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DEEP VADOSE ZONE TREATABILITY TEST OF URANIUM REACTIVE GAS SEQUESTRATION FOR THE HANFORD CENTRAL PLATEAU
Truex, M.J., J.E. Szecsody, C.E. Strickland, D.A. St. John, M.M. Snyder, C.T. Resch, et al.
PNNL-27773, 249 pp, 2018

A uranium reactive gas sequestration (URGS) test was conducted as a potential remedy to decrease the mobility of uranium in the vadose zone as a mechanism to protect groundwater at DOE's Hanford facility. The URGS technology is based on a series of geochemical reactions that occur when ammonia vapor is injected into uranium-contaminated vadose zone sediments. Lab tests with site sediments were conducted concurrently with the field test design and construction to evaluate treatment effectiveness. When lab results demonstrated that interferences affected the ammonia treatment, the field test was not conducted. This treatability test report compiles the technology information gained from lab testing during technology development and describes the field injection and monitoring equipment design and associated design calculations. Collectively, this information will enable evaluation of the ammonia gas technology for applicability at other sites. http://www.pnnl.gov/main/publications/external/technical_reports/PNNL-27773.pdf



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