SEAWATER DESALINATION APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a seawater desalination apparatus in which the filtration performance of an RO (Reverse Osmosis) membrane is kept and the fluid pressure energy of concentrated seawater is recovered effectively. SOLUTION: The seawater desalination apparatus includes: the RO membrane 4 for removing salt from seawater; a volumetric and hydraulic pump 2 for pressurizing seawater and sending the pressurized seawater to the RO membrane 4; a main drive motor 1 for driving the hydraulic pump 2; a volume-type power-recovery hydraulic motor 3 for driving the hydraulic pump 2 by means of the fluid pressure of the concentrated seawater which is not filtered by the RO membrane 4; a pressure detector 5 for detecting the reverse osmosis pressure of the RO membrane 4; and a reverse osmosis pressure feedback control means for controlling the operation of the hydraulic pump 2 on the basis of the value detected by the pressure detector 5 so that the reverse osmosis pressure of the RO membrane 4 approaches a target value. COPYRIGHT: (C)2011,JPO&INPIT