FRESH WATER OBTAINED FROM DEEP SEA WATER, CONCENTRATED DEEP SEA WATER, MINERAL CONCENTRATE, CONCENTRATED SALT WATER, BITTERN, AND SPECIFYED SALT

摘要

PROBLEM TO BE SOLVED: To obtain fresh water, concentrated deep sea water, concentrated mineral liquid, and concentrated salt water by separating the Japan Sea water in multiple steps, and obtain bittern and specifyed salt by heating and filtering the concentrated salt water. SOLUTION: The Japan Sea water is separated by an electrodialyzer 2 using an ion exchange membrane 12 to obtain the fresh water B from which salts have been mainly removed and the concentrated deep water C from which moisture has been mainly removed. The concentrated deep water C separated by at least one of a reverse osmosis membrane device 1 using a reverse osmosis membrane 11 and the electrodialyzer 2 using the ion exchange membrane 12 is further separated by an electrodialyzer 3 using an ion exchange membrane 13 having monovalent ion selectivity to obtain the concentrated mineral liquid D mainly composed of multivalent ions by removing monovalent ions and the concentrated salt water E mainly composed of monovalent ions by removing multivalent ions. The concentrated salt water E is heated and filtered by a dehydration and separation means 4 to obtain the bittern F and the specifyed salt G.