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
In 2005 to 2009 testing was done in a sixth prototype of a device referred to as a delta t device, 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.
* Geothermal power