Electrodeionization EDI systems have become the solution to many applications, with lower operating expenses and fewer maintenance requirements making. Remove residual salts and other aqueous species from your water with up to 18 MOhm-cm resistivity. SUEZ’s E-Cell* electrodeionization (EDI) technology. Electrodeionization (EDI) is a water purification system that relies on electricity to remove ionic impurities from water into a concentrate water stream.
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When fed with low TDS feed e. This technology can be used as an alternative to single-use purification cartridges.
Aqueous two-phase system Azeotrope Eutectic. An anode is setup on the left side of the setup and a cathode is setup on the right side of the setup. Duplexing of large EDI systems is not required, because a single EDI module may be taken off line wystem maintenance or repair while the remaining modules operate at a slight increase in flow rate to maintain the required flow through the system. Articles lacking reliable references from December All articles lacking reliable references.
In this way these charged strong-ion species are continuously removed and transferred in to the adiacent concentrating compartments.
This section is broken down into the following topics: Views Read Edit View history. How does it work? The electric current supplied from various energy sources charges the ions that make up the contaminants.
Each cell consists of electroxeionization electrode and an electrolyte with ions that undergo either oxidation or reduction.
Regenerations of ion exchangers typically takes several hours, require bulk storage and pumping facilities for regenerant chemicals, and usually require a waste neutralization tank. Regenerable Mixed Bed Deionization No acid or caustic bulk storage, pumping, waste neutralization or disposal issues.
Electrodeionization | Water Solutions
Water is fed through the wafer, while an electric current is applied to setup. The chamber contains a ion exchange resin, packed between a cationic exchange membrane and a anionic exchange membrane.
Sensitivity to chlorine EDI is just as sensitive to the chlorine as thin-film reverse osmosis RO processes. Ion-selective membranes allow the positive ions to separate from the water toward the negative electrode and the negative ions toward the positive electrode. Located in a severely water scarce area in Tarragona, our customer, Gas Natural, needed to convert seawater into ultrapure water for power production.
By eliminating the periodic regeneration requirement of ion exchange resin, environmental benefits are also realized electrodeionixation avoiding the handling and processing of acid and caustic chemicals brought to the site.
High purity deionized water results.
Conventional water treatment systems rely on chemically-regenerated ion exchange resins to remove dissolved solids. RO systems do not require chemical regeneration and also remove many types of total organic carbon TOC which will pass through ion exchange resins. There are several effective and relatively inexpensive ways to remove CO 2 in the pretreatment system.
No acid or caustic bulk storage, electrodeioniaztion, waste neutralization or disposal issues. When flow enters the resin filled diluiting compartment, several processes are set in motion. Some of the advantages of the EDI as opposed to the conventional systems of ionic interchange are:.
A bipolar syatem is an electrode that functions as the anode of one cell and the cathode of another cell.
Electrodeionization – Wikipedia
These regenerated resins allow ionization of neutral or weakly-ionized aqueous species such as carbon dioxide or silica. In some cases, the flectrodeionization exchange resins actually contribute to the TOC content in the water. Eliminates the need for a second bank of RO membranes and associated plumbing, pumping and control equipment.
This section is dedicated to those who are just learning about Continuous Electrodeionization also known in generic terms as Electrodeionization EDI.
The positively charged ions flow toward the cathode and are rinsed out in the concentrate stream, and the negatively charged ions flow toward the anode and are rinsed out in another concentrate stream.
December Learn how and when to remove this template message. 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 water.
Retrieved from ” https: May be registered in one or more countries. Only the ions can pass through the membrane, the water is blocked. The water produced has met or exceeded customer high-purity water specifications. Argonne National Laboratory estimates that The anode is defined as the electrode at which electrons leave the cell and oxidation occurs, and the cathode as the electrode at which electrons enter the cell and reduction occurs.