Methods for immobilization of nitrate and nitrite in aqueous...

Details Methods for immobilization of nitrate and nitrite in aqueous... Methods for immobilization of nitrate and nitrite in aqueous...

2008-04-22

2008-04-22

Johnson, Edward M. (Department: 1754)

Hazardous or toxic waste destruction or containment

Processes for making harmful chemical substances harmless,...

Harmful chemical substances made harmless, or less harmful,...

Reexamination Certificate

active

10648893

ABSTRACT:
The present invention relates to a method of immobilizing aqueous waste, including low level nuclear waste, by converting the waste to a solid. Solidification is accomplished with the addition of a compound having the formula Me(II)O or Me(II)(OH)2in combination with compounds of the general formula Me(II)O.R2O3, R2O3, R(OH)3or ROOH, where Me is a cation selected from the group consisting of Ca, Ba, Sr, Mn, and Zn, and R is selected from the group consisting of Al, Fe and Cr. Exemplary compounds of the above formula include commercially available calcium aluminate cements, which when added to the waste in combination with a hydroxide of a divalent metal, bind the nitrate ions or nitrite ions in the waste and convert it to a solid.

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