METHOD FOR REMOVING DISSOLVED OXYGEN FROM SEA WATER OR BRINE IN DESALTING PROCESS BY REVERSE OSMOSIS METHOD

摘要

PURPOSE:To remove dissolved oxygen efficiently and to improve durability of a film module, by introducing sea water or brine into a deaeration column having a negative pressure space, and generating cavitation in the sea water or brine. CONSTITUTION:Sea water or brine 1 is pumped 2 through a feed pipe 3 and fine holes 5 into a deaeration column 4 maintained under negative pressure by the residual pressure of condensed water. Cavitation is generated in the sea water when the water passes through the hole 5 by which a large amt. of fine bubbles is generated in the treated water 1 and dissolved oxygen is removed. The treated water 1' deaerated in the column 4 is pressurized through a connecting pipe 6 by a high pressure pump 7 and is supplied into a reverse osmosis treatment tank 8, where the water is separated to the concd. water of the high residual pressure and the permeated water of the atmospheric pressure by the film module provided in the tank 8. The concd. water is injected to an ejector 10 connected to the column 4 and is then discharged through a discharge pipe 11.