Ferrate Preoxidation Alleviating Membrane Fouling through the Formation of a Hydrophilic Prefiltration Layer,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.)

Ferrate Preoxidation Alleviating Membrane Fouling through the Formation of a Hydrophilic Prefiltration Layer
ACS ES&T Engineering ( IF 7.4 ) Pub Date : 2021-09-08 , DOI: 10.1021/acsestengg.1c00239
Hai-Yang He ₁ , Wei Qiu ₁ , Yu-Lei Liu ₁ , Shu-Yue Xu ₁ , Jun Ma ₁ , Lu Wang ₁

Affiliation

Membrane fouling is one of the main obstacles impacting ultrafiltration (UF) membranes for water purification. Herein, it was found that a hydrophilic layer that is composed of a ferric floc formed in the reduction of ferrate coated on the membrane during the ultrafiltration of river water, and this layer is effective for attenuating membrane fouling. The newly formed ferric (hydro)oxide particles aggregated with natural organic matter (NOM) of the source water and then deposited on the membrane surface forming a negatively charged, porous, and hydrophilic prefiltration layer. This layer was beneficial for rejecting transphilic dissolved organic carbon (DOC), resulted in the accumulation of external membrane foulants, and alleviated internal membrane fouling. The membrane flux improved by 2.8 times, and the membrane fouling resistance decreased by 0.36 times after preoxidation with 1.5 mg/L of ferrate. Meanwhile, the performance of the membrane rejection was enhanced by this layer as well. DOC and UV₂₅₄ were eliminated by 41% and 67% at the condition of 2.0 mg/L ferrate preoxidation coupled with UF. A model analysis suggested that intermediate and standard pore blocking were enhanced after ferrate preoxidation, while cake layer fouling was substantially attenuated. The ferric prefiltration layer can be back-washed for the recovery of membrane flux and be repeatedly generated through ferrate preoxidation. The combination of ferrate preoxidation with UF takes full advantage of the oxidizability of ferrate and the aggregation/adsorption potential of ferric (hydro)oxides by the reduction of ferrate.

中文翻译：

高铁酸盐预氧化通过形成亲水预过滤层减轻膜污染

膜污染是影响用于水净化的超滤 (UF) 膜的主要障碍之一。在此发现，在河水超滤过程中，由高铁酸盐还原形成的铁絮体组成的亲水层涂覆在膜上，该层对减弱膜污染是有效的。新形成的三氧化二铁颗粒与源水中的天然有机物 (NOM) 聚集，然后沉积在膜表面，形成带负电荷的多孔亲水预过滤层。该层有利于排斥跨亲溶解有机碳（DOC），导致外部膜污染物的积累，并减轻内部膜污染。膜通量提高2.8倍，1.5mg/L高铁酸盐预氧化后膜抗污染性降低0.36倍。同时，该层也提高了膜截留性能。DOC 和紫外线在2.0 mg/L高铁酸盐预氧化结合超滤条件下，_254个被消除了41%和67%。模型分析表明，高铁酸盐预氧化后，中间孔和标准孔的阻塞得到增强，而滤饼层结垢显着减弱。铁质预滤层可反洗回收膜通量，并通过高铁酸盐预氧化反复生成。高铁酸盐预氧化与超滤的结合充分利用了高铁酸盐的氧化性和高铁酸盐还原引起的三价铁（氢）氧化物的聚集/吸附潜力。

更新日期：2021-11-12

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