Title:
【発明の名称】電気透析淡水化方法及び装置
Document Type and Number:
Japanese Patent JPH0757309
Kind Code:
B2
Abstract:
PURPOSE:To make it possible to directly utilize fluctuating power supply with almost no electricity storage, by suitably selecting the proportions of electrodialysis tanks for respective desalting operations at respective salt concentration levels, in a process in which original water is step-wise desalted so as to have a medium salt concentration and then to have a low salt concentration through step-wise performed batch operations employing a plurality of electrodialysis tanks. CONSTITUTION:Original water from an original water tank 9 is desalted in a plurality of electrodialysis tanks 8, while salt water is being circulated through a circulating tank 10. In this electrodialysis apparatus for turning salt water into fresh water, either of two operations can be selected: a high concentration operation in which the original water is desalted to the extent that it has a salt concentration intermediate between the salt concentration of the original water and that of fresh water, and fed to a storage tank 11 for intermediate-concentration water; and a low concentration operation in which the intermediate- concentration water is desalted and turned into fresh water, and fed to a fresh water storage tank 12. In the case where there is a large amount of electric power supply to the apparatus for turning salt water into fresh water, the proportion of electrodialysis tanks for high concentration operation is heightened. On the other hand, in the case where the amount of electric power available is small due to the fluctuations in the amount of electric power generated or the increase in the electric power consumption by other equipments, the proportion of electrodialysis tanks for low concentration operation is heightened. Thus, the amount of electric power consumed by the whole apparatus for turning salt water into fresh water is controlled with time to proper values.
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Inventors:
Kuroda Osamu
Katsuya Ehara
Takayoshi Hashikichi
Ryota Doi
Toshio Ogawa
Katsuya Ehara
Takayoshi Hashikichi
Ryota Doi
Toshio Ogawa
Application Number:
JP22975087A
Publication Date:
June 21, 1995
Filing Date:
September 16, 1987
Export Citation:
Assignee:
株式会社日立製作所
バブコック日立株式会社
バブコック日立株式会社
International Classes:
B01D61/54; C02F1/469; (IPC1-7): B01D61/54; B01D61/54; C02F1/469
Domestic Patent References:
| JP60168504A |
Attorney, Agent or Firm:
Yusuke Hiraki
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