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US 6,203,709 B1Granted
Iron (III)-doped calcium alginate gel sorbents for sorption of arsenate and selenite
AssigneeCalifornia Institute of Technology
InventorsJoon H. Min, Janet G. Hering
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Abstract
Systems and methods for removing oxyanionic contaminants, such as arsenate (As(V)) and selenite (Se(IV)), from polluted water. The system utilizes calcium alginate which has been doped with ferric iron. The system is operated as either a batch-type or continuous feed purifier. A dehydrator is included for drying spent absorbent beads to form a dry disposable solid waste product.
Claims8
A method for removing oxyanionic pollutants from polluted water, said method comprising the steps of:
- contacting polluted water which comprises oxyanionic pollutants at a polluting concentration with a sufficient amount of a sorption media for a sufficient time to substantially reduce the amount of oxyanionic pollutants in said polluted water, said sorption media comprising calcium alginate which is doped with ferric iron, wherein the amount of ferric iron present in said sorption media is between about 0.5 percent and about 4 percent by weight of the total wet weight of said sorption media;
- and
- separating said water with reduced concentration of oxyanionic pollutants from said sorption media.
Dependencies are inferred from the claim text.