Formulation and preparation of Hanford Waste Treatment Plant direct feed low activity waste Effluent Management Facility core simulant

McCabe, Daniel J.; Nash, C. A.; Adamson, Duane J.

doi:10.2172/1256684

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…At the time condensate samples used for the basis for the simulant were generated, the simulant being fed to the DuraMelter-10 were based on actual wastes expected during the DFLAW operations. Preparation and analysis of the core LMOGC simulant by SRNL has been described elsewhere [7]. This work added arsenic, selenium, cyanide, and mercury to the composition in order to quantify their fate and disposition.…”

Section: Testing Basis and Objectivementioning

confidence: 99%

Preparation and evaporation of Hanford Waste treatment plant direct feed low activity waste effluent management facility simulant

Adamson

Nash

Howe

et al. 2017

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The Hanford Waste Treatment and Immobilization Plant (WTP) Low Activity Waste (LAW) vitrification facility will generate an aqueous condensate recycle stream (LAW Melter Off-Gas Condensate, LMOGC) from the off-gas system. The baseline plan for disposition of this stream during full WTP operations is to send it to the WTP Pretreatment Facility, where it will be blended with LAW, concentrated by evaporation, and recycled to the LAW vitrification facility. However, during the Direct Feed LAW (DFLAW) scenario, planned disposition of this stream involves concentrating the condensate in a new evaporator at the Effluent Management Facility (EMF) and returning it to the LAW melter.The LMOGC stream will contain components, e.g. halides and sulfates, that are volatile at melter temperatures, have limited solubility in glass waste forms, and present a material corrosion concern. Because this stream will recycle within WTP, these components are expected to accumulate in the LMOGC stream, exacerbating their impact on the number of LAW glass containers that must be produced. Diverting the stream reduces the halides and sulfates in the glass and is a key objective of this program. In order to determine the disposition path, it is key to experimentally determine the fate of contaminants. To do this, testing is needed to account for the buffering chemistry of the components, determine the achievable evaporation end point, identify insoluble solids that form, determine the formation and distribution of key regulatoryimpacting constituents, and generate an aqueous stream that can be used in testing of the subsequent immobilization step.This overall program examines the potential treatment and immobilization of the LMOGC stream to enable alternative disposal. The objective of this task was to (1) prepare a simulant of the LAW Melter Off-gas Condensate expected during DFLAW operations, (2) demonstrate evaporation in order to predict the final composition of the effluents from the EMF evaporator to aid in planning for their disposition, and (3) generate concentrated evaporator bottoms for use in immobilization testing. This phase of testing added more hazardous constituents to the core simulant formulation to examine their reactivity and fate during evaporation, and included antifoam in order to determine if organomercury species are formed. A future report will document the leaching properties of the hazardous constituents in the immobilized waste forms.The results indicate that the simulant can easily be concentrated via evaporation. During the pH adjustment step in simulant preparation, ammonium was quickly converted to ammonia, and most of the ammonia was stripped from the simulated waste and partitioned to the condensate. Additionally, after evaporating to the target concentration of 15 weight % total solids (~6.5X the feed concentration) and cooling the simulant, a trace amount of zinc precipitated out of solution and it was slightly cloudy. The reason for zinc precipitation is not known, but the cloudiness is attributed to the ...

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Section: Testing Basis and Objectivementioning

confidence: 99%

Preparation and evaporation of Hanford Waste treatment plant direct feed low activity waste effluent management facility simulant

Adamson

Nash

Howe

et al. 2017

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show abstract

“…At the time that the condensate samples were generated, the simulant melter feed to the DM-10 was similar to actual wastes that are expected during the Direct Feed LAW operations. Preparation and analysis of the simulant has been described elsewhere [5]. For this test, a vacuum evaporator system was assembled and is similar in construction to a prior system [6] since design details of the future EMF evaporator are not yet available.…”

Section: Testing Basis and Objectivementioning

confidence: 99%

“…Concentrate Analysis for Concentrated Simulant Samples .................................... 21 Figure 3-12. Analysis of Condensate ............................................................................................Figure[3][4][5][6][7][8][9][10][11][12][13]…”

mentioning

confidence: 99%

Evaporation Of Hanford Waste Treatment Plant Direct Feed Low Activity Waste Effluent Management Facility Core Simulant

Adamson

Nash

McClane

et al. 2016

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Effluent Management Facility Evaporator Bottoms: Waste Streams Formulation and Waste Form Qualification Testing

Saslow

Russell

et al. 2018

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Formulation and preparation of Hanford Waste Treatment Plant direct feed low activity waste Effluent Management Facility core simulant

Cited by 3 publications

References 5 publications

Preparation and evaporation of Hanford Waste treatment plant direct feed low activity waste effluent management facility simulant

Preparation and evaporation of Hanford Waste treatment plant direct feed low activity waste effluent management facility simulant

Evaporation Of Hanford Waste Treatment Plant Direct Feed Low Activity Waste Effluent Management Facility Core Simulant

Effluent Management Facility Evaporator Bottoms: Waste Streams Formulation and Waste Form Qualification Testing

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