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Nanofiltration application in food technology and environmental protection

  • Gyula Vatai

Abstract

Nanofiltration (NF) is a pressure driven membrane process applied in the area between the separation capabilities of reverse osmosis (RO) membranes and ultrafiltration (UF) membranes, that is, in the separation of ions from solutes such as small molecules of sugars. Nanofiltration is often used where the divalent ions (Ca, Mg and ions of plating industry) have to be removed. The molecular weight cut off of nanofiltration membranes is between 200-1000 Daltons, which means pore size ranges between 1-10 nm. Typical rejections of NF membranes are 60% for NaCl, 98% for magnesium sulphate, glucose and sucrose. Generally, this opens up the possibilities for process efficiency improvements and the production of new products, particularly in the food industry and biotechnology1. Some other specific applications are removal of colour, removal of TOC and trihalomethane precursors from surface water, removal of low molecular weight species such as organics in pharmaceutical production, surfactants from waste waters. The potential applications of nanofiltration in food industry and environmental protection are listed in Tab. 1.

Keywords

Reverse Osmosis Transmembrane Pressure Spiral Wound Process Efficiency Improvement Retentate Concentration 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 2000

Authors and Affiliations

  • Gyula Vatai
    • 1
  1. 1.Department of Food EngineeringUniversity of Horticulture and FoodBudapestHungary

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