Performance of a Hybrid ED–NF Membrane System for Water Recovery Improvement via NOM Fouling Control,ACS ES&T Engineering

当前位置： X-MOL 学术 › ACS ES&T Eng. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Performance of a Hybrid ED–NF Membrane System for Water Recovery Improvement via NOM Fouling Control
ACS ES&T Engineering ( IF 7.4 ) Pub Date : 2021-08-10 , DOI: 10.1021/acsestengg.1c00153
Soyoon Kum ₁ , Matthew R. Landsman ₁ , Gregory M. Su _{2,

3} , Guillaume Freychet ₄ , Desmond F. Lawler ₁ , Lynn E. Katz ₁

Affiliation

Natural organic matter (NOM) complicates water treatment and causes formation of disinfection byproducts (DBPs). NOM is removed well by nanofiltration (NF) but causes extensive membrane fouling, especially in the presence of divalent cations. This research investigated a hybrid electrodialysis-nanofiltration (ED–NF) system to treat freshwaters containing hardness and NOM. ED removes most ions but little to no NOM, and the ED diluate is, then, treated with NF to remove NOM with reduced fouling. Subsequently, some or all of the ED concentrate can be mixed with the NF permeate to increase water recovery, limit NOM concentration (and thereby reduce DBPs), and control the ion content. Compared to NF alone, ED–NF increases product water yield. NF fouling was reduced by the removal of divalent cations in ED. Spectroscopic and resonant scattering measurements of fouled membranes near the calcium K-edge reveal a significant contribution to NF fouling by calcium bridging between carboxyl groups in NOM and on the membrane surface. This novel ED–NF system allows several control “knobs” to increase water recovery and reduce DBP formation potential by adjusting ED water recovery, ED diluate (and concentrate) ionic composition, and the fraction of concentrate remixed with NF permeate to form the product water.

中文翻译：

通过 NOM 污垢控制改善水回收率的混合 ED-NF 膜系统的性能

天然有机物 (NOM) 使水处理复杂化并导致消毒副产物 (DBP) 的形成。NOM 可以通过纳滤 (NF) 很好地去除，但会导致大量的膜污染，尤其是在存在二价阳离子的情况下。本研究调查了混合电渗析-纳滤 (ED-NF) 系统来处理含有硬度和 NOM 的淡水。ED 去除大部分离子但很少或没有 NOM，然后用 NF 处理 ED 稀释液以去除 NOM 并减少结垢。随后，可以将部分或全部 ED 浓缩液与 NF 渗透液混合，以提高水回收率、限制 NOM 浓度（从而降低 DBP）并控制离子含量。与单独使用 NF 相比，ED-NF 增加了产水量。通过去除 ED 中的二价阳离子减少了 NF 污染。钙 K 边缘附近污染膜的光谱和共振散射测量揭示了 NOM 中羧基之间和膜表面上的钙桥接对 NF 污染的显着贡献。这种新型 ED-NF 系统允许多个控制“旋钮”通过调节 ED 水回收率、ED 稀释（和浓缩）离子组成以及与 NF 渗透物重新混合形成产品水的浓缩物部分来增加水回收率并降低 DBP 形成的可能性.

更新日期：2021-10-08

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文