Removal of disinfection byproducts in forward osmosis for wastewater recycling
Removal of disinfection byproducts in forward osmosis for wastewater recycling
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DOI：
10.1016/j.memsci.2018.07.041
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发表时间：
2018-10
影响因子：
9.5
通讯作者：
Jiale Xu;Thien N. Tran;Haiqing Lin;Ning Dai
中科院分区：
文献类型：
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作者：
Jiale Xu;Thien N. Tran;Haiqing Lin;Ning Dai
正向渗透（FO）是一种新兴的废水回收膜技术。然而，其去除消毒副产物（DBP）（废水回收的一个关键方面）的性能尚未得到研究。本研究系统地研究了两种商用 FO 膜（水通道蛋白和 CTA）中与废水回收相关的 16 种中性 DBP 的截留率。与干净的 CTA 膜相比，干净的 Aquaporin 膜对所有 DBP 表现出更高的截留率。对于 N-亚硝基二甲胺 (NDMA) 和卤代乙腈 (HAN)（废水回收中最常见且毒性最大的 DBP），水通道蛋白的截留率分别为 31% 和 48-76%。 FO 中 DBP 的排斥与其不同 DBP 组的大小呈正相关，但与其疏水性无关。海藻酸盐和牛血清白蛋白 (BSA) 造成的有机污染降低了大多数 DBP 的排斥和跨膜通量。使用溶液扩散模型讨论了 DBP 传输和结垢的影响，该模型结合了尺寸排除、膜与 DBP 之间的表面相互作用以及膜内 DBP 扩散。最后，将本研究测定的 FO 膜中 NDMA 和 HAN 的截留率与文献报道的反渗透 (RO) 膜中的截留率进行了比较。
Forward osmosis (FO) is an emerging membrane technology for wastewater recycling. However, its performance in removing disinfection byproducts (DBPs), a critical aspect of wastewater recycling, has not been investigated. This study systematically investigated the rejection of sixteen neutral DBP that are relevant to wastewater recycling in two commercial FO membranes (Aquaporin and CTA). Clean Aquaporin membrane displayed higher rejection for all DBPs than clean CTA membrane. ForN-nitrosodimethylamine (NDMA) and haloacetonitriles (HANs), the most prevalent and toxic DBPs in wastewater recycling, the rejection by Aquaporin was 31% and 48–76%, respectively. The rejection of DBPs in FO positively correlated with their size across different DBP groups but did not correlate with their hydrophobicity. Organic fouling by alginate and bovine serum albumin (BSA) decreased the rejection and transmembrane fluxes of most DBPs. The DBP transport and the influence of fouling were discussed using a solution-diffusion model incorporating size exclusion, the surface interaction between the membrane and DBPs, and DBP diffusion within the membrane. Lastly, the rejection of NDMA and HANs in FO membranes determined in this study was compared with that in reverse osmosis (RO) membranes reported in the literature.