Abstract

The methods of atomic-force- and scanning-electron microscopy are used to study the surface morphology of polymeric microfiltration membranes. Commercial membranes of the MFFK (on the basis of a hydrophobic fluoroplastic composite membrane, pore size of 0.45 μm) and MPS (polyethersulfone membrane, pore size of 0.45 μm) brands produced by OOO NPP Tekhnofil’tr (Vladimir, Russia) are used as the objects of study. A mature molasses brew produced by OAO Biokhim (Rasskazovo, Tambov Oblast) is used as the technological fluid for the working samples of MFFK and MPS membranes in the microfiltration process. An analysis of the surface morphology of the microfiltration membranes makes it possible to determine the regions of the location of pores, yeast, and polysaccharides, and the interpore connecting regions. By analyzing microscopic images, the flow lines of the solution to be separated are revealed in the profile hollows on the surface of the working microfiltration membranes. The initial MFFK and MPS membranes are found to have slit pores (0.4–0.6 μm in length and width), and the working membranes are contaminated (clogged) by yeast, polysaccharides, and their fragments, which is associated with residual dynamic membrane formation. The surface-roughness parameters of the working MFFK and MPS membranes are shown to be different: the R_a and R_z values differ by factors of 1.69 and 1.87, respectively; and the R_max values in the case of oblique and frontal sections differ by factors of 1.67 and 1.05, respectively. This is explained by the specific features accompanying the process of the microfiltration separation of solutions containing yeast, polysaccharides, and their fragments (the presence of an adsorption layer on the membrane surface and cracks in the residual layer of the dynamic membrane, i.e., the clogged layer).

中文翻译：

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MFFK和MPS品牌微滤膜的表面形态的原子力和扫描电子显微镜研究

摘要

原子力和扫描电子显微镜的方法被用来研究聚合物微滤膜的表面形态。使用由OOO NPP Tekhnofil'tr（俄罗斯弗拉基米尔，俄罗斯）生产的MFFK（基于疏水性氟塑料复合膜，孔径为0.45μm）和MPS（聚醚砜膜，孔径为0.45μm）的商业膜。研究的对象。由OAO Biokhim（拉斯卡佐沃，坦波夫州）生产的成熟糖蜜啤酒用作微滤过程中MFFK和MPS膜的工作样品的工艺液。对微滤膜的表面形态的分析使得确定孔，酵母和多糖的位置区域以及孔间连接区域成为可能。通过分析显微图像，待分离溶液的流线显示在工作微滤膜表面的型腔中。最初的MFFK和MPS膜被发现具有狭缝孔（长度和宽度为0.4–0.6μm），工作膜被酵母，多糖及其片段污染（阻塞），这与动态膜的残留形成有关。工作的MFFK和MPS膜的表面粗糙度参数显示为不同：这与残留的动态膜形成有关。工作的MFFK和MPS膜的表面粗糙度参数显示为不同：这与残留的动态膜形成有关。工作的MFFK和MPS膜的表面粗糙度参数显示为不同：R _a和R _z值分别相差1.69和1.87。斜部和额部的R _max值分别相差1.67和1.05倍。这是由含酵母，多糖及其片段的溶液的微滤分离过程伴随的特定特征来解释的（膜表面上存在吸附层，动态膜的残留层出现裂缝，即被堵塞）层）。