WIPO logo
Mobile | Deutsch | Español | Français | 日本語 | 한국어 | Português | Русский | 中文 | العربية |
PATENTSCOPE

Search International and National Patent Collections
World Intellectual Property Organization
Search
 
Browse
 
Translate
 
Options
 
News
 
Login
 
Help
 
maximize
Machine translation
1. (WO1997037008) MEANS AND PROCESS FOR NITRATE REMOVAL
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

CLAIMS

1. Permeable polymeric beads containing entrapped fermentative and denitrifying bacteria, and a carbon source serving as nutrient.

2. Beads according to claim 1 , where the products of one of the bacteria serve as nutritive source of the other bacteria.

3. Beads according to claim 1 or 2, where one of the bacteria is of the
Bacillus pumilus type, the other of the Pseudomonas stutzeri type.

4. Beads according to any of claims 1 to 3, where the polymeric substance is chitosan or an alginate or another gelling agent which undergoes setting at room temperature.

5. Beads according to any of claims 1 to 4, where the organic carbon source entrapped in the beads is cellulose, starch or another suitable high M.W. carbohydrate.

6. Permeable polymeric beads according to any of claims 1 to 5, where the average size is from about 1 to about 5 mm diameter.

7. Polymeric denitrifying polymeric beads containing a combination of two different bacteria, and a high moleculor weight carbon source obtained by freeze-drying.

8. A process for the denitrification of an aqueous medium containing an excess of nitrates or nitrite, which comprises contacting such a medium with polymeric beads as claimed in any of claims 1 to 7.

9. A process according to claim 8, where the aqueous medium is denitrified by passage through a bed of such beads.

10. A process according to claims 8 or 9, where the denitrification is of aquarium water.

11. A process according to claims 8 or 9, where the denitrified aqueous medium is waste water containing an excess of nitrate.

12. A process according to claims 8 or 9, where the aqueous medium is any medium containing an excess of nitrate or nitrite.