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Chemical behaviour of geothermal silica after precipitation from geothermal fluids with inorganic flocculating agents at the Hawaii Geothermal Project Well-A (HGP-A)

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Title: Chemical behaviour of geothermal silica after precipitation from geothermal fluids with inorganic flocculating agents at the Hawaii Geothermal Project Well-A (HGP-A)
Authors: De Carlo, EH
Keywords: scaling
process chemistry
silica
chemistry
Puna
show 3 moreHGP-A
Kilauea
East Rift Zone

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Issue Date: 01 Jan 1987
Publisher: University of Hawaii at Manoa
Citation: De Carlo EH. 1987. Chemical Behaviour of Geothermal Silica after Precipitation from Geothermal Fluids with Inorganic Flocculating Agents at the Hawaii Geothermal Project Well-A (HGP-A). Honolulu (HI): University of Hawaii at Manoa.
Abstract: The report summarizes the results of experiments dealing with the problem of removal of waste-silica from spent fluids at the experimental power generating facility in the Puna District of the island of Hawaii. Geothermal discharges from HGP-A represent a mixture of meteoric and seawaters which has reacted at depth with basalts from the Kilauea East Rift Zone under high pressure and temperature. After separation of the steam phase of the geothermal fluid from the liquid phase and a final flashing stage to 100 degrees Celsius and atmospheric pressure, the concentration of the silica increases to approximately 1100 mg/L. This concentration represents five to six times the solubility of amorphous silica in this temperature range. We have evaluated and successfully developed bench scale techniques utilizing adsorptive bubble flotation for the removal of colloidal silica from the spent brine discharge in the temperature range of 60 to 90 degrees C. The methods employed resulted in recovery of up to 90% of the silica present above its amorphous solubility in the experimental temperature range studied.
Description: Report Number: DOE/SF/15799-T11; OSTI ID: 6784371; Legacy ID: DE87003991
Sponsor: DOE Contract Number FG03-85SF15799
Pages/Duration: 82 pages
URI/DOI: http://hdl.handle.net/10125/21828
Appears in Collections:The Geothermal Collection



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