METHOD FOR TREATING GEOTHERMAL WATER

摘要

PROBLEM TO BE SOLVED: To enhance the removal efficiency of silica and arsenic by easily removing the silica and arsenic from geothermal water even if the geothermal water is in a high temperature state and inhibiting a removal cost.

SOLUTION: The geothermal water taken out from underground and containing the silica and arsenic is brought into contact with an adsorbent containing hydroxyapatite the structure formula of which is Ca10(PO4)6(OH)2to adsorb the silica and arsenic in the geothermal water. The adsorbent is constituted by a powdery, granular or bulky porous body containing 90 mass% or more of hydroxyapatite. When the geothermal water is brought into contact with the adsorbent, the contact is carried out under a hydrothermal condition that a temperature is 100°C to 300°C and a pressure is 0.2-30 MPa.

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