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Study on Seawater Desalination of Dispersive Source with Electrodialysis for Straight-Through and Segmented Concentrate Discharge
Pages: 65-71
Year: Issue:  3
Journal: Ocean Technology

Keyword:  straight-through typesegmented discharge of concentrateelectrodialysisdispersive sourceseawater desalination;
Abstract: In order to promote and industrialize the application of electrodialysis in the field of dispersive source seawater desalination, the experiment was designed to solve the problem of high energy consumption in the process of electrodialysis desalination process. This paper studies the effects of different discharge segments of concentrated brine on the process efficiency, energy consumption and water migration of electrodialysis desalting process. The results show that the efficiency of desalination can be greatly improved. Among them, the desalination effect of four segments is optimal, relative to the conventional way of one segment straight discharge of concentrated water. When desalting from 35 000 mg/L to 500 mg/L, the time needed can be shorten by about25 min, the water osmotic quantity from the diluted chamber to concentrated chamber can reduce by 35.4%, the specific energy consumption in producing 1 ton of freshwater has reduced by 31.6%, and the efficiency can be enhanced by about 26%. Therefore, the desalting effect has been substantially improved by the desalting method of segmented discharge of concentrate.
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