OCR Text |
Show The base test conditions established for these tests consisted of the initial melt composition of 95 wt% Na:zC03-S wt% NaCl, a melt temperature of 90QoC, a superficial gas velocity through the salt vessel of 30.5 em/s, and stoichiometry of 25% excess air. NaCl was added to approximate the steady-state concentration of chloride in the melt due to oxidation of PVC. A teat of the simulated intermedjate level waste slurry containing 4M NaOH and 4M NaNO] was successfully performed with a water-to-methanol weight ratio of 1.5. The concentration of CO and hydrocarbons in the off-gas were less then 200 ppm (the limit of detectability). The NO and N02 conccntrations were 6400 ppm and 2000 ppm, respectively. The particulste loading was 0.98 g/m3 (0.43 grain/scf). These particulates consisted mainly of sodium chloride. . The off-gas from oxidation of the simulated intermediate level waste was scrubbed with benzene which was then 3QaJyzed for organic phosphorus. This was done to determine the degree of destruction of TBP in the feed. The phosphorous concentration in the off-gas was 0.023 mwm3. This corresponds to 99.99% destruction of the TBP in the feed. The volume reduction factor for disposal of the sjmulated intermediate level waste was calculated to be S.6. This is the ratio of the volume of the initial intermedjate level waste to the final salt product. The composition of the final salt product is approximately 3-5 wt% NaCl, 5-10 wt% NaOH, and 85-92 wt% NalCOl . Presently there are a number of possibilities for using the MSO process to treat hazardous and mixed wastes. A number of waste streams applicabJe to MSO are currently being generated and stored at Oak Ridge facilitjes. These waste streams are basically organic liquids with high concentrations of uranium and beryllium and are not suitable for any other commercially available process. References 1. D. Steiman, A. E. Stewart, S. 1. Yosim, and R. L. Gay, "Treatment of Mixed Waste by the Molten Salt Oxidation Proc~SJ," presented at the 1992 Incineration Conference, Albuquerque, New Mexico (May 11-15, 1992). 2. R. L. Gay, "Molten SaIL Oxidation of Hazardous and Mixed WasteJ " presented at the 1992 Pacific Basin Conference on Hazardous Waste, B~ngkok, Thailand (April 6-10, 1992). |