Mercury removal at Idaho National Engineering and Environmental Laboratory's New Waste Calcining Facility

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Description

Technologies were investigated to determine viable processes for removing mercury from the calciner (NWCF) offgas system at the Idaho National Engineering and Environmental Laboratory. Technologies for gas phase and aqueous phase treatment were evaluated. The technologies determined are intended to meet EPA Maximum Achievable Control Technology (MACT) requirements under the Clean Air Act and Resource Conservation and Recovery Act (RCRA). Currently, mercury accumulation in the calciner off-gas scrubbing system is transferred to the tank farm. These transfers lead to accumulation in the liquid heels of the tanks. The principal objective for aqueous phase mercury removal is heel mercury reduction. The ... continued below

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276 Kilobytes pages

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Ashworth, S. C. February 27, 2000.

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Description

Technologies were investigated to determine viable processes for removing mercury from the calciner (NWCF) offgas system at the Idaho National Engineering and Environmental Laboratory. Technologies for gas phase and aqueous phase treatment were evaluated. The technologies determined are intended to meet EPA Maximum Achievable Control Technology (MACT) requirements under the Clean Air Act and Resource Conservation and Recovery Act (RCRA). Currently, mercury accumulation in the calciner off-gas scrubbing system is transferred to the tank farm. These transfers lead to accumulation in the liquid heels of the tanks. The principal objective for aqueous phase mercury removal is heel mercury reduction. The system presents a challenge to traditional methods because of the presence of nitrogen oxides in the gas phase and high nitric acid in the aqueous scrubbing solution. Many old and new technologies were evaluated including sorbents and absorption in the gas phase and ion exchange, membranes/sorption, galvanic methods, and UV reduction in the aqueous phase. Process modifications and feed pre-treatment were also evaluated. Various properties of mercury and its compounds were summarized and speciation was predicted based on thermodynamics. Three systems (process modification, NOxidizer combustor, and electrochemical aqueous phase treatment) and additional technology testing were recommended.

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276 Kilobytes pages

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INIS; OSTI as DE00758135

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  • Waste Management 2000, Tucson, AZ (US), 02/27/2000--03/02/2000

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  • Report No.: INEEL/CON-99-00997
  • Grant Number: AC07-99ID13727
  • Office of Scientific & Technical Information Report Number: 758135
  • Archival Resource Key: ark:/67531/metadc704067

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  • February 27, 2000

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 27, 2016, 3:25 p.m.

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Ashworth, S. C. Mercury removal at Idaho National Engineering and Environmental Laboratory's New Waste Calcining Facility, article, February 27, 2000; Idaho Falls, Idaho. (digital.library.unt.edu/ark:/67531/metadc704067/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.