A preliminary technical and economic investigation of sea water demineralization by ion-exchange for calcium and bicarbonate ions and their subsequent removal by thermal decomposition (1)

John P. Ranck, Elizabethtown College


Considerations in the choice of a thermolytic salt to be exchanged for the ions in sea water are discussed. The literature relating to the decomposition and regeneration of calcium bicarbonate solutions is reviewed. Capital and operating costs for a plant producing one million gallons of demineralized water per day are calculated by the procedure suggested by the U.S. Office of Saline Water. Net cost is estimated to be $1.89 per thousand gallons, but could drop as low as $0.41 per thousand gallons if the process is credited with the value of by-products. © 1969.