Contribution of Dimethylamine to N -Nitrosodimethylamine Formation at Reverse Osmosis Water Reclamation Facilities
Contribution of Dimethylamine to N -Nitrosodimethylamine Formation at Reverse Osmosis Water Reclamation Facilities
复制标题
二甲胺对反渗透水回收设施中 N-亚硝基二甲胺形成的贡献
DOI：
10.1021/acs.estlett.2c00852
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发表时间：
2022
影响因子：
10.9
通讯作者：
Hanigan, David
中科院分区：
文献类型：
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作者：
Song, Mingrui;Roback, Shannon L.;Ishida, Kenneth P.;Wang, Junli;Plumlee, Megan H.;Hanigan, David
N-亚硝基二甲胺(NDMA)是二氯胺与含氮前体反应生成的消毒副产物。在采用反渗透(RO)和紫外线高级氧化工艺(UV-AOP)的水回用设施中，NDMA通常被降低到低于2 ng/L。然而，在某些情况下，NDMA在输送过程中会“反弹”到低ng/L浓度。逃避RO和UV-AOP的前体目前尚不清楚。二甲胺(DMA)对经过处理的废水或地表水中的NDMA前驱物池没有实质性贡献，但尚未对再利用设施中是否存在DMA进行评估。我们利用反渗透技术和UV-AOP技术在四个中试规模的再生水设施和一个中试规模的再生水设施中测量了DMA及其氯化类似物(CDMA)。在6个采样事件中，UV-AOP产品和成品水中的二甲基亚胺和码分多址的中位数总和为0.4μg/L。在一年内三次抽样的一个再生设施中，成品水的DMA/CDMA值在0.4~1.4ngg/L之间。在一个设施中，DMA/CDMA值占UV-AOP产品水中NDMA前体总量的5%-43%，最高可达40μ/L。这些发现使处理策略成为可能，从而减少NDMA的形成，从而加强饮用水再利用的未来。
N-Nitrosodimethylamine (NDMA) is a disinfection byproduct formed from reactions between dichloramine and nitrogenous precursors. At water reuse facilities with reverse osmosis (RO) and ultraviolet-advanced oxidation processes (UV-AOP), NDMA is typically reduced to less than 2 ng/L. However, in some cases, NDMA “rebounds” to low ng/L concentrations during conveyance. The precursors evading RO and UV-AOP are currently unknown. Dimethylamine (DMA) does not substantially contribute to the NDMA precursor pool in treated wastewater or surface water, but DMA occurrence in reuse facilities has not been evaluated. We measured DMA and its chlorinated analogue (CDMA) in four full-scale water reclamation facilities utilizing RO and UV-AOP and one at pilot scale. The median sum of DMA and CDMA in the UV-AOP product and finished waters was 0.4 μg/L across six sampling events. At one reclamation facility sampled three times over one year, finished water DMA/CDMA ranged from 0.4 to 1.4 μg/L. DMA/CDMA accounted for 5%–43% of the total NDMA precursor pool of the UV-AOP product water at one facility and up to approximately 40 ng/L of NDMA formation. These findings enable treatment strategies which will result in reduced NDMA formation, thereby strengthening the future of potable reuse.