IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0231967
(2002-08-30)
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발명자
/ 주소 |
- Khandaker, Nadim R.
- Brady, Patrick V.
- Teter, David M.
- Krumhansl, James L.
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
5 인용 특허 :
7 |
초록
▼
A method for removing dissolved arsenic from an aqueous medium comprising adding lime to the aqueous medium, and adding one or more sources of divalent metal ions other than calcium and magnesium to the aqueous medium, whereby dissolved arsenic in the aqueous medium is reduced to a lower level than
A method for removing dissolved arsenic from an aqueous medium comprising adding lime to the aqueous medium, and adding one or more sources of divalent metal ions other than calcium and magnesium to the aqueous medium, whereby dissolved arsenic in the aqueous medium is reduced to a lower level than possible if only the step of adding lime were performed. Also a composition of matter for removing dissolved arsenic from an aqueous medium comprising lime and one or more sources of divalent copper and/or zinc metal ions.
대표청구항
▼
1. A method for removing dissolved arsenic from an aqueous medium, the method comprising the steps of: adding lime to the aqueous medium, wherein the step of adding lime increases the pH of the aqueous medium to at most approximately 10; and adding one or more sources of divalent metal ions other t
1. A method for removing dissolved arsenic from an aqueous medium, the method comprising the steps of: adding lime to the aqueous medium, wherein the step of adding lime increases the pH of the aqueous medium to at most approximately 10; and adding one or more sources of divalent metal ions other than calcium and magnesium to the aqueous medium wherein said metal ions comprise one or more sources of copper ions or zinc ions; wherein substantially no ferric ions are added to the aqueous medium; and whereby dissolved arsenic in the aqueous medium is reduced to a lower level than possible if only the step of adding lime were performed. 2. The method of claim 1 wherein the step of adding lime increases pH of the aqueous medium to at most approximately 9. 3. The method of claim 2 wherein the step of adding lime increases pH of the aqueous medium to at most approximately 8.7. 4. The method of claim 1 wherein substantially no further alteration of pH occurs after the adding steps. 5. The method of claim 1 wherein the steps of adding one or more sources of divalent metal ions comprises adding one or more sources of copper ions. 6. The method of claim 5 wherein the step of adding one or more sources of copper ions to provide a concentration in the aqueous medium of greater than or equal to approximately 1.0 mg/L. 7. The method of claim 6 wherein the step of adding one or more sources of copper ions to provide a concentration in the aqueous medium of at or between approximately 1.5 and 2.5 mg/L. 8. The method of claim 7 wherein the step of adding one or more sources of copper ions to provide a concentration in the aqueous medium of at or between approximately 1.5 and 2.0 mg/L. 9. The method of claim 1 wherein the step of adding one or more sources of divalent metal ions comprises adding one or more sources of zinc ions. 10. The method of claim 9 wherein the step of adding one or more sources of zinc ions to provide a concentration in the aqueous medium of greater than or equal to approximately 0.5 mg/L. 11. The method of claim 10 wherein the step of adding one or more sources of zinc ions to provide a concentration in the aqueous medium of at or between approximately 0.5 and 3.0 mg/L. 12. The method of claim 11 wherein the step of adding one or more sources of zinc ions to provide a concentration in the aqueous medium of at or between approximately 0.5 and 1.5 mg/L. 13. The method of claim 1 whereby dissolved arsenate in the aqueous medium is reduced to a lower level than possible if only the step of adding lime were performed. 14. The method of claim 1 additionally comprising the step of conducting the adding steps in an apparatus selected from the group consisting of surface water treatment plants, wastewater treatment plants, plants for treating pumped groundwater, groundwater in situ remediation systems, water filters, and water softeners. 15. The method of claim 1 wherein the step of adding one or more sources of divalent metal ions comprises adding one or more of the group consisting of copper sulfate (CuSO4, CuSO4.5H2), copper chloride (CuCl2, CuCl2.H2O), copper nitrate (Cu(NO3)2.6H2O), copper acetate, zinc sulfate (ZnSO4, ZnSO4.7H2), zinc chloride (ZnCl2), zinc nitrate (Zn(NO3)2.6H2O), and anhydrous zinc nitrate (Zn(NO3)2). 16. A method for removing dissolved arsenic from an aqueous medium, the method consisting essentially of the steps of: adding lime to the aqueous medium, wherein the step of adding lime increases the pH of the aqueous medium to at most approximately 10; and adding one or more sources of divalent metal ions other than calcium and magnesium to the aqueous medium wherein said metal ions comprise one or more sources of copper ions or zinc ions; whereby dissolved arsenic in the aqueous medium is reduced to a lower level than possible if only the step of adding lime were performed. 17. The method of claim 16 wherein the step of adding lime increases pH of the aqueous medium to at most approximately 9. 18. T he method of claim 17 wherein the step of adding lime increases pH of the aqueous medium to at most approximately 8.7. 19. The method of claim 16 wherein substantially no further alteration of pH occurs after the adding steps. 20. The method of claim 16 wherein the step of adding one or more sources of divalent metal ions comprises adding one or more sources of copper ions. 21. The method of claim 20 wherein the step of adding one or more sources of copper ions to provide a concentration in the aqueous medium of greater than or equal to approximately 1.0 mg/L. 22. The method of claim 21 wherein the step of adding one or more sources of copper ions to provide a concentration in the aqueous medium of at or between approximately 1.5 and 2.5 mg/L. 23. The method of claim 22 wherein the step of adding one or more sources of copper ions to provide a concentration in the aqueous medium of at or between approximately 1.5 and 2.0 mg/L. 24. The method of claim 16 wherein the step of adding one or more sources of divalent metal ions comprises adding one or more sources of zinc ions. 25. The method of claim 24 wherein the step of adding one or more sources of zinc ions to provide a concentration in the aqueous medium of greater than or equal to approximately 0.5 mg/L. 26. The method of claim 25 wherein the step of adding one or more sources of zinc ions to provide a concentration in the aqueous medium of at or between approximately 0.5 and 3.0 mg/L. 27. The method of claim 26 wherein the step of adding one or more sources of zinc ions to provide a concentration in the aqueous medium of at or between approximately 0.5 and 1.5 mg/L. 28. The method of claim 16 whereby dissolved arsenate in the aqueous medium is reduced to a lower level than possible if only the step of adding lime were performed. 29. The method of claim 16 wherein the adding steps are conducted in an apparatus selected from the group consisting of surface water treatment plants, wastewater treatment plants, plants for treating pumped groundwater, groundwater in situ remediation systems, water filters, and water softeners. 30. The method of claim 16 wherein the step of adding one or more sources of divalent metal ions comprises adding one or more of the group consisting of copper sulfate (CuSO4, CuSO4.5H2), copper chloride (CuCl2, CuCl2.H2O), copper nitrate (Cu(NO3)2.6H2O), copper acetate, zinc sulfate (ZnSO4, ZnSO4.7H2), zinc chloride (ZnCl2), zinc nitrate (Zn(NO3)2.6H2O), and anhydrous zinc nitrate (Zn(NO3)2.
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