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Enhanced brine concentration with osmotically driven membrane systems and processes

A technology of driving membrane and forward osmosis, which is applied in the field of osmosis-driven membrane system and treatment, and can solve the problems of cost, environment, and low efficiency of recovery and treatment

Inactive Publication Date: 2017-08-29
OASYS WATER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this configuration requires venting of non-condensable gases, loss of draw solutes and possible environmental concerns
Furthermore, prior art draw solute recovery systems require considerable energy input (e.g., direct steam or electricity), which makes the recovery process inefficient and expensive
[0004] Furthermore, many prior art techniques for concentrating feed streams generally (especially without the use of complex and / or very energy-intensive equipment) do not adequately remove all of the water or other solvents from the stream (i.e. , ZLD), which in turn makes it expensive and impractical to maximize the concentration of the feed stream to meet the ZLD requirement

Method used

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  • Enhanced brine concentration with osmotically driven membrane systems and processes
  • Enhanced brine concentration with osmotically driven membrane systems and processes
  • Enhanced brine concentration with osmotically driven membrane systems and processes

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Embodiment Construction

[0031] Various embodiments of the present invention can be used with any osmotically driven membrane method, such as FO, PRO, OD, DOC, etc. Osmosity-driven membrane processing for solvent extraction from a solution generally involves exposing the solution to a first surface of a forward osmosis membrane. In some embodiments, the first solution (referred to as the treatment or feed solution) may be seawater, brackish water, wastewater, sewage, treatment stream, or other aqueous solution. In at least one embodiment, the solvent is water; however, other embodiments may use non-aqueous solvents. A second solution (referred to as a draw solution) having a high concentration of solutes relative to the first solution is exposed to a second surface of the forward osmosis membrane opposite the first surface. The solvent (eg, water) of the first solution can then be drawn through the forward osmosis membrane and into the second solution, which produces a solvent-rich solution via forwa...

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Abstract

The invention generally relates to osmotically driven membrane systems and processes and more particularly to increased brine concentration for zero liquid discharge using osmotically driven membrane systems and processes and the related draw solute recovery techniques for the osmotically driven membrane systems and processes.

Description

technical field [0001] The present invention relates generally to osmotically driven membrane systems and processes, and more particularly to the use of osmotically driven membrane systems and processes to increase brine concentration for zero liquid discharge (ZLD). The present invention also relates to associated draw solute recovery techniques for osmotically driven membrane systems and processes. Background technique [0002] In general, osmotically driven membrane processing involves two solutions separated by a semipermeable membrane. One solution may for example be seawater, while the other solution is a concentrated solution, which is used to create a concentration gradient between seawater and the concentrated solution. This gradient drives water in seawater into a concentrated solution through a membrane that selectively allows water to pass and not salt to pass. Gradually, the water entering the concentrated solution dilutes the solution. Solutes then need to b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D37/00C02F1/44C02F1/28C02F1/02C02F11/122C02F11/127C02F11/13
CPCC02F1/04C02F1/447C02F11/122C02F11/127C02F2001/5218C02F2103/08C02F2303/16C02F2303/18B01D61/005Y02W10/30C02F1/445C02F11/13B01D61/0023B01D61/0022C02F2201/002
Inventor 扎卡里·W·古德曼利亚·斯塔斯奇克玛丽·特丽萨·彭德格斯特
Owner OASYS WATER