Electro Deionization (EDI)

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AES Arabia Ltd.

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Achieving and maintaining ultrapure water (UPW) is extremely important in light of its widespread presence throughout the manufacture of semiconductor integrated circuits. Over the past few years, the industry's technology has developed so quickly that it has redefined the standards for cleanliness, particularly about the necessity of quantitatively eliminating metal ions, bacteria, pyrogens (bacterial fragments), colloidal silica, particles, and total organic carbon (TOC). A well-planned UPW system with well-positioned filters will guarantee that this objective is met because the kind of filter chosen in each of the crucial areas will have a quantifiable impact on the final quality.
Filters must fulfill the requirements of a high-purity deionized (DI) water system by:
not contaminate the effluent stream with organic, particulate, or metal ions.
Avoid shedding filter material or unloading trapped contaminants.
Be able to be tested for integrity to confirm removal ratings
Do the same thing from lot to lot.
Maintain a low-pressure drop for optimal economy and long life.
DI water:
Numerous carefully chosen filters and purifiers positioned in key locations will be part of a well-maintained UPW system. Water that has had its mineral ions eliminated, such as anions like chloride and bromide and cations from sodium, calcium, iron, and copper, is known as deionized water. Additionally, it is occasionally referred to as de-ionized water, DI water, or demineralized water (see spelling variations). The physical process of deionization involves binding to and filtering out the mineral salts from water using ion exchange resins that have been specially made. Since dissolved salts make up the majority of water impurities, deionization is a rapid, scale-free process that yields high-purity water that is typically on par with distilled water. However, aside from accidental trapping in the resin, deionization does not substantially eliminate uncharged organic molecules, viruses, or bacteria. Strong base anion resins that have been specially formulated can be used to eradicate gram-negative bacteria. One continuous and economical deionization technique is electrodeionization.
Electro deionization, or EDI:
Using electrically active media and an electrical potential to affect ion transport, electrodeionization is a water treatment method that eliminates ionizable species from liquids. In contrast to other water purification technologies, like traditional ion exchange, it doesn't call for the use of caustic and acidic chemicals. To further deionize Reverse Osmosis (RO) permeate to multi-megohm-cm quality water, EDI is frequently used as a polishing procedure.
The ionic transport characteristics of the active media, not the media's ionic capacity, determine the continuous electrodeionization (EDI) process's performance, setting it apart from other electrochemical collection/discharge processes like electrochemical ion exchange (EIX) or capacitive deionization (CapDI). Semi-permeable ion-exchange membranes and permanently charged media, like ion-exchange resin, are common components of EDI devices. The EDI process, also known as filled-cell electrodialysis, is essentially a combination of two well-known separation techniques: ion exchange deionization and electrodialysis.