Dow Water & Process Solutions News: Dow Water & Process Solutions’ Dual-Membrane Technology Enables Blow Down Reuse in Gaojing Power Plant

Dow Water & Process Solutions’ Dual-Membrane Technology Enables Blow Down Reuse in Gaojing Power Plant

Integrated technology helps realize more than 70% reuse of cooling tower blow down

Minneapolis - August 20, 2009

For the past 40 years, the Gaojing Power Plant has supplied heat and electricity to its local communities and industries. Facing increased environmental regulations from the Chinese government in 2003, the plant enlisted DOW™ Ultrafiltration modules and DOW™ FILMTEC™ brackish water reverse osmosis elements as a solution for reuse using the blow down from their cooling towers as boiler feed water.

"Water recycling systems for cooling tower blow down have become more common in fossil fuel power plants because of the large volume of wastewater needed," said Kelvin Cheung, strategic marketing manager for Dow Water & Process Solution. "Coupled with the proper pretreatment and chemical dosing, DOW Ultrafiltration modules and FILMTEC membranes help eliminate problems in subsequent wastewater reuse systems."

Located in Mengtougou and constructed in the 1960s, Gaijing is one of the earliest power plants built by Datang Corporation in Beijing. Traditionally, the source of the cooling tower makeup was from surface water, but was changed to secondary effluent from the Gaobeidian Municipal Wastewater Treatment Plant in 2007. Due to the wastewater's concentration, contaminants varied substantially with seasons and cooling tower makeup quality.

Dow Water & Process Solutions' dual-membrane technology was able to overcome a waste stream containing high hardness, alkalinity, silicon dioxide and sulfate, typical in cooling water blow down to help the power plant meet increasing environmental requirements from the government. The integrated technology, together with proper pretreatment and chemical dosing, helped the plant to realize more than 70 percent reuse of the cooling tower blow down-even after five years of operation.

This dual-membrane solution consists of DOW™ Ultrafiltration SFP-2660 and DOW™ FILMTEC™ BW30-365FR and BW30-400 reverse osmosis membranes. To learn more about Dow Water Solutions' innovative solutions, or view this case study in its entirety, visit www.dowwatersolutions.com.

About Dow Water & Process Solutions

Dow Water & Process Solutions has a 50 year legacy of providing innovative water and process solutions to both communities and industries alike. A differentiated business unit of The Dow Chemical Company, Dow Water & Process Solutions offers a broad portfolio of ion exchange resins, reverse osmosis membranes, ultrafiltration membranes and electrodeionization products, with strong positions in a number of major application areas, including industrial and municipal water, industrial processes, pharmaceuticals, power, residential water and wastewater and water reuse. More information about Dow Water & Process Solutions can be found at www.dowwatersolutions.com.

About Dow

®™^* Trademark of The Dow Chemical Company ("Dow") or an affiliated company of Dow

For Editorial Information:

Karen Jayne Leinberger
The Dow Chemical Company
+952.897.4364

	Dow Water & Process Solutions
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