Progress of Cryogenics and Isotopes Separation , ISSN: 1582-2575
2018, Volume 21, Issue 2
Pages 67-72

Remarks on the thermal properties of rocks and the treatment of geothermal waters

Abstract

The geothermal waters in our country are geothermal waters cantonized in sedimentary formations, characterized by low pressures. They contain mainly bicarbonates, sulphates, chlorides, hydrocarbons in the free and dissolved state. The geothermal waters are subject to a treatment process in order to be exploited, by which gas separation and eventually their valorization and reduction of the salt crust formation capacity are achieved. In most countries, geothermal waters are exploited in volcanic regions or seismic phenomena and are therefore rich in H₂S and SO₂.
For water from sedimentary formations, various techniques are used, among which the introduction of inhibitory substances to reduce deposits (sodium polyphosphate), modification of the pH index to obtain neutral waters (by the addition of HCl), ultrasonic treatment, magnetic flux treatment, etc.
Geopressured deposits are water tanks covered with waterproof coating, subject to high pressures. The water contained in these tanks has a low salinity and is saturated with natural gas. These systems have a wide spread and can be exploited for both thermal energy and hydraulic power engineering.

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