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Reaction of hydrogen sulfide with oxygen in the presence of sulfite

Description: Commonly, abatement of hydrogen sulfide emission from a geothermal powerplant requires that hydrogen sulfide dissolved in the cooling water be eliminated by chemical reaction. Oxidation by atmospheric oxygen is the preferred reaction, but requires a suitable catalyst. Nickel is the most potent and thereby cheapest catalyst for this purpose. One mg/L nickel in the cooling water would allow 99% removal of hydrogen sulfide to be attained. A major drawback of catalytic air oxidation is that colloid… more
Date: January 14, 1983
Creator: Weres, O. & Tsao, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fluid composition in the tube sheet crevices of a nuclear steam generator

Description: A useful understanding has been gained of the conditions needed for a crevice liquid to exist and what determines how alkaline this liquid will be. We believe that corrosive agents other than hydroxides, silica and organic salts must play a role in crevice corrosion. The presence of organic anions and silica in the condensate argues against a strongly alkaline crevice environment. In many cases, there may be insufficient caustic in the crevice fluid to account for the corrosion observed, and an… more
Date: October 1, 1985
Creator: Weres, O. & Tsao, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Kinetics of silica polymerization

Description: The polymerization of silicic acid in geothermal brine-like aqueous solutions to produce amorphous silica in colloidal form has been studied experimentally and theoretically. A large amount of high quality experimental data has been generated over the temperature rang 23 to 100{sup 0}C. Wide ranges of dissolved silica concentration, pH, and sodium chloride concentration were covered. The catalytic effects of fluoride and the reaction inhibiting effects of aluminum and boron were studied also. T… more
Date: May 1, 1980
Creator: Weres, O.; Yee, A. & Tsao, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Chemistry of silica in Cerro Prieto brines

Description: The precipitation of amorphous silica from synthetic geothermal brines which resemble the flashed brine at Cerro Prieto has been studied. It was found that part of the dissolved silica quickly polymerizes to form suspended colloidal silica. The colloidal silica flocculates and settles slowly at unmodified brine pH values near 7.35. Raising the pH of the brine to about 7.8 by adding base and stirring for a few minutes causes rapid and complete flocculation and settling. These results have been c… more
Date: April 1, 1980
Creator: Weres, O.; Tsao, L. & Iglesias, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Kinetic equations and type curves for predicting the precipitation of amorphous silica from geothermal brines

Description: The kinetics of amorphous silica precipitation from aqueous solution up to 100/sup 0/C and containing up to 1M NaCl were studied experimentally. Empirical equations for the rate of molecular deposition on surfaces as a function of temperature, dissolved silica concentration, pH and salinity are presented. Empirical type curves which depict the decrease in dissolved silica concentration through homogeneous nucleation of colloidal silica are also presented. Two practical examples related to geoth… more
Date: August 1, 1978
Creator: Weres, O.; Yee, A.W. & Tsao, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Reactions of cresol in hot aqueous borate solutions

Description: Phenol and methylphenol (cresol) are constituents of certain waste streams being considered for underground injection. We studied reactions of these compounds in solutions with other constituents of the waste streams and suspended clay at concentrations and temperatures higher than expected in natural situations, i.e. at 200{degrees}C and 250{degrees}C. Under these conditions, the predominant reaction was the demethylation of cresol to form phenol. This reaction was catalyzed strongly by clay. … more
Date: April 1, 1992
Creator: Tsao, L. & Weres, O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Theoretical and experimental evaluation of waste transport in selected rocks: 1977 annual report of LBL Contract No. 45901AK. Waste Isolation Safety Assessment Program: collection and generation of transport data

Description: During fiscal year 1977, the following subtasks were performed. (1) Thermodynamic data were tabulated for those aqueous complexes and solid phases of plutonium, neptunium, americium, and curium likely to form in the environment. (2) Eh-pH diagrams were computed and drafted for plutonium, neptunium, americium and curium at 25/sup 0/C and one atmosphere. (3) The literature on distribution coefficients of plutonium, neptunium, americium, and curium was reviewed. (4) Preliminary considerations were… more
Date: September 1, 1977
Creator: Apps, J. A.; Benson, L. V.; Lucas, J.; Mathur, A. K. & Tsao, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Hydrological and geochemical investigations of selenium behavior at Kesterson Reservoir

Description: From 1985 to the present we have studied the behavior of selenium in various habitats and environments at Kesterson reservoir, shifting emphasis as remedial actions altered the physical setting. Investigations have evaluated the efficacy of several remedial alternatives, from innovative techniques relying on the complex geochemical behavior of selenium alternatives, from innovative techniques relying on the complex geochemical behavior of selenium in aquatic environments to conventional excavat… more
Date: October 1, 1990
Creator: Benson, S. M.; Tokunaga, T. K.; Zawislanski, P.; Yee, A. W.; Daggett, J. S.; Oldfather, J. M. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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