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1. WO2016100903 - SYSTÈME ET PROCÉDÉ DE TRAITEMENT BIOLOGIQUE DE L'EAU AU MOYEN DE FER HYBRIDE ACTIVÉ

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A method for reducing the concentration of a contaminant in water, comprising contacting water comprising one or more contaminants with a zero-valent iron treatment system for a time sufficient to reduce the concentration of the contaminant in the water, wherein the treatment system comprises a combination of one or more denitrification microorganisms and a zero valent iron composite comprising

(a) a reactive solid comprising zero-valent iron and one or more iron oxide minerals in contact therewith, and

(b) ferrous iron.

2. The method of claim 1 further comprising activating the combination prior to contacting the combination with water.

3. The method of claim 2, wherein activating the combination comprises:

(a) adding a denitrification microorganism to the zero valent iron and ferrous iron;

(b) adding a nutrient for the microorganism to the combination; and

(c) incubating the combination in the presence of the nutrient for a predetermined time.

4. The method of claim 3, wherein adding the microorganism comprises adding an aqueous soil extract.

5. The method of any one of claims 1-4, wherein the microorganism is a bacterium.

6. The method of any one of claims 1-4, wherein the microorganism is an anoxic bacterium.

7. The method of any one of claims 1-4, wherein the microorganism is selected from the group consisting of Pseudomonas denitrificans, Pseudomonas aeruginosa, Pseudomonas perfectomarinus, Pseudomonas stutzeri, Pseudomonas aureofaciens, Pseudomonas mendocina, Pseudomonas fluorescens, Alcaligenes faecalis,

Thiobacillus denitrificans, Paracoccos denitrificans (Micrococcus denitrificans), Microvirgula aerodenitrificans, and Thaurea mechernichensis.

8. The method of any one of claims 1-4, wherein the reactive solid is prepared by treating zero-valent iron with a solution comprising a dissolved oxidant and ferrous iron to provide a reactive solid comprising zero-valent iron and one or more iron oxide minerals in contact therewith.

9. The method of claim 8, wherein the dissolved oxidant is nitrate.

10. The method of any one of claims 1-4, wherein the reactive solid comprises a plurality of particles.

11. The method of any one of claims 1-4, wherein the one or more iron oxide minerals of the reactive solid comprise magnetite.

12. The method of any one of claims 1-4, wherein the contaminant is selected from the group consisting of a metal compound, metal ion, metalloid, oxyanion, chlorinated organic compound, or a combination thereof.

13. The method of any one of claims 1-4, wherein the contaminant is selected from the group consisting of an arsenic compound, an aluminum compound, an antimony compound, a beryllium compound, a mercury compound, a selenium compound, a cobalt compound, a lead compound, a cadmium compound, a chromium compound, a silver compound, a zinc compound, a nickel compound, a molybdenum compound, a thallium compound, a vanadium compound, an arsenic ion, an aluminum ion, an antimony ion, a beryllium ion, a mercury ion, a selenium ion, a cobalt ion, a lead ion, a cadmium ion, a chromium ion, a silver ion, a zinc ion, a nickel ion, a molybdenum ion, a thallium ion, a vanadium ion, borates, nitrates, bromates, iodates, periodates, trichloroethylene, dissolved silica, and combinations thereof.

14. The method of any one of claims 1-4, wherein the contaminant is nitrate.

15. The method of any one of claims 1-4, wherein the contaminant is a selenium compound or a selenium ion.

16. The method of any one of claims 1-4, wherein the contaminant is a selenium species are selected from the group consisting of selenate (Se6+), selenite (Se4+), and selenide (Se"2) species, and mixtures thereof.

17. The method of any one of claims 1-4, wherein the contaminant is a selenium species are selected from the group consisting of a selenate, a selenite, selenocyanate, selenomethionine, and methylselenic acid.

18. The method of any one of claims 1-4, wherein the water comprising one or more contaminants is selected from flue gas desulfurization wastewater, industrial waste stream, oil refinery waste, tail water of a mining operation, stripped sour water, surface water, ground water, and an influent stream.

19. The method of any one of claims 1-4, wherein the water comprising one or more contaminants is flue gas desulfurization wastewater.

20. The method of any one of claims 1-4, wherein the water comprising one or more contaminants contacts the combination in a fluidized bed reactor.

21. The method of any one of claims 1-4, wherein the denitrification microorganism is attached to the zero valent iron.

22. A zero-valent iron treatment system for reducing the concentration of a contaminant in a fluid, the system comprising a combination of one or more denitrification microorganisms and a zero valent iron composite comprising

(a) a reactive solid comprising zero-valent iron and one or more iron oxide minerals in contact therewith, and

(b) ferrous iron.

23. The system of claim 22, wherein the reactive solid comprises a plurality of particles.

24. The system of claim 22, wherein the one or more iron oxide minerals of the reactive solid comprise magnetite.

25. The system of claim 22, wherein the iron oxide is an added iron oxide.

26. The system of any one of claims 22-25, wherein the reactive solid is prepared by treating zero-valent iron with a solution comprising a dissolved oxidant and ferrous iron to provide a reactive solid comprising zero-valent iron and one or more iron oxide minerals in contact therewith.

27. The system of claim 26, wherein the dissolved oxidant is nitrate.

28. The system of any one of claims 22-25, wherein the microorganism is a bacterium.

29. The system of any one of claims 22-25, wherein the microorganism is an anoxic bacterium.

30. The system of any one of claims 22-25, wherein the microorganism is selected from the group consisting of Pseudomonas denitrificans, Pseudomonas aeruginosa, Pseudomonas perfectomarinus, Pseudomonas stutzeri, Pseudomonas aureofaciens, Pseudomonas mendocina, Pseudomonas fluorescens, Alcaligenes faecalis, Thiobacillus denitrificans, Paracoccos denitrificans (Micrococcus denitrificans), Microvirgula aerodenitrificans, and Thaurea mechernichensis.

31. The system of any one of claims 22-25 further comprising a nutrient for the microorganism.

32. The system of claim 31, wherein the nutrient is a carbon-containing material, a phosphorus-containing material, a nitrogen-containing material, or a mixture thereof.

33. The system of any one of claims 22-25, wherein the system is contained within a fluidized bed reactor.

34. The system of any one of claims 22-25, wherein the denitrification microorganism is attached to the zero valent iron.