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RPSEA Project 07122-12 TECHNICAL ASSESSMENT OF PRODUCED WATER TREATMENT TECHNOLOGIES 1st Edition Electrodeionization Electrodeionization (EDI) is a commercial desalination technology that combines ED and conventional IX technologies. It is used for the production of ultra-pure deionized water, especially in the semiconductor industry. The principle of the process is illustrated in Figure 10. A mixed-bed ion exchange resin or fiber is placed into the diluate cell of a conventional electrodialysis cell unit [63]. The function of the IX resins is to increase the conductivity in the substantially non- conductive water. At very low salt concentrations, the feed solution water is dissociated at the contact region of the cation- and anion-exchange resin beds, generating protons and hydroxyl ions that further replace the salt ions in the resins. The final result is completely deionized water as a product. The IX resins are regenerated via water splitting under current. The process can be performed continuously without chemical regeneration of the IX resin [63], and reduce the energy consumption when treating very diluted solutions [64]. The main disadvantage of the EDI process is the relatively poor current utilization. For industrial wastewater treatment, the precipitation of divalent metal hydroxide in EDI stack is a serious problem as a result of metal ions reacting with hydroxide ions present in the EDI stack. With current EDI stack configurations, EDI has not shown potential for treatment of produced water and beneficial use. EDI is not likely to be selected for treatment of CBM produced water due to high energy consumption compared to other membrane processes. No further assessment was conducted on EDI because of the limited information in the literature and its poor potential application in produced water treatment. Figure 10. Production of ultrapure water with EDI technology (Source: [63]). Back to the list of technologies 38PDF Image | TECHNICAL ASSESSMENT OF PRODUCED WATER TREATMENT TECHNOLOGIES
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