Fouling mechanisms of alginate solutions as model extracellular polymeric substances
Fouling mechanisms of alginate solutions as model extracellular polymeric substances
复制标题
DOI：
10.1016/j.desal.2004.09.019
复制
发表时间：
2005-05-10
期刊：
影响因子：
9.9
通讯作者：
Jefferson, B
中科院分区：
文献类型：
--
作者：
Ye, Y;Le Clech, P;Jefferson, B
胞外聚合物（EPS）是工业生物过滤过程中的主要污染物。然而，很少有研究调查的污染机制的多糖，一个主要群体的大分子在EPS。在这项工作中，死端无搅拌过滤海藻酸钠，一种模型多糖，进行了分析，使用经典的过滤定律和结合孔堵塞和饼形成模型。结果发现，滤饼模型似乎适合整个范围的超滤数据，而连续的标准孔阻塞模型和滤饼模型更适用于微滤膜（0.2 μ m的轨道蚀刻和0.22 μ m的PVDF膜）。比滤饼阻力（alpha（c））（约1 x 10（16）m/kg）与文献报道的牛血清白蛋白（BSA）的ac和MBR系统中的实际EPS相似，并且高于许多胶体颗粒的阻力。a.随着藻酸盐浓度的增加而增加，但随着料液中BSA的存在而略有降低。在过滤过程中获得的海藻酸盐饼具有低压缩性和低孔隙率，尽管不同膜之间存在一些差异。在过滤中断后缺乏完全通量恢复意味着在藻酸盐污染层内存在强的分子间吸引相互作用。
Extracellular polymeric substances (EPS) are viewed as major fouling components during filtration of biological feeds in industry. However, very few studies investigated the fouling mechanisms of polysaccharides, one major group of macromolecules in EPS. In this work, dead end unstirred filtration of sodium alginate, a model polysaccharide, was carried out and analysed using classic filtration laws and the combined pore blockage and cake formation model. It was found that the cake model appears to fit the entire range of the ultrafiltration data while the consecutive standard pore blocking model and cake model are more applicable to microfiltration membranes (0.2 mu m track-etched and 0.22 mu m PVDF membranes). The specific cake resistance (alpha(c)) (approximately 1 x 10(16) m/kg) is similar to ac of bovine serum albumin (BSA) and actual EPS in MBR systems reported in the literature, and higher than that of many colloidal particles. a. increases with the increase of alginate concentration but slightly decreases with the presence of BSA in the feed solution. The alginate cake obtained during filtration features both low compressibility and low porosity despite some differences between different membranes. The lack of a full flux recovery following filtration interruption implies the existence of strong intermolecular attractive interactions within the alginate fouling layer.