Investigation of the Effect of Feed Chemistry Control by In-Situ Electrodes on Degradation in SCWO Environments

摘要

There is a need both to destroy hazardous military and civilian waste and to identify safe and efficient alternative technologies. One effective process for the destruction of such waste is supercritical water oxidation (SCWO); however, materials degradation issues are one of the central challenges to this technology. It became apparent a number of years ago that maintaining a region thermodynamically favorable to alloy stability through feed stream modification could reduce degradation due to corrosion. However, a need for feedback from in-situ potential and pH electrodes was also recognized. This collaboration covered both the evaluation of corrosion phenomena in SCWO systems as well as the development of high temperature high pressure potential and pH electrodes for use in SCWO systems. Ultimately, the efficacy of feed chemistry control for SCWO systems was demonstrated during the project.