastewater did not increase the NDMA formation. Effluent organic matter (EfOM) likely reduced the availability of ozone in water able to react with polymers and quenched the produced ·OH radicals which limited polymer degradation and subsequent NDMA production. Excellent correlations were observed between NDMA formation, UV absorbance at 254 nm, and total fluorescence reduction. These data provide evidence that UV and fluorescence surrogates could be used for monitoring and/or controlling NDMA formation during ozonation.