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The report presents results of field tests of two processes which show potential for use in oxidizing the sulfide contained in saturated sodium chloride ground water at Paradox Valley, Colorado; the first involving electrochemical oxidation, and the second involving aeration with catalyst. In the first phase of the test program, aqueous sulfide, present in Paradox brine at a concentration of about 80 mg/L, was oxidized with sodium hypochlorite produced from existing brine at the site using a commercially available seawater electrolytic cell. In a second phase of testing, statistically designed experiments were used to determine the effects of selected variables on the efficiency of a nickel-catalyzed aeration process for oxidizing sulfide in Paradox brine to elemental sulfur.