Oasys Water, Inc.

Nathan T Hancock

Marek S Nowosielski-Slepowron

Christopher Drover

George H Bischoff

Zachary Helm

Garrett Akie

Separation processes using osmotically driven membrane systems are disclosed generally involving the extraction of solvent from a first solution to concentrate solute by using a second concentrated solution to draw the solvent from the first solution across a semi-permeable membrane.

Osmotic separation systems and methods

The invention generally relates to osmotically driven membrane systems and processes and more particularly to systems and processes for handling feed streams without pretreatment and increased brine concentration for zero liquid discharge, including forward osmosis separation (FO), direct osmotic concentration (DOC), pressure-assisted forward osmosis (PAFO), and pressure retarded osmosis (PRO). The system includes: a plurality of forward osmosis units, each having a semi-permeable membrane assembly and a tank; and a separation system in fluid communication with the plurality of forward osmosis units and configured to separate the dilute draw solution into the concentrated draw solution and a solvent system.

Separation processes using osmotically driven membrane systems are disclosed generally involving the extraction of solvent from a first solution to concentrate a solute by using a second concentrated solution to draw the solvent from the first solution across a semi-permeable membrane. Pre-treatment and post-treatment may also enhance the osmotically driven membrane processes.

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Boston, MA, United States of America

Nathan T Hancock