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Termokimik avails itself of Electro deionisation (EDI), a highly efficient water treatment technology that meets the most stringent environmental standards and produces ultrapure water without chemicals, starting from feedwater with a conductivity of up to 25 30 µS/cm.
The individual EDI cell consists of a membrane permeable to cations, of a membrane permeable to anions and of a mixture of cation and anion resins placed between the two membranes. Several cells are assembled to form a stack with two electrodes fitted at its ends. Voltage applied across the electrodes causes the cations to migrate towards the negative electrode (cathode) and the anions towards the positive electrode (anode), thus enabling to purify water to high specific resistivity values (16 Mohm.cm.). The system power consumption is approx. 0.3 Kw/h for each m3 of water produced. This process maintains the resins in a purified state without need for hazardous caustic and acid regeneration chemicals, unlike conventional mixed-beds.
If compared with standard demineralization systems, EDI features lower operating costs and provides environmental benefits at a similar capital cost. The EDI systems yield quality pure water at high recovery rates (90 to 95%), without costly and hazardous regeneration chemicals, thus replacing the conventional  demineralisation systems in applications with volumes from 12.5 gpm (2.8 m3/h) to 2,000 gpm (455 m3/h).
The system is based on a modular building block concept, where the elementary unit consists of cell pairs assembled into cell stacks.
Each cell stack is capable of delivering 12.5 gpm (2.8 m3/h) nominal of treated water. Stacks are mounted into standard horizontal or vertical racks and systems (24 stacks), providing an output of up to 300 gpm (68 m3/h) max.
Standard systems can be combined with any configuration of stacks to meet the required flow rate.
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