Landfill material
AssigneeUnion Oil Company of California
InventorDean A. Young
Life of this patent
Estimating the term…
Abstract
A method for treating arsenic-containing waste materials for disposal in landfill sites comprises admixing an arsenic waste, Portland cement, sand, one or more water-soluble manganese or alkaline earth metal salts, and water, thereby producing a slurry similar to wet concrete, which slurry, when cured, leaves a rock-like material containing entrapped arsenic. This material may be used for landfill without danger of ground or rain waters leaching arsenic therefrom.
Claims17
A process for treating an arsenic-containing waste to produce an arsenic-containing landfill material essentially completely impervious to the arsenic-leaching effects of ground or rain waters, which process comprises:
- (a) admixing said arsenic-containing waste with (1) sufficient of one or more additive components selected from the group consisting of those alkaline earth metal and manganese compounds soluble in water at 25.degree. C. to the extent of at least 100 grams per liter such that said one or more additive components are present in a total mole ratio to arsenic of between about 1 and 10, calculated as the total moles of alkaline earth and manganese metals in said one or more additive components to the total moles of arsenic in said arsenic-containing waste and (2) a setting agent comprising Portland cement and sand, said admixing being accomplished in the presence of sufficient water and with sufficient of said setting agent to produce a mixed material having the consistency of wet concrete;
- (b) curing the mixed material under conditions sufficient to cause solidification;
- and
- (c) recovering a rock-like aggregate essentially completely impervious to the leaching of arsenic therefrom by ground or rain waters.
A landfill material comprising a rock-like aggregate obtained by curing under conditions sufficient to cause solidification a mixture consisting essentially of an arsenic-containing waste, a setting agent comprising Portland cement and sand, water, and one or more additive components selected from the group consisting of those manganese and alkaline earth metal compounds soluble in water at 25.degree. C. to the extent of at least 100 grams per liter, said landfill material being substantially more impervious to the arsenic-leaching effects of ground or rain waters than if said one or more additive components had not been present in said mixture.
A process for treating an arsenic-containing waste to produce an arsenic-containing landfill material essentially impervious to the arsenic-leaching effects of ground or rain waters, which process comprises:
- (a) admixing said arsenic-containing waste with a setting agent comprising Portland cement and sand such that the resulting composition contains between about 0.1 and 25 wt.% of said arsenic-containing waste, between about 20 and 70 wt.% of Portland cement, and between about 35 and 85 wt.% of sand, and further admixing said resulting composition with (1) one or more additive components selected from the group consisting of those alkaline earth metal and manganese compounds soluble in water at 25.degree. C. to the extent of at least 100 grams per liter and (2) sufficient water to dissolve said one or more additive components and produce a mixed material having the consistency of wet concrete;
- (b) curing the mixed materials under conditions sufficient to cause solidification;
- and
- (c) recovering a rock-like aggregate substantially more impervious to the leaching effects of arsenic therefrom by ground or rain waters than if said one or more additive components had not been present.
A rock-like landfill material produced by curing under conditions sufficient to cause solidification a mixture comprising (1) an admixture comprising between about 0.1 and 25 wt.% of an arsenic-containing waste, between about 20 and 70 wt.% of Portland cement, and between about 35 and 85 wt.% of sand, (2) sufficient of one or more additive components selected from the group consisting of those manganese and alkaline earth metal compounds soluble in water at 25.degree. C. to the extent of at least 100 grams per liter such that said one or more additive components are present in a total mole ratio to arsenic of between about 1 and 10, calculated as the total moles of alkaline earth and manganese metals in said one or more additive components to the total moles of arsenic in said arsenic-containing waste, and (3) sufficient water to dissolve said one or more additive components and produce a mixed material having the consistency of wet concrete, said landfill material being essentially completely impervious to the arsenic-leaching effects of ground or rain waters.
Dependencies are inferred from the claim text.