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PILOT TESTING OF SODIUM THIOSULFATE
Citation:
Chang, J. AND T. Brna. PILOT TESTING OF SODIUM THIOSULFATE. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-86/275 (NTIS PB87167706), 1986.
Description:
The article gives results of pilot plant tests to evaluate sodium thiosulfate as an oxidation inhibition additive in five lime/limestone slurry flue gas desulfurization processes. It was found that the oxidation rate of absorbed SO2 was reduced by more than 50% in the presence of 100-200 ppm of thiosulfate ion in the scrubbing slurry. Calcium sulfate dihydrate (gypsum) scaling was eliminated and the unsaturated (with respect to gypsum) operation mode was maintained by the addition of sodium thiosulfate. Other benefits of sodium thiosulfate addition observed at the pilot plant included improvement in solids dewatering properties for limestone processes and improvement in SO2 removal efficiency for magnesium-enhanced lime/limestone processes.