World’s First 3-Stage RO Desalination Plant, Built by MHI, Begins

Tokyo, May 29, 2008 – Mitsubishi Heavy Industries, Ltd. (MHI), has completed the construction of the world’s first 3-stage reverse osmosis (RO) desalination plant in Rabigh, the Kingdom of Saudi Arabia. Employing the arrangement to serially connect three RO membrane units, this plant has an advantage in the construction of desalination plants, which produce low chloride ion concentrate water from seawater. MHI’s new RO desalination plant requires shorter construction period and uses less energy in desalination compared with multistage flash evaporating method plants that have been widely used in the Middle East but require more energy for evaporation.

The new desalination plant, which has begun to supply water, is capable to supply 7,000 tons of high-quality and high-purity desalinated water per hour. The plant was delivered to the Independent Water, Steam and Power Project (IWSPP) company, which name is Rabigh Arabian Water & Electricity Company (RAWEC), that was jointly established by Marubeni Corporation, JGC Corporation, Itochu Corporation and Arabian Company for Water and Power Development Ltd. (ACWA Power), a local independent power producer. RAWEC will supply industrial-use water to Rabigh Refining and Petrochemical Co. (PetroRabigh), one of the world’s largest joint ventures in integrated oil-refining and petrochemicals. PetroRabigh is equally owned by Saudi Aramco, a Saudi state oil company, and Sumitomo Chemical Co., Ltd. of Japan. Leveraging the commencement of operation of the world’s first commercial 3-stage RO desalination plant, MHI will aggressively explore business opportunities stemming from the needs for desalination to highly pure water .

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