Canadian Plastics

RIM channels help clean wastewater

A direct-osmosis process has been developed to extract clean water from landfill wastewater and other waste liquids. Clean water, but not wastewater, passes through a supported cellulose-based membran...

June 1, 1999   Canadian Plastics



A direct-osmosis process has been developed to extract clean water from landfill wastewater and other waste liquids. Clean water, but not wastewater, passes through a supported cellulose-based membrane and into a salt water mixture, circulating through channels molded into the support plates, which are made from the Baydur GS 772 solid polyurethane reaction injection molding system from Bayer Corporation. Baydur’s processing characteristics include excellent chemical resistance, large part moldability and a high flexural modulus.

The Baydur system does not corrode when exposed to salt water, and withstands the high boiling temperatures of certain applications. The filtering technology was developed by OSMOTEK Inc. and MACTEC Environmental Technologies Company. The osmosis plates consist of two mirror-image panels, bolted together, with 900 molded-in channels (450 each side). Two U-shaped pieces, also made of the Baydur material, are bolted to top and bottom. When connected to another osmosis plate, these pieces form a pipe. The entire plate is then covered with a cellulose-based membrane.

Bayer Corporation 800/622-6004

(Circle 194)

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