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Polyelectrolyte-Based Sacrificial Protective Layer for Fouling Control in Reverse Osmosis Desalination
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2018-08-21 , DOI: 10.1021/acs.estlett.8b00400
Moon Son 1 , Wulin Yang 1 , Szilard S. Bucs 2 , Maria F. Nava-Ocampo 2 , Johannes S. Vrouwenvelder 2 , Bruce E. Logan 1
Affiliation  

Reverse osmosis (RO) membranes inevitably foul because of the accumulation of material on the membrane surface. Instead of trying to reduce membrane fouling by chemically modifying the membrane, we took a different approach based on adding a sacrificial coating of two polyelectrolytes to the membrane. After membrane fouling, this coating was removed by flushing with a highly saline brine solution, and a new coating was regenerated in situ to provide a fresh protective layer (PL) on the membrane surface. The utility of this approach was demonstrated by conducting four consecutive dead-end filtration experiments using a model foulant (alginate, 200 ppm) in a synthetic brackish water (2000 ppm of NaCl). Brine removal and regeneration of the PL coating restored the water flux to an average of 97 ± 3% of its initial flux, compared to only 83 ± 3% for the pristine membrane. The average water flux for the PL-coated membranes was 15.5 ± 0.6 L m–2 h–1 until the flux was decreased by 10% versus its initial flux, compared to 13.4 ± 0.5 L m–2 h–1 for the nontreated control. The use of a sacrificial PL coating could therefore provide a more sustainable approach for addressing RO membrane fouling.

中文翻译:

基于聚电解质的牺牲保护层,用于反渗透淡化中的结垢控制

由于材料在膜表面堆积,反渗透(RO)膜不可避免地会结垢。与其尝试通过化学修饰膜来减少膜结垢,我们采用了一种不同的方法,即在膜上添加两种聚电解质的牺牲涂层。膜结垢后,通过用高盐水溶液冲洗除去该涂层,并在原位再生新涂层在膜表面上提供新鲜的保护层(PL)。通过在合成咸水(2000 ppm NaCl)中使用模型污垢剂(藻酸盐,200 ppm)进行四个连续的死端过滤实验,证明了该方法的实用性。去除卤水和PL涂层的再生可使水通量恢复到其初始通量的平均97±3%,而原始膜仅为83±3%。涂有PL的膜的平均水通量为15.5±0.6 L m –2 h –1,直到通量相对于其初始通量减少了10%为止,而13.4±0.5 L m –2 h –1对于未经处理的对照。因此,牺牲性PL涂层的使用可以为解决反渗透膜结垢问题提供更可持续的方法。
更新日期:2018-08-21
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