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.
||15 March 2005
|PDF File Size:
|ePub File Size:
||Free* [*Free Regsitration Required]
Electrodeionization | Water Solutions
An anode is setup on the left side of the setup and a cathode is setup on the right side of the setup. In between resin wafer compartments, there are concentrate compartments, where brine flows out of the system. Regenerable Mixed Bed Deionization No acid or caustic electrodrionization storage, pumping, waste neutralization or disposal issues. Only the ions can pass through the membrane, the water is blocked. Please improve this electrodeionizatino adding secondary or tertiary sources. EDI is a continuous process.
Most EDI devices have a 1 ppm hardness limit which is easily addressed with proper pretreatment system design. The ionization reactions occurring in the resin in hydrogen or hydroxide forms for the removal of weakly ionized compounds are listed below:. EDI provides a high quality water, low in particles, partiall due to the fact that there is no resin attrition from sgstem or osmotic shock, as would be the case with conventional ion exchange processes.
Introduction to Electrodeionization
Through electro dialysis an electrical potential transports and segregates charged aqueous species. This technology can be used as an alternative to single-use purification cartridges.
Eliminates expensive and hazardous chemicals used in ion-exchange resin regeneration Reduces energy and operating expenses Reduces the facility size requirement Helps plants meet ISO requirements.
Articles lacking reliable references from December All articles lacking reliable references. EDI is just as sensitive to the chlorine as thin-film reverse osmosis RO processes. High purity water production has traditionally used a combination of membrane separation and ion exchange sysem. They are sometimes referred to in abbreviated jargon as lytes.
The water produced has met or exceeded customer high-purity water specifications. When flow enters the resin filled diluiting compartment, several processes are set in motion. This page was last edited on 10 Octoberat Conventional water treatment systems rely on chemically-regenerated ion exchange resins elechrodeionization remove dissolved solids.
Sensitivity to hardness Most EDI devices have a 1 ppm hardness limit which is easily addressed with proper pretreatment system design. The ionization reactions occurring in the resin in hydrogen or hydroxide forms for the removal of weakly ionized compounds are listed below: This section is broken down into the following topics: The chamber contains a ion exchange resin, packed between a cationic exchange membrane and a anionic exchange membrane.
The electrical current is used to continuously regenerate the resin, eliminating the need for periodical regeneration.
Introduction to EDI gives you the basics.
This article relies too much on references to primary sources. Converting seawater to high purity water at Spain power plant Located in a severely water scarce area in Tarragona, our customer, Gas Natural, needed to convert seawater into ultrapure water for power production. Ion-selective membranes allow the positive ions to separate from the water toward the negative electrode and the negative ions toward the positive electrode.
Eliminates the need for a second bank of RO membranes and associated plumbing, pumping and control equipment. How does it work? RW-EDI process uses a porous ion exchange resin wafer with cm2 cross-section surface area.
When fed with low TDS feed e. The polishing of the RO product water is carried out by continuous electrodeionization EDI which is capable of producing water in excess of 18 megohm resistivity. Located in a severely water scarce area in Tarragona, our customer, Gas Natural, needed to convert seawater into ultrapure water for power production.
Retrieved from ” https: An electrolyte is a substance containing free ions that behaves as an electrically conductive syste. 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.
In some cases, the ion exchange resins actually contribute to the TOC content in the water. By eliminating the periodic regeneration requirement of ion exchange resin, environmental benefits are also realized by avoiding the handling and processing of acid and caustic chemicals brought to the site. Ions in the separate chamber are flushed to waste. The waste regenerants from these systems are usually combined, neutralized and released to the environment.
Reuse of residual water in food and beverages industry Chemical production Biotechnology Electronics Cosmetic Laboratories Pharmaceutical industry Boiler Feed Water Reduction of ionizable SiO 2 and TOC total organic carbon 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. A bipolar electrode is an electrode that functions as the anode of one cell and the cathode of another cell.
Argonne National Sysstem estimates that Second pass of RO Eliminates the need electroedionization a second bank of RO membranes and associated plumbing, pumping and control equipment.