Treatment of surfaces to stabilize heavy metals
AssigneeMt2, LLC
InventorsJames Barthel, Mark A. Peters
Life of this patent
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Abstract
A reactive coating composition and method for treating a surface including heavy metals by applying the reactive coating composition to the surface. The surface can be, for example, a paint layer containing heavy metals. The reactive coating composition includes a stabilizing agent to stabilize the heavy metal and a permeability enhancing agent to increase the permeability of the paint layer, facilitating the reaction of the heavy metal with the stabilizing agent. The structure including the treated paint layer can be left in place or can be disposed in a non-hazardous landfill.
Claims69
A reactive coating composition for the stabilization of a heavy metal contained in a paint layer on a surface, said coating composition comprising:
- a) at least about 3 weight percent of a heavy metal stabilizing agent;
- b) at least about 1 weight percent of a permeability enhancing agent adapted to increase the permeability of the heavy metal stabilizing agent into the paint layer;
- and
- c) the balance comprising a vehicle including at least a binder, wherein said coating composition adheres to said paint layer and forms a complex heavy metal compound having reduced leachability.
A reactive coating composition for the stabilization of a heavy metal contained in a paint layer on a surface, said coating composition comprising:
- a) from about 5 weight percent to about 60 weight percent of a heavy metal stabilizing phosphate compound;
- b) from about 5 weight percent to about 25 weight percent of a permeability enhancing agent comprising N-Methyl-2-Pyrrolidone;
- and
- c) the balance comprising a vehicle including at least a binder, wherein said coating composition adheres to said paint layer and forms a complex heavy metal compound having reduced leachability.
A method for making a reactive coating composition adapted to react with a heavy metal to form a complex heavy metal compound with reduced leachability, comprising the steps of:
- a) providing a water-based paint composition;
- b) adding at least about 3 weight percent of a heavy metal stabilizing agent to said water-based paint composition;
- and
- c) adding at least about 1 weight percent of a permeability enhancing agent to said water-based paint composition.
A method for the stabilization of a heavy metal contained in a paint layer, comprising the steps of:
- a) providing a reactive coating composition comprising a heavy metal stabilizing agent, a permeability enhancing agent and a binder;
- b) applying said reactive coating composition to a paint layer on a structure;
- and
- c) leaving said reactive coating composition on said structure for a period of time sufficient to stabilize at least a portion of heavy metals contained in said paint layer.
A method for the treatment and disposal of a structure having a heavy metal containing paint layer on the structure, the method comprising the steps of:
- a) applying a reactive coating composition to said paint layer, said reactive coating composition comprising:
- i) a heavy metal stabilizing agent, and
- ii) a permeability enhancing agent adapted to increase the permeability of said heavy metal stabilizing agent into said paint layer;
- b) leaving said reactive coating composition on said paint layer for a period of time sufficient to stabilize at least a portion of heavy metals contained in said paint layer and to enable said reactive coating composition to dry and form a treated structure comprising a treated paint layer and a reactive coating layer;
- and
- c) disposing said treated structure comprising said treated paint layer in a landfill, wherein the leachability of heavy metals contained in said treated paint layer is reduced.
A method for the treatment of a structure having heavy metals on a surface of the structure, comprising the steps of:
- a) applying a reactive coating composition to said surface, said reactive coating composition comprising:
- i) a heavy metal stabilizing agent;
- and
- ii) a vehicle including a binder;
- and
- b) leaving said reactive coating composition on said surface for a period of time sufficient to stabilize at least a portion of heavy metals contained on said surface and to enable said reactive coating composition to dry and form a treated structure wherein the leachability of heavy metals is reduced.
Dependencies are inferred from the claim text.