Electrodeionization

Electrodeionization technology (EDT) is an alternative to mixed bed filters (MBF). This technology allows you to remove dissolved salts without regeneration chemicals and with low energy consumption.

Water quality is achieved - 16-18 megohms.

Electrodeionization combines two methods - electrodialysis and ion exchange by using ion-exchange resins.

Process description

The permeate, which is obtained in the reverse osmosis system, before being separated into streams EDI module. EDI feed water passes through the desalination chambers are filled with an ion exchange resin. The electric field moves through the anion resin bed in the direction of the anode.

As a result, they pass through the anion permeable membrane and fall into the adjacent concentrate stream. Cations pass through the resin bed in the direction of the cathode, pass through the cation permeable membrane and fall into similar adjacent concentrate stream.

With the flow of concentrate. electrolyte flow removes gases which are generated at the electrodes, as well as ions and removes them from the module.

As a result of the decomposition voltage of water in the desalination chamber of the ion exchanger bed. The formed ions OH- and H + ion exchange resin regeneration is performed.

Thus there is a constant work without the need to shut down the system for regeneration.

Benefits

Advantages compared with the ion-exchange filters, which need regeneration:

• No need for chemicals.

• No waste water containing toxic chemicals.

• Continuous operation.

• Consistent quality ultrapure water.

• No pathogens.

• Reduced capital costs and maintenance costs.

• Electricity costs - up to 0.5 kW per 1 m3.