Demonstration of Entrained Solids and Sr/TRU Removal Processes with Archived AN-107 Waste

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Archived AN-107 waste was used to evaluate entrained solids removal, Sr/TRU decontamination of supernatant, and Sr/TRU solids removal. Even though most of the entrained solids had been previously removed from the archived sample, the residual entrained solids rapidly fouled the filter element resulting in very poor filter performance. An attempt to run at higher pressure resulted in more fouling, and reduced filter performance. Filtration efforts to remove entrained solids were abandoned and the waste was treated for Sr/TRU removal with the entrained solids present. The new processing scheme for Sr/TRU removal involving precipitation by added strontium and permanganate worked well. ... continued below

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Medium: P; Size: 106 pages

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Hallen, RT; Brooks, KP & Jagoda, LK August 2, 2000.

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Description

Archived AN-107 waste was used to evaluate entrained solids removal, Sr/TRU decontamination of supernatant, and Sr/TRU solids removal. Even though most of the entrained solids had been previously removed from the archived sample, the residual entrained solids rapidly fouled the filter element resulting in very poor filter performance. An attempt to run at higher pressure resulted in more fouling, and reduced filter performance. Filtration efforts to remove entrained solids were abandoned and the waste was treated for Sr/TRU removal with the entrained solids present. The new processing scheme for Sr/TRU removal involving precipitation by added strontium and permanganate worked well. The decontamination factors for Sr and TRU components were significantly greater than the ILAW DF requirements for higher reagent concentrations of 1M hydroxide, 0.075M Sr, and 0.05M permanganate and lower reagent concentrations of 0.8M hydroxide, 0.05M Sr, and 0.03M permanganate. These results support the use of lower concentration of reagent additions in future tests. Optimization studies should be conducted to examine the reduction in added hydroxide from 1M to 0.5 M, reduction of Sr from 0.075M to 0.05M, and reduction in permanganate from 0.05M to 0.03M and the impact this reduction has on filtration performance with new samples from Tank AN-107. The combined entrained solids and Sr/TRU precipitate were successfully filtered in the single element, crossflow filtration unit. The filtrate flux was high, >0.1 gpm/ft{sup 2}, at the initial test conditions of 53 psi and 11.2ft/s for the treated archived AN-107 sample. The filter flux rate dropped significantly with time as testing progressed and appears to be a result of shearing the agglomerated solids and fouling of the filter element by the resulting fine particles. The relatively low clean water flux rates obtained at the end of the test also indicate filter fouling. Chemical cleaning was required to restore clean water flux rates to pre-test levels. The filter performance as a function of wt% solids could not be determined in this study because the treated waste volume was close to the minimum CUF volume and no dewatering could occur. Additional filtration tests need to be conducted to determine the filtrate flux as a function of wt% solids. Solids washing in the CUF also needs to be conducted to determine filtrate flux rate as a function of solids loading during washing.

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Medium: P; Size: 106 pages

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INIS; OSTI as DE00759182

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  • Other Information: PBD: 2 Aug 2000

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  • Report No.: PNWD-3033
  • Report No.: BNFL-RPT-026
  • Grant Number: AC06-76RL01830
  • DOI: 10.2172/759182 | External Link
  • Office of Scientific & Technical Information Report Number: 759182
  • Archival Resource Key: ark:/67531/metadc709771

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • August 2, 2000

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 6, 2016, 1:50 p.m.

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Hallen, RT; Brooks, KP & Jagoda, LK. Demonstration of Entrained Solids and Sr/TRU Removal Processes with Archived AN-107 Waste, report, August 2, 2000; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc709771/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.