Technological Offer

Treatment of water for agricultural applications by adjusting the ionic composition with capacitive deionization ECPU-02


IMDEA Energy has developed a methodology based on Capacitive Deionization which allows the adjustment of monovalent and divalent ions ratio (SAR) for low salinity solutions on demand.

Capacitive deionization, CDI, is an electrochemical water treatment technology characterized by achieving reduction of the salt content in the water with a low energy cost. Conventional CDI does not show ion selectivity since it is based on the electrosorption of any charged species dissolved in the feed solution. However, the advanced CDI concepts developed by IMDEA Energy allow a practical modification of monovalent and divalent ion concentrations in water solutions. Those can be modulated by changing the operating conditions or the characteristics of the electrode materials.

Advantages and innovation

The versatility of the technology and the ease in controlling the process allow to produce water of different qualities tailored to the final application demand.

CDI is an energy-efficient technology because it does not use high pressure systems, nor membranes and its regeneration cycle is designed to recover part of the energy supplied during the deionization cycle.

Market applications

Agriculture. This technology has great potential in agricultural applications as it enables the adjustment of critical parameters for irrigation water such as Sodium Adsorption Ratio (SAR) and conductivity.

Wastewater treatment. The technology can be applied in wastewater treatment plants to adjust the outlet according to environmental requirements, particularly if additional uses of the wastewater outlet are planned, e.g. process water and irrigation.


Félix Marín,