The effect of electrical potential of microbubbles on reverse osmosis method and its application to seawater desalination

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The reverse osmosis (RO) method is a method obtaining the fresh water by using semi permeable RO membrane. However, the RO method has to give continuous operation at high pressure in seawater desalination plants. In the present study, in order to improve the efficiency of RO desalination under low pressure conditions, the water treatment system is proposed by using microbubbles in salt water disposal. The RO desalination efficiency can be improved by microbubble generation in salt water. The effect of the microbubbles on the rate of osmosis was also investigated by measurements of the electric conductivity of microbubbles. The electrical conductivity of salt water decreases with increasing the electrical property of the gas.water interface (the ζ-potential) of microbubbles. Microbubbles with a high electrical potential of high number density in salt water can exist in salt water because the shrinking rate of microbubbles becomes smaller with increasing the high electrical potential of microbubbles. Furthermore, in the measurements of electrical conductivity using anion-exchange and cation-exchange membranes in the cell, it was confirmed that the microbubbles with negatively charged absorbed sodium ions in salt water.