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<br />t'-' <br />o <br />~ <br />Ii:... <br /> <br />CONCENTRATE <br />SIDE SPACER <br />--'- <br /> <br />spiral-wound <br /> <br />membrane module <br /> <br />- <br />PRODUCT <br />WATER , TO FRESH WATER BY PASSAGE <br />PRODUCT WATER FLOW' ~ THROUGH MEMBRANE <br />IAFTER PASSAGE ,--, . <br />THROUGH MEMBRANEI "'", <br />....\;;: ~ . <br />PROOUCT WATER SlOE .' " ,,~ ... <br />BACKING WITH MEMBRANES ,,:;-,,,~ '. <br />ON EACH SlOE , <br />, <br />" <br />\ \ <br />c... <br /> <br /> <br />..::~~:;: :;"::"~:.\.; ~JJit~~~~};~~f;1~~1~i!1tii~;~~i1/' <br /> <br />This process de- <br />signissonamed <br />because the <br />membrane is <br />wound into a spiral unit before being placed <br />into the pressure vessel. This has the ad. <br />vantage that the membrane and the sup- <br />POTt between the high. and low-pressure <br />sides of the membrane can be formed into <br />an ordinary commercial pipe so that a <br />special pressure vessel is not required. <br />This spiral is formed as shown in figure 18. <br /> <br /> <br />CONCENTRATED <br />SOLUTION <br />_ FLOW <br /> <br />r <br /> <br />.. <br /> <br />MEMBRANES <br /> <br />. <br /> <br />Ficl. 18. Splrrll-II.OUf/ci membl"lllle modu/t'. pflr!lully I/tlrolled. <br /> <br />One may think of the spiral as being a flat envelope <br />made up of the membrane with three sides seaJed and <br />one end "left open to transfer the product water to a <br />colleclOr lUbe attached at the open end. Within the <br />envelope is placed a plastic or glass fabric material <br />which is f:apable of withstanding the high pressures <br />on the outside of the enveJope but is sufficiently porous <br /> <br />to carry the product water to the collector lubE:. To <br />form the spiral, the envelope IS wrapped into a roll <br />around the central product-collecting lUbe. A coarsely <br />woven fabric is roBed \....ith the membrane envelope <br />to form a path for the salt water to flow through <br />the module from end [Q end over the membrane sur- <br />face. A schematic of an operating unH is shown in <br />figure] 9. <br /> <br />SALT <br />WATER .. <br />IN <br /> <br /> <br /> <br />.... PRODUCT <br />/ rOUT <br /> <br />PRESSURE VESSEL SPIRAL MODULE <br />14 IN, COMMERCIAL II TO J FT. LONGI <br />STEEL PIPEI <br /> <br />PRODUCT <br />COLLECTION <br />TUBE <br /> <br />PRESSURE <br />REGULATDR- <br /> <br /> <br />HIGH PRESSURE PUMP <br />1600 - 1500 PSII <br /> <br />... <br />BRINE <br />CONCENTRATE <br />OUT <br /> <br />flY. 19. SdU'II/fltic of splrul-woul/clllle'mbrclllt' module reverse osmosis plaut. <br />