Desalination and concentration of liquid dyes by nanofiltration

Abstract

The process of desalination of aqueous dye-salt solutions by polymeric nanofiltration (NF) membranes using commercially available modules was studied. The experimental part is focused on determination of basic characteristics of tested membranes (Esna 1, Desal 5DK, NF 70, NF 90, NF 270, and TR 60), which above all means determination of the dependence of permeate flow intensity or rejection on pressure difference used. The demineralised water and water solution of NaCl are used to characterize all of the tested membranes. Great interest is also devoted to the mathematical modelling of NF and description of discontinuous diafiltration by periodically adding solvent at constant pressure difference.

Keywords:

• Nanofiltration
• Rejection
• Diafiltration
• Reactive dyes
• Dye desalination

Acknowledgements

This project was financially supported by Ministry of Education, Youth and Sports of the Czech Republic (Development of the research organization).

Notes

Presented at the Conference on Desalination for the Environment: Clean Water and Energy 11–15 May 2014, Limassol, Cyprus