Membrane fouling in ultrafiltration of latex paint

乳胶漆超滤中的膜污染

基本信息

批准号：
216939-2013
负责人：
Doan, Huu
金额：
$ 1.6万
依托单位：
Ryerson University
依托单位国家：
加拿大
项目类别：
Discovery Grants Program - Individual
财政年份：
2018
资助国家：
加拿大
起止时间：
2018-01-01 至 2019-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=649389
关键词：
Membrane fouling ultrafiltration latex paint

项目摘要

Ultrafiltration (UF) is a membrane separation process used in a wide range of applications, such as: water/wastewater treatment, water pre-treatment for reverse osmosis, separations in food, chemical and biochemical industries. With the developement of low-pressure membranes, membrane applications, including ultrafiltration, have been growing exponentially in recent years. However, a major challenge in the application of ultrafiltration is membrane fouling by the solutes in the feed solution. Membrane fouling causes a reduction of the filtrate flux with time, and hence, a low filtration efficiency.** In the manufacture of paint products, a large amount of wastewater is generated from cleaning of reactors and mixing basins. The wastewater contains a wide variety of substances, such as: organic and inorganic pigments, latex, solvents and emulsifying agents. The treatment of latex-paint wastewater by ultrafiltration can serve not only for pollution control but also for latex recovery. One of the benefits of treating water-based paint effluent by ultrafiltration over other processes such as electrochemical oxidation or Fenton oxidation is the potential to reclaim the solid in the effluent as well as to reuse the filtrate as process or cleaning water. However, membrane fouling causes a significant increase in the hydraulic resistance, manifested as a permeate flux decline or a transmembrane pressure increase. The energy consumption in the filtration process thus increases. Membrane fouling also increases the complexity of membrane filtration operation since the system has to be halted frequently to restore the filtrate flux by back-washing. Over a long period of operation, membrane fouling might not be totally reversible by back-washing. In order to regain the membrane efficiency, chemical cleaning is often used. This results in an increased operational cost. In addition, chemical cleaning reduces the membrane lifetime. These make UF less economically feasible for some applications. Therefore, a thorough understanding of this phenomenon and the development of novel techniques to reduce or eliminate membrane fouling are of important.************

超滤（UF）是一种在广泛应用中使用的膜分离过程，例如：水/废水处理，用于反渗透的水预处理，食物中的分离，化学和生化工业。随着低压膜的发展，近年来，包括超滤在内的膜应用已经成倍增长。然而，超滤应用的主要挑战是饲料溶液中溶质的膜污染。膜结垢会随着时间的流逝而导致滤液通量减少，因此，滤过效率低。废水包含多种物质，例如：有机和无机色素，乳胶，溶剂和乳化剂。超滤对乳胶粉的处理不仅可以用于污染控制，还可以用于乳胶恢复。与其他过程（例如电化学氧化或Fenton氧化）相比，通过超滤处理水性油漆废水的好处之一是在废水中收回固体以及将过滤作为过程或清洁水重复使用。然而，膜结垢会导致液压抗性显着增加，这表现为渗透通量下降或跨膜压力增加。因此，过滤过程中的能耗增加。膜结垢还增加了膜过滤操作的复杂性，因为必须经常停止系统以通过冲洗来恢复滤液通量。在长期操作中，膜结垢可能不会完全可逆。为了恢复膜效率，经常使用化学清洁。这导致运营成本增加。此外，化学清洁会降低膜寿命。这些使UF在某些应用中经济上的可行性降低。因此，对这种现象的透彻理解以及减少或消除膜结垢的新技术的发展非常重要。************