Hydrothermal processing of Hanford tank waste. Organic destruction technology development task annual report -- FY 1993

Abstract

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Thermal and combined thermal and radiolytic reactions involving nitrous oxide, hydrogen, nitrogen, and ammonia in contact with tank 241-SY-101 simulated waste

“…For an activation energy of 25 kcal/mole, approximately that reported for gas generation and related reactions (Delegard 1980;Ashby et al 1993;Meisel et al 1993;Orth et al 1993;Schmidt et al 1993Schmidt et al , 1994), a one-degree difference in temperature from 90°C would yield a 10% change in rate, a two-degree difference would yield a 20% change in rate, and a five-degree difference would yield a 60% change. The l-L reaction vessels were independently temperaturecontrolled and monitored throughout the tests to within f0.5"C, leading to a 5% error because of changes in thermal reaction rates and assuming a 25 kcal/mole activation energy.…”

In-tank processes for destruction of organic complexants and removal of selected radionuclides

“…Successful oxidation of organic complexants in these thermal studies was anticipated from the observed behavior of wastes in Tank 241-SY-101. Orth et al (1993) heated simulated Tank 241-SY-101 waste containing various organic complexants at 200 "C for various times. He observed rapid oxidation of HEDTA and glycolate at 200 "C. Orth (1993) also found that at 200 "C EDTA decomposed at a reasonable rate but that NTA did not.…”

“…Orth et al (1993) heated simulated Tank 241-SY-101 waste containing various organic complexants at 200 "C for various times. He observed rapid oxidation of HEDTA and glycolate at 200 "C. Orth (1993) also found that at 200 "C EDTA decomposed at a reasonable rate but that NTA did not. A temperature of 250 "C was required before NTA was oxidized at an appreciable rate.…”