FIGURE 2–3 Process flow diagram of the AEA 12 kW demilitarization plant. SOURCE: Adapted from AEA (2000).

in the 12 kW unit was not performed. Once the DMMP had been premixed for 24 hours, it was discharged into a second vessel, from which it was continually mixed and metered into the anolyte vessel.

Energetics Tests

Demo II testing of the SILVER II™ 12 kW system with energetics had the following objectives (DoD, 2001):

  • Validate the ability to achieve a DRE of 99.999 percent for tetrytol, Composition B, and M28 propellant.

  • Determine the impact of operations on materials of construction.

  • Demonstrate the operation and performance of key process components for future scale-up.

  • Demonstrate the ability/inability to recycle, reuse, or dispose of nitric acid.

  • Characterize gaseous, liquid, and solid process streams.

The tests on energetic material were conducted with premixed water slurries in the 12 kW unit. The average size of the energetics particles was 500 µm. The slurries were prepared in batches and kept well stirred in a storage vessel until they were pumped into the anolyte vessel for destruction. The feed rate was adjusted to maintain a minimum level of energetic material in the anolyte circuit at any time. The TOC in the anolyte vessel was monitored online to estimate the level of energetic in the anolyte vessel.

TEST RESULTS

The next sections summarize the results of the 2 kW and 12 kW tests and their relation to the stated objectives. These sections include discussions and comments from the committee on destruction rates, materials of construction, and gaseous, liquid, and solid process discharge. Other important committee observations germane to the operation and performance of key process components for future scale-up are also included.

Destruction and Removal Efficiency

In both the 2 kW and 12 kW systems, the overall instantaneous destruction rate was calculated from the volumetric flow rate and the measured composition of the anolyte offgas. Analysis of the anolyte off-gas by continuous emission monitors provided the composition (volume percent, equivalent to mole percent) of the gas. The volumetric flow, corrected for ambient temperature and pressure, provided the total molar flow rate.

The DRE (in percent) for a feed of agent or energetic was defined by AEA as follows:



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