PDF(Pubmed)
Abstract：
The wine industry is a sector of great importance in the Spanish economy, contributing substantial annual revenues. However, one challenge facing the industry is the amount of waste generated, reaching millions of tons annually. These residues consist of organic matter of industrial interest, such as polyphenols. These substances are characterised by their excellent antioxidant properties, making them ideal for use in the food, cosmetic, and pharmaceutical industries. Modern techniques, such as membrane technology, are explored for their extraction based on separating compounds according to size. This work studies a sequential filtration process using ultrafiltration (UF) and nanofiltration (NF) membranes at different operating conditions (2 bar and 9.5 bar for UF and NF, respectively, at 20 °C) to extract polyphenols from wine lees. The results show a total polyphenols rejection rate for each process of 54% for UF and 90% for NF. Pore blocking models have been studied for the UF process and an intermediate pore blocking of the membrane upon wine lees filtration has been identified. A mathematical model that justifies the behavior of a polymeric NF membrane with the filtration of pre-treated vinasse residues has been validated. This study shows a viable process for extracting polyphenols from wine lees with sequential membrane technology.
摘要：
葡萄酒行业是西班牙经济中非常重要的部门，贡献可观的年收入。然而,该行业面临的一个挑战是产生的废物量，每年达到数百万吨。这些残留物由具有工业价值的有机物质组成，如多酚。这些物质的特点是其优异的抗氧化性能，使它们非常适合在食品中使用，化妆品,和制药行业。现代技术,如膜技术，在根据大小分离化合物的基础上，探索了它们的提取方法。这项工作研究了在不同操作条件下使用超滤（UF）和纳滤（NF）膜的顺序过滤过程（UF和NF为2bar和9.5bar，分别,在20°C）从酒糟中提取多酚。结果表明，每个过程的总多酚截留率为UF为54％，NF为90％。已经研究了UF工艺的孔阻塞模型，并且已经确定了酒糟过滤时膜的中间孔阻塞。已经验证了通过过滤预处理的酒糟残留物来证明聚合物NF膜行为的数学模型。本研究显示了用顺序膜技术从酒糟中提取多酚的可行工艺。
