Pilot Projects to Generate Renewable Energy from Water
By October 20th, 2009Tuesday, October 20, 2009 14:12 on
The first company, Norway’s state-owned power utility, is trying to harness osmotic power. It is building the world’s first large-scale prototype facility for developing a form of salt power called pressure-retarded osmosis. By the end of November this facility is expected to begin operation in Norway.
The $5 million prototype will place fresh water and brine on either side of a semi-permeable membrane that allows water to pass but stops salt on one side. This generates pressure equivalent to a column of water 120m high. This pressurized water is then used to turn a turbine to generate electricity.
The second company is a Dutch firm and it is trying to generate “salt power”. he technology relies on reverse electrodialysis, where a series of fresh and saltwater streams are pushed into underground pipes to opposite sides of two kinds of membranes. These membranes allow the passage of sodium or chloride ions, which builds an electrical current across the membranes.
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