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Product Information

Membrane method offers
cheapest way to create fresh water ever

Company to exclusively supply reverse osmosis membranes to
largest seawater desalination plant in U.S.A.

Membrane Div., Specialty Products Business Sector

2.3.2003

Nitto Denko Corporation’ American corporation, Hydranautics (Oceanside, California), which has been exclusively supplying spiral reverse osmosis membranes to a seawater desalination plant on the coast of Tampa, Florida, has just completed final delivery of the goods.
Scheduled to begin operating in February 2003, the seawater desalination plant will not only be the largest in the U.S. (capable of producing 100,000 m³ of fresh water per day), but will also be the world’s largest seawater desalination plant that uses hot cooling wastewater (seawater) of an adjacent thermoelectric power station as raw water.
A combination of saving energy by using hot wastewater, enhanced desalination efficiency by merit of the Nitto Denko’s new system that effectively utilizes two types of reverse osmosis membranes, together with lower plant construction cost has realized the most economical way to produce fresh water ever.

Background

There are various methods of desalinating seawater such as evaporation, electrodialysis, thermo-compression evaporation and reverse osmosis membrane. The reverse osmosis membrane method has become the most popular because of its low running cost, energy cost in particular.
Seawater desalination plants that use reverse osmosis have been built in arid areas of the world primarily in the United States, countries surrounding the Mediterranean Sea and the Middle East. In Japan as well, a desalination plant capable of producing 40,000m³ of fresh water per day is located in Chatan, Okinawa and there is one currently under construction in Fukuoka Prefecture (scheduled to start operating in April 2005). (Nitto Denko will provide membrane modules to both plants.)
Seawater desalination plants are also scheduled to be built on remote islands where it is difficult to collect rainwater and areas that require better water quality, so there appears to be a demand for reverse osmosis membranes in the future.
Nitto Denko and Hydranautics will continue to supply membrane modules that employ these membrane methods and are a key device of seawater desalination plants to the global freshwater generating plant market.

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