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SRTC investigated several options to remediate the contents of Tank 48H. Three options were examined: the Fenton reaction, Hydrolysis and Catalysis. Each option was investigated using a series of six reactions. These reactions were exploratory in nature; optimization is planned for a later date. Each experiment was conducted over a two-week period. The results of the experiments indicate that each process is a viable in-tank option, but there are limitations (discussed below) that must be addressed. For all three options, tetraphenylborate destruction (i.e., conversion of TPB into any other species) efficiencies proved higher at pH 7-8 than 11. However, parallel studies show that the corrosion rate for any in-tank option increases as pH decreases. TBP destruction efficiency (i.e., percent conversion of TPB into other species) at pH 11 for the Fenton reactions ranged between 22 per cent (600 mg/L TAML, 45 degrees C, 30 mL H2O2) to 68 per cent (100 mg/L TAML, 45 degrees C, 264 mL H 2O2). TBP destruction efficiency at pH 11, 45 degrees C for the hydrolysis reaction measured 84 per cent. TBP destruction efficiency at pH 11, 45 degrees C for the 1000 ppm Pd-catalysis reaction equaled 56 per cent. The TPB destruction efficiency was highest for hydrolysis, followed by catalysis, and finally the Fenton reactions. The catalysis and hydrolysis experiments included placement of corrosion coupons in the reaction vessel. Only a small quantity of surface loss occurred (less than10 mils per year)

Process Development for Destruction of Tetraphenylborate in SRS Tank 48H