Assessment of Technetium Leachability in Cement Stabilized Basin 43 Groundwater Brine

Jb, Duncan; Ga, Cooke; Ll, Lockrem

doi:10.2172/940786

Cited by 7 publications

(3 citation statements)

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“…A detailed campaign to study Tc getters was performed by Cooke et al (2006Cooke et al ( , 2008, Guthrie et al (2009), and Duncan et al (2009), wherein a Basin 43 waste brine simulant (which represents contaminated Hanford groundwater concentrated by evaporation; see Table A.5,) was stabilized with a variant Cast Stone recipe that contained only Portland cement and the BFS at a 2:1 ratio. Pertechnetate, 92.17 mg L -1 Tc(VII), was added to the Basin 43 brine simulant, which resulted in a final waste-form concentration of 0.58 to 0.71 ppm 99 Tc.…”

Section: A4 Tc-getter Studies In Saltstone/cast Stonementioning

confidence: 99%

Technetium and Iodine Getters to Improve Cast Stone Performance

Qafoku

Neeway

Lawter

et al. 2015

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Section: A4 Tc-getter Studies In Saltstone/cast Stonementioning

confidence: 99%

Technetium and Iodine Getters to Improve Cast Stone Performance

Qafoku

Neeway

Lawter

et al. 2015

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“…The cost of 2.15 SECAR 51 and the observation that its use leads to greater evolution of ammonia gas and waste form cracking late in the curing/hydration process were reasons that a switch to lime was made in the work conducted in 2006. A third waste simulant used by Cooke et al (2006cCooke et al ( , 2008 and Duncan et al (2009) was a salt concentrate from the evaporation of contaminated groundwater referred as Brine 43. The simulant composition is shown in Table 2.5.…”

Section: Range Of Wastes/compositions Testedmentioning

confidence: 99%

“…CH2M HILL Hanford Group, Inc., produced Cast Stone waste forms using essentially the same dry blend mix of cement, fly ash, and BFS with an LAW simulant at waste loadings (total dissolved salts) of 8.2 to 24.2% by weight (see Lockrem et al 2008). Duncan et al (2008) and Cooke et al (2009) achieved a waste loading (total weight of dry solids from the brine) of 28.9 wt% for a Basin 43 concentrated brine representative of a waste stream from the LERF.…”

Section: Waste Loadingmentioning

confidence: 99%

Data Package for Secondary Waste Form Down-Selection—Cast Stone

Serne¹,

Westsik²

2011

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Executive SummaryThe objective of the data packages being generated for four potential waste forms for solidification/ stabilization of Hanford liquid secondary waste streams is to identify, evaluate, and summarize the existing information. This Cast Stone data package includes information available in the open literature and from data obtained from testing currently underway at Pacific Northwest National Laboratory (PNNL). As used at Hanford, the term Cast Stone describes a "grout"-based waste form made predominantly with fly ash and blast furnace slag (BFS) with lesser amounts of Portland cement as the starting dry blend. At Savannah River, this waste form is called Saltstone. The blend of grout reagents in Saltstone has been constant (45 weight percent [wt%] Grade 100 slag cement, 45 wt% Class F fly ash, and 10-wt% Type I/II Portland cement) since the Saltstone Disposal Facility began production in the early 1990s. At Hanford, some cementitious variants to Cast Stone have also been investigated, in which either the fly ash or the BFS is absent or replaced with another material. In this data package, these Cast Stone variants are included for completeness in the review. However, almost all the current Cast Stone waste form testing performed at PNNL uses a dry blend consisting of 47-wt% blast furnace slag (Grade 100), 45-wt% fly ash (Class F), and 8-wt% Portland cement (Type I/II). The sources of the three dry blend ingredients used at Hanford and Savannah River differ and may have subtle impacts on the physical and chemical attributes of the subsequent waste forms. The compositions of the secondary waste simulants used for the PNNL Cast Stone studies also differ from the simulants and actual wastes solidified at Savannah River; although both are caustic-, saline-and sodium-dominated solutions. The Hanford secondary waste simulants anion composition contains much less nitrate/nitrite than the waste streams solidified at Savannah River.Available literature on Cast Stone and Saltstone was reviewed with an emphasis on determining how Cast Stone and related grout waste forms performed in relationship to various criteria that will be used to decide whether a specific type of waste form meets acceptance criteria for disposal in the Integrated Disposal Facility (IDF) at Hanford. The draft waste acceptance criteria include the following requirements or targets:• acceptable leachate concentrations (less than the Universal Treatment Standards in 40 CFR 268) for Resource Conservation and Recovery Act (RCRA) metals using the Toxicity Characteristic Leach Procedure (TCLP) leach test• low bleed water criteria (i.e., no bleed water is tolerated after 28 days of curing)• low leachability index (LI) values for sodium (LI>6), technetium-99 (target LI>9) and iodine-129 (target LI>11)• minimum compressive strength of 500 psi (3.45 MPa).Other attributes of the Cast Stone process were compared with additional criteria, such as:• worker and public safety concerns• cost effectiveness versus other candidate waste forms in regard to ...

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Characteristics of Cast Stone cementitious waste form for immobilization of secondary wastes from vitrification process

Chung

Valenta

et al. 2012

Journal of Nuclear Materials

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Assessment of Technetium Leachability in Cement Stabilized Basin 43 Groundwater Brine

Cited by 7 publications

References 0 publications

Technetium and Iodine Getters to Improve Cast Stone Performance

Technetium and Iodine Getters to Improve Cast Stone Performance

Data Package for Secondary Waste Form Down-Selection—Cast Stone

Characteristics of Cast Stone cementitious waste form for immobilization of secondary wastes from vitrification process

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