ELECTRODEIONIZATION PDF

Electrodeionization (EDI) is an electrically-driven water treatment technology that uses electricity, ion exchange and resin to remove ionized species from water. Create ultrapure water with continuous electrodeionization. IONPURE technologies, the first to commercialize continuous electrodeionization, offers modules. Remove residual salts and other aqueous species from your water with up to 18 MOhm-cm resistivity. SUEZ’s E-Cell* electrodeionization (EDI) technology.

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This technology can be used as an alternative to single-use purification cartridges. Some of the advantages of the EDI as opposed to the conventional systems of ionic interchange are:. There are also EDI units that are often referred to as continuous electrodeionization CEDI since the electric current regenerates the resin mass continuously. Electrodeionization EDI is an electrically-driven water treatment technology that uses electricity, ion exchange and resin to remove ionized species from water.

Steadily increasing research efforts have focused on the elucidation of detailed operational mechanisms, thereby enabling the extension of its applications to other fields. Remove residual salts and other aqueous species from your water with up to 18 MOhm-cm resistivity.

Water is fed through the wafer, while an electric current is applied to setup. Ions in the separate chamber are flushed to waste. Each cell consists of an electrode and an electrolyte with ions that undergo either oxidation or reduction. The water produced has met or exceeded customer high-purity water specifications.

Novel materials have been continuously developed toward the improvement and maturation of this technology, which may lead to enormous environmental and economic benefits on a global scale. An EDI stack has the basic structure of a deionization chamber. Electrochimica Acta Volume20 JunePages Since installation EDI units perform quite reliably, providing the customers with high purity production water for either power plant boiler feed or microchip rinse water.

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EDI plants (electrodeionization)

Ionization is followed by removal through the direct current and the ion exchange membranes. Abstract A robust ion-exchange resin wafer electrodeionization technology was used to demonstrate the energy efficiency of impaired water desalination.

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It differs from other water purification technologies in that it is done without the use of chemical treatments and is usually a polishing treatment to reverse osmosis RO. EDI is useful for any application that requires constant and economic removal of water impurities without using dangerous chemical. The ionization reactions occurring in the resin in hydrogen or hydroxide forms for the removal of weakly ionized compounds are listed below: In an early application, it was utilized to remove metallic species from radioactive wastewater; however, a poor understanding of its functional kinetics has slowed its development and applications.

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As the strong ions are removed from the process stream, the conductivity of the stream becomes quite low. We use cookies to help provide and enhance our service and tailor content and ads. EDI is a process which combines semi-impermeable membrane technology with ion-exchange media to provide a high efficiency demineralization process.

It suggests that resin wafer electrodeionization offers the potential for an abundant source of fresh water from impaired water desalination at a cost-effective manner, which should be viewed as a crucial component in the portfolio of water supply options.

Electrodeionization – Wikipedia

The deionized product water can then be used directly or undergo further treatment for enhanced water purity. Ion-selective membranes allow the positive ions to separate from the water toward the negative electrode and the negative ions toward the positive electrode. An anode is setup on the left side of the setup and a cathode is setup on the right side of the setup. Strong ions are scavenged out of the feed stream by the mixed bed resins. In this study, the energy efficiency of brackish water desalination using resin wafer electrodeionization was evaluated along with salt removal ratio, current efficiency and productivity.

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Fractional Electrodeionization for Highly Purified Process Water

When flow enters the resin filled diluiting compartment, several processes are set in motion. They are ideal for multiple applications including: Some of electrodeionizattion advantages of the EDI as opposed to the conventional systems of ionic interchange are: These ellectrodeionization resins allow ionization of neutral or weakly-ionized aqueous species such as carbon dioxide or silica.

By continuing you agree to the use of cookies. The energy consumption of resin wafer electrodeionization was found to be 0. An electrode in an electrochemical cell is referred to as either an anode or a cathodeterms that were coined by Michael Faraday.

Several key operating factors, including treatment time, applied electrical energy and feed flow rate were selected through experimental design. Water enters the EDI module, where an applied current forces ions to move through the resins and across the electrodeioniztaion. You may also be interested in Water is passed between an anode positive electrode and a cathode negative electrode. The combination of ion-exchange resins and ion-exchange membranes, which are used to move ionic impurities into a waste or concentrate water stream leaving purified product electrodeionozation.

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