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Panta Rei, Brine Recovery System, Ceramic UF Membranes, Spiral Polymeric NF Membranes, Up to 95% Salt Recovery

Description

  1. Overview
    1. Salt for the dyeing process is a major daily expense in the textile industry, especially for natural fabrics such as cotton.
    2. Besides economic savings, environmental issues linked to excessively salty water discharges make water and salt reuse a priority for dyeing companies with strong environmental and sustainability policies.
    3. This technology treats just the dye bath, which represents a small water amount compared to the whole amount of water generated by the textile process.
    4. The dye bath does not contain a significant concentration of hardness, so salt can be recovered without residual hardness.
  2. Process Description
    1. Water coming from the dye bath is screened and filtered before the UF stage.
    2. The system efficiency allows for the removal of suspended solids, as well as macromolecules and colloidal particles.
    3. The NF treatment line is able to recover up to 95% of the salt, while the remaining 5% of the water flow contains the rejected bivalent salts, colors and impurities, and is disposed of.
  3. Ultrafiltration Section
    1. Ceramic membranes are the choice for the UF section because of their robust structure, resistance to temperature values of up to 130°C, pH ranges between 0 and 14, and are almost impossible to foul thanks to wide passage channels and a high filtration velocity.
    2. UF membranes are designed according to clients' needs in order to guarantee maximum customization.
  4. Nanofiltration Section
    1. The NF section contains spiral polymeric membranes for textile industrial applications.
    2. These membranes show a high rejection of ions with +2 and -2 valence, such as Ca2+, Mg2+, and SO42-, while ions with +1 and -1 valence like Na+ and Cl- are able to pass with the permeate.
    3. Therefore, if in the dyeing process only NaCl is used, only this salt will be present in the permeate.