Whey electrodialysis using organic-inorganic membranes

Abstract

Organic-inorganic membranes based on heterogeneous ion exchange polymer supports, which were modified with hydrated zirconium dioxide (anion exchange membrane) and zirconium hydrophosphate (cation exchange separator), were used for whey desalination as well as for concentrate and permeate of whey nanofiltration. Comparing with pristine polymer membranes, the composite materials are characterized by stability against fouling inside pores. The membranes were applied to desalination of whey and products of its baromembrane treatment. Exponential decay of electrical conductivity over time has been found for the solutions being purified. The membrane resistance grew simultaneously.