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Electrodialysis for water desalination

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Electrodialysis for water desalination ( electrodialysis-water-desalination )

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energy consumption is considerably increased by the actual stack Ohmic resistance, diffusional losses and non-ideal permselectivity of homopolar and bipolar membranes [362]. A particularly interesting application of EBPM is the treatment and valorisation of waste brines from desalination plants [363–370]. The process is used to convert very concentrated NaCl (plus a number of additional minor elements) solutions into HCl and NaOH products. Through this novel application of EBPM, brine can be diluted to attenuate disposal issues and, at the same time, valuable products are obtained. Despite the clear environmental advantage, this application has to face a number of technical and economic barriers mainly related to membrane cost and performance (i.e. limited permselectivity and electroosmosis) and to the purity of the product streams due to the presence of minor elements in the feed brine. More details on potentials and limitations of this application can be found in [371]. Figure 20. Electrodialysis with bipolar membranes in a conventional three cell compartment configuration [362]. 6.2 Continuous electrodeionisation Continuous ElectroDeIonisation (CEDI) can be considered a hybrid process merging ion exchange deionisation and ED [372]. A typical CEDI unit has a similar configuration to ED, with alternating IEMs, concentrate and diluate compartments where feed solutions flow. Differently from ED, in CEDI at least one channel is filled with ion exchange resins. CEDI has two possible layouts. In the first the diluate channel is filled with mixed anion and cation exchange resins (Figure 21 (a)), while in the second anionic and cationic resins are placed in two different channels separated by a bipolar membrane (Figure 21 (b)) [10]. The presence of ion exchange resin particles inside the diluate compartment allows for a fast migration of ions through the channel from one membrane to the other, avoiding the limitation of low conductivity of dilute 67

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