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2006-08-05 News Headlines
Process technology exclusive license in water purification industry Dow signs exclusive licensing agreement of Zero Discharge Desalination water purification process technology for desalination of seawater and brackish water with ZDD.
The Dow Chemical Company announces it has signed a licensing option and
evaluation agreement with South Carolina-based ZDD, Incorporated, giving
Dow exclusive rights to elect an exclusive license to ZDD, Incorporated’s
Zero Discharge Desalination (ZDD) process technology for desalination
of seawater and brackish water. The patent-pending ZDD process technology utilizes a unique combination of reverse osmosis or nanofiltration membranes and electrodialysis cells that enables water treatment facilities to recover potentially saleable salts and greater amounts of pure filtered water. It also minimizes or eliminates the production of concentrated brine, the disposal of which represents a substantial cost associated with water treatment in coastal and, in particular, inland locations. “Desalination is an extremely efficient and viable process for addressing global water shortages, and this multi-faceted technology brings additional advantages in energy efficiency, low cost and zero or near-zero liquid discharge,” said Karen Dobson, global market manager, FILMTEC™ membranes. “By gaining exclusive rights to this technology, Dow can now provide an enhanced component offering, allowing us to be an even more valuable supplier to our global OEM customer base.” As part of the ZDD process, brine streams containing sparingly soluble salts are treated with electrodialysis to separate the anions and cations of the salts into two separate streams. These ions are then paired with appropriate cations and anions to form salts that are more soluble in the two streams. Additional pure water is recovered through this process from the separated brine streams and ultimately the concentrates are remixed and the insoluble salts that precipitate are separated and potentially sold. ZDD technology was originally developed by Thomas A. Davis, Ph.D., Department of Chemical Engineering at the University of South Carolina and was licensed to ZDD, Incorporated by the University as part of its program to encourage commercialization of its technologies. Davis, research professor and Walker Rast, alumnus of the university, are currently the principals of ZDD, Incorporated. The University has filed two patents on the technology, one for use with seawater and the other for inland desalination and agricultural water treatment. The ZDD, Incorporated agreement is the latest move by Dow that demonstrates
its commitment to maintaining a leadership role in the water purification
industry. The company recently acquired Zhejiang Omex Environmental Engineering
Ltd. in China, giving it access to Ultrafiltration (UF), Membrane Bio-Reactor
(MBR) membranes, and Electrodeionization (EDI) technologies. The company
also announced a major expansion of its FILMTEC membrane production capabilities
in Minneapolis, Minnesota. Dow provides highly productive and effective separations solutions based
on FILMTEC reverse osmosis (RO) and nanofiltration (NF) elements, DOWEX™
ion exchange resins and ADSORBSIA™ GTO™ titanium-based arsenic
removal media. Dow is the only global manufacturer of both membrane and
ion exchange products.
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