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US 5,512,702 AGranted
Method for in-situ immobilization of lead in contaminated soils, wastes, and sediments using solid calcium phosphate materials
AssigneeThe Ohio State University Research Foundation
InventorsJames A. Ryan, Terry J. Logan, Qi Y. Ma, Samuel J. Traina
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Abstract
Solid calcium phosphate materials are used for in-situ immobilization of lead contaminated soils, wastes, and sediments by mixing the solid calcium phosphate material with the lead contaminated material and leaving the mixture in place. The solid calcium phosphate material includes, for example, naturally occurring apatite, synthetic hydroxyapatite, dibasic calcium phosphate, or phosphate rock.
Claims17
A method for in-situ immobilization of lead contaminated solid materials comprising:
- determining the amount of lead in the lead contaminated solid material that needs to be immobilized;
- mixing the lead contaminated solid material with an amount of solid insoluble calcium phosphate material sufficient to react with the lead in the lead contaminated solid material;
- allowing a sufficient time period for a chemical reaction to take place wherein the lead in the lead contaminated solid material becomes immobilized and biologically unavailable;
- and
- leaving the mixture of any remaining lead contaminated solid material, any remaining solid insoluble calcium phosphate material, and the immobilized lead in place.
2 more elements
Dependencies are inferred from the claim text.