Remediation material and remediation process for sediments
AssigneeCommonwealth Scientific and Industrial Research Organisation
InventorGrant Brian Douglas
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Abstract
A material and method for removal of environmental oxyanions (and especially phosphates), the material comprising a substrate such as a clay modified with complexing elements selected from Group IIIB, Group IVB, and lanthanide elements (or a mixture of such elements). The resultant modified substrate can bind oxyanions and make them unavailable for utilisation in the environment; in the case of phosphates, by algae and the like. The method includes forming a capping of material at the sediment/water interface, applying the material in the form of pellets at the sediment/water interface, or injecting the pellets into the sediment.
Claims23
A method for remediating matter selected from sediments and effluent by removing phosphorus and oxyanion pollutants therefrom, the method including the step of contacting the matter with a substrate selected from one or more of an aluminosilicate clay and an aluminosilicate having a three dimensional framework structure with internal cavities, modified by cation exchange with an effective amount of complexing element(s) selected from Group IIIB, lanthanides, and Group IVB elements to remove said phosphorus and oxyanion pollutants.
A method for remediating matter selected from sediments and effluent by removing phosphorus and oxyanion pollutants therefrom, the method including the step of contacting the matter with a substrate selected from one or more of an aluminosilicate clay and an aluminosilicate having a three dimensional framework structure with internal cavities, modified by cation exchange with an effective amount of at least one complexing element selected from Group IIIB, lanthanides, and Group IVB elements, and including adding a soluble salt of the complexing element selected from group IIIB and Group IVB elements to remove said phosphorus and oxyanion pollutants.
A method for remediating matter selected from sediments and effluent by removing phosphorus and oxyanion pollutants therefrom, the method including the step of contacting the matter with a substrate selected from one or more of an aluminosilicate clay and an aluminosilicate having a three dimensional framework structure with internal cavities, modified by cation exchange with an effective amount of at least one complexing element selected from Group IIIB, lanthanides, and Group IVB elements, to remove said phosphorus and oxyanion pollutants, and wherein the substrate has a cation exchange capacity (CEC) of greater than about 30 milliequivalents per 100 grams (Meq/100 g).
Dependencies are inferred from the claim text.