Effects of closure cap and liner on contaminant release rates from grouted wastes

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This paper describes a groundwater modeling study of waste disposal concepts using grouted waste forms. The focus of the study is on the effects of clay caps and concrete vaults on contaminant migration. The authors modeled three waste disposal scenarios: (1) Grouted waste was solidified in an earthen trench and covered with soil, there was no vault and no cap; (2) grouted waste was solidified in an earthen trench, the entire waste disposal facility was then closed under a clay cap; (3) grouted waste was solidified in a concrete vault and protected by the same closure as in 2. Because ... continued below

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8 p.

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Yu, A.D.; Fowler, J.R. & Bignell, D.T. August 1, 1996.

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Description

This paper describes a groundwater modeling study of waste disposal concepts using grouted waste forms. The focus of the study is on the effects of clay caps and concrete vaults on contaminant migration. The authors modeled three waste disposal scenarios: (1) Grouted waste was solidified in an earthen trench and covered with soil, there was no vault and no cap; (2) grouted waste was solidified in an earthen trench, the entire waste disposal facility was then closed under a clay cap; (3) grouted waste was solidified in a concrete vault and protected by the same closure as in 2. Because of the huge contrast in hydraulic conductivities and highly non-linear multi-phase flow characteristics, these waste disposal concepts presented a difficult problem for numerical simulation. Advanced fluid flow and contaminant transport codes were used to solve the problem. Among the codes tested, ECLIPSE out-performed other codes in speed, accuracy (smaller material balance errors) and capability in handling sophisticated scenarios. The authors used nitrate as a tracer for the simulation. Nitrate does not absorb in the solid phase and does not decay. As a result, predicted release rate based on nitrate is conservative. They also assumed that the facility is intact for 10,000 years. In other words, properties of the materials used for this study do not change with time. Predicted peak flux for the no vault and no closure case was 5.8 {times} 10{sup {minus}4} per year at 12 years. If a clay cap was installed, predicted peak flux was 8.5 {times} 10{sup {minus}5} per year at 110 years. If the grout was disposed in a concrete vault and covered by a clay cap, predicted peak flux became 4.4 {times} 10{sup {minus}6} per year at 8,000 years. Both concrete liner and clay cap can reduce the rate of contaminant release to the water table and delay the peak time.

Physical Description

8 p.

Notes

INIS; OSTI as DE96012429

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  • Society of Computer Simulation (SCS) multiconference: high performance computing, New Orleans, LA (United States), 8-11 Apr 1996

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  • Other: DE96012429
  • Report No.: WSRC-MS--96-0042
  • Report No.: CONF-960482--9
  • Grant Number: AC09-89SR18035
  • Office of Scientific & Technical Information Report Number: 270697
  • Archival Resource Key: ark:/67531/metadc665311

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  • August 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • Feb. 9, 2016, 5:31 p.m.

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Yu, A.D.; Fowler, J.R. & Bignell, D.T. Effects of closure cap and liner on contaminant release rates from grouted wastes, article, August 1, 1996; Aiken, South Carolina. (digital.library.unt.edu/ark:/67531/metadc665311/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.