Desalination system and desalination method
This desalinization system, which obtains industrial-use water and drinking water from seawater and wastewater, is provided with: a purification device that purifies wastewater by removing activated sludge therefrom; a first RO membrane that removes salt from the output of the purification device by transferring said salt to first concentrated water, thereby producing industrial-use water; a UF membrane that seawater passes through and that removes particulates from said seawater; a second RO membrane that removes salt from the treated output of the UF membrane by transferring said salt to second concentrated water, producing drinking water; an agitation device to which the second concentrated water from the second RO membrane and the first concentrated water from the first RO membrane are sent to be agitated; and a third RO membrane removing salt from the liquid mixture agitated by the agitation device by transferring said salt to third concentrated water, producing industrial-use water.
1. A sea-water desalination system for acquiring industrial water and drinking water from sea-water and sewage water, comprising:
a purification apparatus for
purifying sewage water;
a first RO membrane for
generating industrial water and a first concentrated-water from the sewage water that has been purified by the purification apparatus;
a UF membrane for removing particles in sea-water by permeating the sea-water;
a second RO membrane for
generating a second concentrated-water and drinking water from permeated water that has been filtered by the UF membrane;
a stirring apparatus for stirring the second concentrated-water generated by the second RO membrane and the first concentrated-water generated by the first RO membrane being sent thereto; and
a third RO membrane for
generating a third concentrated-water and the industrial water from mixture fluid stirred by the stirring apparatus.
2. A sea-water desalination system according to claim 1 , comprising at least either of a first energy recovery device for recovering pressure energy of the second concentrated-water or a second energy recovery device for recovering pressure energy of the third concentrated-water.
3. A sea-water desalination system according to claim 1 , wherein the first RO membrane is configured to operate at a permeation pressure of approximately 1 to 2 MPa; the second RO membrane is configured to operate at a permeation pressure of approximately 6 to 8 MPa; and the third RO membrane is configured to operate at a permeation pressure of approximately 6 to 8 MPa.