公开(公告)号：EP1809408A2

公开(公告)日：2007-07-25

申请号：EP05796110.4

申请日：2005-09-13

申请人： UNIVERSITY OF SOUTH CAROLINA

发明人： DAVIS, Thomas, A.

IPC分类号： B01D61/02 ,  B01D61/42

CPC分类号： B01D61/44 ,  B01D61/022 ,  B01D61/025 ,  B01D61/027 ,  B01D61/422 ,  B01D61/445 ,  B01D61/48 ,  B01D61/52 ,  B01D61/58 ,  C01D3/06 ,  C01F11/46 ,  C02F1/441 ,  C02F1/469 ,  C02F1/4693 ,  C02F1/5236 ,  C02F5/00 ,  C02F2101/103 ,  C02F2103/08 ,  Y02A20/131 ,  Y02A20/134

摘要： A process and system for purifying water is disclosed. For example, in one embodiment, the process may be used to remove a divalent salt, such as calcium sulfate, from a water source in order to prevent the divalent salt from precipitating during the process. The water source, for instance, may be fed to an ion separating device, such as an electrodialysis device. In the electrodialysis device, an ion exchange takes place between the divalent salt and another salt, such as a monovalent salt to produce two concentrated salt streams that contain salts having greater solubility in water than the divalent salt. In one embodiment, the two salt streams that are produced may then be combined to precipitate the divalent salt in a controlled manner. During the process, various other components contained within the water feed stream may also be removed from the stream and converted into useful products. In one particular embodiment, the process is configured to receive a byproduct stream from a reverse osmosis process.

公开(公告)号：EP1809408B1

公开(公告)日：2012-03-21

申请号：EP05796110.4

申请日：2005-09-13

申请人： UNIVERSITY OF SOUTH CAROLINA

发明人： DAVIS, Thomas, A.

IPC分类号： B01D61/02 ,  B01D61/42

CPC分类号： B01D61/44 ,  B01D61/022 ,  B01D61/025 ,  B01D61/027 ,  B01D61/422 ,  B01D61/445 ,  B01D61/48 ,  B01D61/52 ,  B01D61/58 ,  C01D3/06 ,  C01F11/46 ,  C02F1/441 ,  C02F1/469 ,  C02F1/4693 ,  C02F1/5236 ,  C02F5/00 ,  C02F2101/103 ,  C02F2103/08 ,  Y02A20/131 ,  Y02A20/134

摘要： A process and system for purifying water is disclosed. For example, in one embodiment, the process may be used to remove a divalent salt, such as calcium sulfate, from a water source in order to prevent the divalent salt from precipitating during the process. The water source, for instance, may be fed to an ion separating device, such as an electrodialysis device. In the electrodialysis device, an ion exchange takes place between the divalent salt and another salt, such as a monovalent salt to produce two concentrated salt streams that contain salts having greater solubility in water than the divalent salt. In one embodiment, the two salt streams that are produced may then be combined to precipitate the divalent salt in a controlled manner. During the process, various other components contained within the water feed stream may also be removed from the stream and converted into useful products. In one particular embodiment, the process is configured to receive a byproduct stream from a reverse osmosis process.

公开(公告)号：EP1534409A2

公开(公告)日：2005-06-01

申请号：EP03749003.4

申请日：2003-08-01

申请人： The University of South Carolina

发明人： DAVIS, Thomas, A.

IPC分类号： B01D61/02

CPC分类号： C02F1/441 ,  B01D61/025 ,  B01D61/027 ,  B01D61/422 ,  B01D61/44 ,  B01D61/52 ,  B01D61/58 ,  C02F1/048 ,  C02F1/442 ,  C02F1/444 ,  C02F1/469 ,  C02F1/4693 ,  C02F9/00 ,  C02F2103/08 ,  C02F2201/46115 ,  Y02A20/128 ,  Y02A20/131 ,  Y02A20/134 ,  Y02W10/37

摘要： Sodium chloride and purified water are recovered by treating salt water that contains sodium chloride with an integrated reverse osmosis and electrodialysis system, which includes an efficiency-enhancing feature that is one or more of the following: the use of univalent anion and univalent cation selective membranes in the electrodialysis unit; the addition of a nanofiltration unit to process the diluate from the electrodialysis unit; or operation of the electrodialysis unit at an elevated pressure. Magnesium and bromine can optionally be produced when the salt water contains these materials.