微滤与氮化硅microsieves backpulsing和高频率

由陈Ning Koh, Frans耐受,托马斯·梅林和托马斯Wintgens

海水淡化224 (2008)88 - 97

文摘

氮化硅microsieves是微滤膜制造技术常用的半导体晶圆生产行业。这些膜的特点是均匀的孔隙大小和高孔隙度。此外,由于其选择性极薄层和相对开放的支撑结构,干净的水通量通常是非常高(至少一个数量级的100倍)比传统的微孔。这非常高通量导致microsieves是极其容易受到污染,在过滤通量下降。因此,一个新的操作技术,即高频backpulsing介绍保持microsieve表面清洗和维护的高通量。本文讨论的机制用于创建backpulses在非常高的频率和如此高频率的影响backpulses微粒和nonparticulate污染研究microsieves不同模型的解决方案。

作者

Frans耐受(1),托马斯·梅林(10),陈Ning Koh(1),托马斯Wintgens(4)

标签

污染控制(4)
…至少100倍)比传统的微孔。这非常高通量导致microsieves是非常容易的污染在过滤和通量下降。因此,一个新的操作技术,即高频backpulsing介绍保持microsieve……从FluXXion帐面价值,创建backpulses在非常高的频率了。高频backpulsing所带来的影响污染控制生产用DCP技术研究了提要只包括微粒foulants(乳胶悬浮液),只有nonparticulat…

氮化硅microsieve(1)
…硅氮化microsieves是微滤膜制造技术常用的半导体晶圆生产行业。

高频backpulsing()
…技术常用于半导体晶圆生产行业。这些膜的特点是均匀的孔隙大小和高孔隙度。此外,由于其选择性极薄层和相对开放的支撑结构,干净的水通量通常很……使microsieves极其容易受到污染,在过滤通量下降。因此,一个新的操作技术,即。高频率backpulsing介绍了保持microsieve表面清洗和维护高通量。本文讨论了t使用的机制…

结论

使用一个旋转的切断阀的一个新概念,即动态交叉流脉冲技术FluXXion帐面价值,创建backpulses在非常高的频率了。污染控制的影响高频backpulsing用DCP技术研究了提要只包括微粒foulants(乳胶悬浮液),只有nonparticulate foulants (Ca (OH) 2)以及酵母悬架,这是一个混合的酵母细胞和其他胶体foulants。Backpulsing已经证明是非常有效的消除蛋糕层形成的口供foulants大于孔隙大小。然而,backpulsing有其限制在预防内部污垢,即孔隙堵塞毛孔收缩。对胶体foulants见实验与Ca (OH) 2,快速backpulsing浅振幅不能移除蛋糕层。也许在这种情况下,backpulses只是暂时把蛋糕层从膜表面,强backpulses必须保持表面的清洁。结果提供了一些见解microsieves的未来发展。重要的是要确保microsieves使用合适的孔隙大小以达到高通量,即大多数foulants应该大于毛孔,这样他们不能通过毛孔和犯规的microsieves backpulsing期间后侧。这也指出需要制造microsieves非常小的孔隙大小。然而,重要的是要注意,小孔隙大小将导致低通量。 Hence, there is an optimium between the pore size and flux which is dependent on the composition of the feed. The results have also shown the importance of the design of microsieve. Fouling at the rear side of the selective layer can be minimised if there is also a tangential flow in the support structure to carry out the foulants that are deposited, as in the case at the feed side. High frequency backpulsing has proven in this work to be an effective means to prevent external fouling of the microsieves. However, it is also important to highlight that the efficiency of backpulsing is also influenced by feed characteristics. Solute-solute interactions, as shown in the case of yeast filtration, can determine the stability of fluxes. However, membrane fouling is also known to be affected by factors such as operating parameters, membrane material properties as well as the feed characteristics. Stronger backpulsing may be more effective in reducing fouling, but this will result in an increased permeate loss which in turn affect fluxes, while weak backpulsing is insufficient to blow the fouling layer off the microsieve surfaces.