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Nanofiltration

Nanofiltration is a pressure-operated membrane process in which the smallest molecules and multivalent ions are separated from a solution. Monovalent ions like Na+ or Cl- pass the membrane almost completely.

Nanofiltration works like reverse osmosis using a dense membrane via transport by diffusion. Nanofiltration is characterised by a membrane structure that allows monovalent ions to pass through more easily than for bivalent ions. In addition, the separation limit of certain nanofiltration membranes on the market varies significantly. It is possible to selectively separate undesirable compounds by using the right membranes. We will help you select the best option for your process needs based on our process experience and skills. Typical applications for nanofiltration are:

• Cleaning of caustic solutions in the pulp, paper, and food industry

• Purification of acids by selective separation of metals

• Desalination of solutions

• Separation of multivalent ions (e.g., phosphate, sulphate, calcium, magnesium)

• Concentration of process solutions

• Separation from COD

• Decolourization of solutions

Nanofiltration is a versatile technique that allows for the selective separation of ingredients. This concentrate can be concentrated further downstream, for example using high-pressure reverse osmosis, and reused as a valuable raw material. The filtrate can then be refined further such as by reverse osmosis, to produce deionized water, which can then be returned to the process. Through an intelligent process management plan (Minimum Liquid Discharge (MLD) and Zero Liquid Discharge (ZLD)), we will help you get the most out of the process while avoiding wastewater.

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