Dow ADSORBIA media removes arsenic from Harrah's Atlantic City construction site

After encountering groundwater at an excavation site contaminated with naturally occurring arsenic, among other impurities, Harrah's Atlantic City Casino worked with Siemens Water Technologies Corp. to install a water purification system using ADSORBSIA GTO titanium-based arsenic removal media from Dow Chemical. The system was installed in June of this year, reducing the arsenic from over 50 ppb to non-detectable levels and allowing groundwater at the site to be discharged easily and safely...

ADSORBSIA™ GTO™ media included in Siemens Water Technologies system employed to remediate groundwater at up to 1,000 gallons per minute.

MIDLAND, MI, Nov. 17, 2006 -- After encountering groundwater at an excavation site contaminated with naturally occurring arsenic, among other impurities, Harrah's Atlantic City Casino worked with Siemens Water Technologies Corp. to install a water purification system using ADSORBSIA™ GTO™ titanium-based arsenic removal media from The Dow Chemical Company.

The system has been working successfully since it was installed in June of this year, reducing the arsenic (As) levels from more than 50 ppb to non-detectable levels and allowing groundwater at the site to be discharged easily and safely so that construction can continue.

By utilizing ADSORBSIA media, Siemens engineered a system that is able to treat up to 1000 gallons per minute, while minimizing the amount of media used. The design took advantage of the media's fast kinetics and high capacity to provide effective arsenic removal. Adopting the ADSORBSIA GTO single-use media also assures that the arsenic removed from the groundwater does not re-enter the environment.

"This media was originally designed to offer a cost effective approach to the removal of arsenic from small community water systems. But it is also well suited to construction dewatering projects like this one," said Alan Greenberg, senior marketing development manager, Dow Water Solutions New Business Development. "We are committed to working closely with innovative, customer focused companies to provide better options for removing toxic contaminants from groundwater supplies."

"ADSORBSIA titanium-based media offers significant performance advantages and capabilities over other competing technologies,. It has a patented titanium oxide based, nanocrystalline structure that leads to fast kinetics and high capacity, enabling water treatment systems such as the ones developed by Siemens to use smaller vessels, faster flow rates and a smaller system footprint. The media also removes both As (III) and As (V) without pretreatment, under all pH conditions.

The high capacity of ADSORBSIA media makes it an ideal, non-regenerable single-use product, that offers an affordable, easy-to-operate approach to arsenic removal. Eliminating the need for regeneration also avoids the hassle and the cost of chemical storage, and overcomes potential issues associated with the disposal of arsenic-laden waste regenerant streams. ADSORSBIA media has a strong affinity for arsenic and maintains its hold on the arsenic that has been adsorbed making media disposal easier and safer.

Dow Water Solutions, with revenues of approximately $350 million, is a performance-based business unit comprised of leading world-class brands and enabling component technologies designed to advance the science of water purification around the world, including seawater desalination, contaminant removal and water reuse. With more than 1,000 employees worldwide, the business maintains five production facilities globally to manufacture, market and sell FILMTEC™ reverse osmosis membranes, DOWEX™ ion exchange resins, ADSORBSIA GTO titanium-based arsenic removal media, ultrafiltration, and electrodeionization; as well as premier water purification systems in China. For additional information about Dow Water Solutions products, visit www.dowwatersolutions.com.

Dow is a diversified chemical company that harnesses the power of science and technology to improve living daily. The Company offers a broad range of innovative products and services to customers in more than 175 countries, helping them to provide everything from fresh water, food
and pharmaceuticals to paints, packaging and personal care products. Built on a commitment to its principles of sustainability, Dow has annual sales of $46 billion and employs 42,000 people worldwide. References to "Dow" or the "Company" mean The Dow Chemical Company and its consolidated subsidiaries unless otherwise expressly noted.

For more information about ADSORBSIA arsenic removal media, visit www.adsorbsia.com.

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Also see: "FILMTEC membranes purify water for Katrina victims"

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