Effects of peracetic acid on aromatic polyamide nanofiltration membranes: a comparative study with chlorine
Effects of peracetic acid on aromatic polyamide nanofiltration membranes: a comparative study with chlorine
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DOI：
10.1039/d0ew01007c
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发表时间：
2021-02-01
影响因子：
5
通讯作者：
Dai, Ning
中科院分区：
文献类型：
--
作者：
Ghafari, Mohsen;Mohona, Tashfia M.;Dai, Ning
过氧乙酸（PAA）被认为是膜基废水回用系统中的消毒剂，但其与聚酰胺膜的相容性尚未得到彻底研究。在这项工作中，我们表明，PAA引起的NF 90膜的性能和材料特性的变化比传统的无氯消毒剂（NaOCl）少得多。PAA暴露（1-180 g h L-1）后，膜水通量和盐和中性有机化合物的截留率的变化显着小于在低至1 g h L-1的水平下NaOCl暴露所产生的变化。两种废水成分，氯化物或Fe（II）的存在下，没有显着影响膜性能后，暴露于PAA。表面表征表明，氧被PAA引入聚酰胺，其中一些归因于羧酸基团的形成。使用模型芳族酰胺，苯甲酰苯胺的实验表明PAA在保护膜免受由Fe（II）和存在于商业PAA制剂中的H2 O2形成的自由基的影响中的意想不到的作用。此外，产物鉴定表明，酰胺键断裂和环氧化是PAA的可能反应机制。我们的研究结果支持PAA是一个可行的消毒剂候选人的废水回用，值得进一步评估。
Peracetic acid (PAA) is being considered as a disinfectant in membrane-based wastewater reuse systems, but its compatibility with polyamide membranes has not been thoroughly investigated. In this work, we showed that PAA induced much less change in the performance and material characteristics of NF90 membranes than the traditional disinfectant free chlorine (NaOCl). The change in membrane water flux and the rejection of salt and neutral organic compounds after PAA exposure (1-180 g h L-1) is significantly less than that resulting from NaOCl exposure at levels as low as 1 g h L-1. The presence of two wastewater constituents, chloride or Fe(ii), did not significantly impact membrane performance upon exposure to PAA. Surface characterization showed that oxygen was incorporated into polyamide by PAA, some of which was attributed to the formation of carboxylic acid groups. Experiments using a model aromatic amide, benzanilide, indicated an unexpected role of PAA in protecting the membrane from radicals formed by Fe(ii) and the H2O2 present in commercial PAA formulations. Furthermore, product identification suggests that both amide bond breakage and ring oxidation are possible reaction mechanisms for PAA. Our findings support that PAA is a viable disinfectant candidate for wastewater reuse and warrants further evaluation.