Methods for reducing boron concentration in high salinity liquid
AssigneeHydranautics
InventorsMark Wilf, Craig R. Bartels, Masahiko Hirose
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Abstract
Methods of treating a high salinity liquid, such as seawater, containing boron are provided, including adjusting the pH of the liquid to about 8 to about 9.5, optionally adding a scale inhibitor to the liquid, passing the liquid through a reverse osmosis device, and recovering a permeate having a boron concentration less than about 2 ppm. One embodiment includes removing colloidal matter from the liquid using a membrane filtration system, such as ultrafiltration or microfiltration, prior to passing the liquid through the reverse osmosis device, and preferably prior to adjusting the pH of the liquid.
Claims20
A desalination treatment method for high salinity, boron-containing liquid, including a method of reducing a boron concentration in the high salinity, boron-containing liquid, the boron reduction method consisting essentially of the following steps:
- (a) increasing a pH of a non-softened, high salinity liquid to about 8 to 9.5;
- (b) passing the pH-increased, non-softened, high salinity liquid through at least one reverse osmosis device;
- and
- (c) recovering a permeate from the at least one reverse osmosis device wherein the permeate has a boron concentration of less than about 2 ppm.
Dependencies are inferred from the claim text.