Geothermal desalination

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Geothermal desalination is a process under development for the production of fresh water using heat energy. Claimed benefits of this method of desalination are that it requires less maintenance than reverse osmosis membranes and that the primary energy input is from geothermal heat, which is a low-environmental-impact source of energy.

Circa 1995, Douglas Firestone from Nevada devised the use of geothermal water directly as a source for desalination. The experiment was successful and a proof of concept, proving that geothermal waters could be used as process water to produce potable water in 2001. In 1998, Autek LLC worked with Firestone to design a direct-use evaporation/condensation open air loop desalination device that would use geothermal heat to raise the temperature of saline water from the ocean or other sources into approaching 100 °C (212 °F). Douglas Firestone created the device in Santee California, and transported it to San Diego State University College of Sciences in August of 2004 where Adj. Professor Ronald A. Newcomb set up a Geothermal Desalination Laboratory, and served as the P.I. for SDSU Research Foundation to test the device, modifications, and other prototypes.

In 2005 to 2009 testing was completed on sixth prototypes of the devices referred to as a Delta T devices, a closed air loop, atmospheric pressure, evaporation condensation loop geothermally powered desalination device. The device used filtered sea water from Scripps Institution of Oceanography and reduced the salt concentration from 35,000 ppm to 51 ppm.

A total of six prototypes and six modifications demonstrated that, with process water approaching 100 °C (212 °F) and a chill source about 2 °C (36 °F), a full-size device would produce about 600 m³ of water per day. Salt concentration in the wastewater would only be about 10% above the level of the original water, thus, from, say, 35,000 to about 38,000 parts per million, well within the ability of osmoregulators to adjust.

See also[]

• Geothermal power

External links[]

• European Renewable Energy Council - Geothermal Desalination
• ScienceDirect - Heat Transfer and Evaporation in Geothermal Desalination Units

References[]