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Assessing the potential of integrally skinned asymmetric hollow fiber membranes for addressing membrane fouling in pressure retarded osmosis process
Desalination ( IF 9.9 ) Pub Date : 2021-09-20 , DOI: 10.1016/j.desal.2021.115347
Nguyen Anh Pham 1, 2, 3 , Daniel Yee Fan Ng 1 , Kunli Goh 1 , Zhili Dong 4 , Rong Wang 1, 2
Affiliation  

Thin-film composite (TFC) membranes are generally preferred over integrally skinned asymmetric (ISA) membranes in pressure retarded osmosis (PRO) process due to their much higher water permeability, but they cannot operate in the active layer facing feed solution (AL-FS) orientation because of potential delamination of the rejection layer under the high applied pressure. However, operating under AL-FS orientation is preferred as a strategy for better fouling control. Hence, in this study, three ISA hollow fiber membranes were fabricated using a dry-jet wet-spinning method, followed by chemical cross-linking to obtain membranes for PRO application. The best-performing membrane was subjected to fouling test in two orientations. Our results demonstrate that the AL-FS orientation is better for a sustainable long-term PRO operation, given the stable performance throughout the two-day testing. Also, the current use of power density per membrane area as a performance benchmark may not be practical for large-scale PRO operation, and the volumetric power density per module is more relevant. In terms of volumetric power density for a hypothetical 5-in. module, our best-performing membrane is predicted to generate a 3.6 to 10 times better power density than commercial modules, rendering our ISA hollow fiber membranes promising for scaling-up to bigger modules.



中文翻译:

评估整体蒙皮非对称中空纤维膜解决压力延迟渗透过程中膜污染的潜力

在压力延迟渗透 (PRO) 过程中,薄膜复合 (TFC) 膜通常优于整体蒙皮非对称 (ISA) 膜,因为它们具有更高的透水性,但它们不能在面向进料溶液 (AL-FS) 的活性层中运行) 取向,因为在高施加压力下排斥层可能分层。然而,在 AL-FS 方向下操作是更好的结垢控制策略。因此,在本研究中,使用干喷湿纺方法制造了三种 ISA 中空纤维膜,然后进行化学交联以获得用于 PRO 应用的膜。对性能最好的膜进行了两个方向的污染测试。我们的结果表明 AL-FS 方向更适合可持续的长期 PRO 操作,鉴于整个两天的测试性能稳定。此外,当前使用每膜面积的功率密度作为性能基准对于大规模 PRO 操作可能不切实际,每个模块的体积功率密度更相关。就假设 5 英寸的体积功率密度而言。模块,预计我们性能最好的膜产生的功率密度是商业模块的 3.6 到 10 倍,使我们的 ISA 中空纤维膜有望扩大到更大的模块。

更新日期:2021-09-20
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