Intra-layer flow in fouling layer on membranes
Intra-layer flow in fouling layer on membranes
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DOI：
10.1016/j.memsci.2006.10.051
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发表时间：
2007-01
影响因子：
9.5
通讯作者：
Zhen Yang;X. Peng;Ming-Yuan Chen;Duu-Jong Lee;J. Lai
中科院分区：
文献类型：
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作者：
Zhen Yang;X. Peng;Ming-Yuan Chen;Duu-Jong Lee;J. Lai
污垢层的结构决定了污垢层两端的压降。采用六重染色结合激光共聚焦显微镜（CLSM）技术，研究了混合纤维素酯膜生物污损层中核酸、蛋白质、α-d-吡喃葡萄糖多糖、β-d-吡喃葡萄糖多糖和脂类的三维分布。基于CLSM系列图像中观察到的污染层结构的三维体积网格模型，使用商业软件模拟过滤过程中的层内流场。污垢层的有效渗透率估计为2.65×10− 12 m2，这决定了污垢层渗透率的上限估计值。采用最大凸周长法对污垢层中的孔隙进行了分类，并研究了堵塞孔隙对污垢层渗透性能的影响。堵塞占孔隙度15%的大孔隙，平均渗透率降低了58%。
The structure of fouling layer determines the pressure drop across the fouling layer. Three-dimensional distributions of nucleic acids, proteins, α-d-glucopyranose polysaccharides, β-d-glucopyranose polysaccharides and lipids in the biofouling layer that is formed on a mixed cellulose ester membrane were determined using a six-fold staining protocol combined with confocal laser scanning microscopy (CLSM). Based on the three-dimensional volumetric grid model of the fouling layer structure observed from the series of CLSM images, the intra-layer flow field during filtration was simulated using commercial software. The effective permeability of the fouling layer was estimated to be 2.65×10−12m2, which determines the upper estimate on the permeability of the fouling layer. The pores were categorized according to their diameters, using the maximum convex perimeter approach, and then the effects of the blocking pores on the permeability of the fouling layer were investigated. Blocking the large pores that accounted for 15% of the porosity reduced the mean permeability by 58%.