Patent ID: 9206060
Filing Date: 2015-12-08
Classification: B01D,C02F,Y02A

Abstract:
1. A method for purifying liquids, comprising the following steps: (a) performing a first phase liquid purification including providing a plurality of first phase reverse osmosis units, the first phase reverse osmosis units arranged in series with one another from a first reverse osmosis unit to a last reverse osmosis unit, each of the first phase reverse osmosis units having a concentrate side, a permeate side, and a reverse osmosis membrane separating the concentrate side from the permeate side, the concentrate side of each of the first phase reverse osmosis units communicating with the concentrate side of the next reverse osmosis unit in succession, the permeate side of each of the first phase reverse osmosis units communicating with the permeate side of the preceding reverse osmosis unit in succession; (b) providing a nanofiltration OR electrodialysis device communicating with at least the concentrate side of the first reverse osmosis unit of the first phase reverse osmosis units; (c) providing a metals and solids recovery device communicating with the nanofiltration OR electrodialysis device; (d) providing a solvent recovery device communicating with the metals and solids recovery device; and (e) processing liquid through the nanofiltration OR electrodialysis device, the metals and solids recovery device, and the solvent recovery device, wherein the nanofiltration OR electrodialysis device, the metals and solids recovery device, and the solvent recovery device are disposed in series with one another; (f) performing a final phase liquid purification including providing at least one final phase reverse osmosis unit, the final phase reverse osmosis unit having a concentrate side, a permeate side, and a reverse osmosis membrane separating the concentrate side from the permeate side, the concentrate side of the final phase reverse osmosis unit communicating with the permeate side of the first reverse osmosis unit in the series of first phase reverse osmosis units; wherein the first phase liquid purification includes successively receiving a feed stream of saline liquid in the concentrate side of the first phase reverse osmosis units, forcing pure water from the concentrate side into the permeate side of the reverse osmosis units by reverse osmosis, transferring at least a portion of concentrate from the concentrate side of the last reverse osmosis unit into the permeate side of the last reverse osmosis unit to form a mixed permeate, and successively receiving a mixed permeate in the permeate side of the reverse osmosis units preceding the last reverse osmosis unit; and the final phase reverse osmosis includes receiving a feed stream of mixed permeate in the concentrate side of the final phase reverse osmosis unit, forcing pure water from the concentrate side of the final phase reverse osmosis unit into the permeate side of the final phase reverse osmosis unit, and releasing the pure water from the permeate side of the final phase reverse osmosis unit to provide purified liquid.