| 摘要 |
<p>A forward osmosis purification unit comprises an inlet chamber into which an unpurified feed solution is introducible, an outlet chamber, and a dual membrane section. The dual membrane section comprises a first semi-permeable membrane in fluid communication with the inlet chamber, a second semi-permeable membrane in fluid communication with the outlet chamber, a plurality of expandable cells interposed between the first and second membranes, and a draw solution of an osmotic pressure significantly greater than the osmotic pressure of the feed solution. A sufficient amount of solvent is permeable through the first membrane to increase the hydraulic pressure of the draw solution within the cells while solutes of the feed solution are substantially rejectable. The hydraulic pressure of the draw solution is sufficiently high to force the permeate to be discharged from the second membrane to the outlet chamber while the draw agent is substantially rejected.</p> |
