BACKGROUND The OHSU Center for Health & Healing, a LEED Platinum medical office building in the Pacific Northwest,* utilizes a membrane bioreactor to treat waste water from the building. Treated water from the bioreactor is used as cooling tower make-up. During hot weather, the needed blowdown rate of the tower exceeds the input capacity of the bioreactor, which can treat up to 35,000 gallons per day. To avoid exceeding capacity, the blowdown rate was reduced, leading the tower to increase cycles of concentration as high as 8. These high cycles, combined with the difficult water quality, resulted in scaled chillers that required acid cleaning. New Nalco Technology Significantly Improves Chiller Cleanliness at CBRE RIMCO Portland CH-1712 CASE STUDY – INSTITUTIONAL PROPOSED SOLUTION A water analysis and equipment evaluation was conducted in cooperation with the Portand State University's Civil and Environmental Engineering Department. Following a careful study of the challenges faced, which included effectiveness, equipment size, energy efficiency, serviceability, capital requirements, operating costs and waste disposal needs, the engineering team along with a select group of university undergraduates, determined that Nalco’s 3D TRASAR ™ Water Saver ™ Technology was the optimal solution. The 3D TRASAR Water Saver program, Nalco’s newest water treatment technology, is a comprehensive program that includes on-line water conditioning, Nalco chemistry, service, and 24/7 monitoring via Nalco’s patented (Continued on Reverse Side) *At its opening, the Oregon Health & Science University (OHSU) Center for Health & Healing is one of the largest LEED Platinum projects in the nation and the first medical facility in the world to be built to this standard. (http://www.ohsu.edu/xd/about/visiting/locations/chh.cfm). This site is currently managed and operated by a team from CBRE Global Corporate Services. Parameter Before WS After WS Savings Scale/corrosion inhibitor usage (lb/yr) 435 138 297 Acid (lb/yr) Not used Not used -- Tower biocide No change No change --