Clarification basin membrane

• US 20050045550A1
• Filed: 12/14/2002
• Published: 03/03/2005
• Est. Priority Date: 12/22/2001
• Status: Active Grant

• Current Assignee: Phoenix Traffic Technology GmbH
• Original Assignee: Phoenix Traffic Technology GmbH
• Inventors: Krause, Karl-Heinz, Meier, Ernst-August, Merkmann, Gerhard, Gomez-Kerber, Giancarlo, Muchorowski, Janusz
• Granted Patent: US 7,080,828 B2
• Time in Patent Office: Days
• US Class Current: 210/321.600
• CPC Class Codes: C02F 3/201 Perforated, resilient plastic diffusers, e.g. membranes, sheets, foils, tubes, hoses
• CPC Class Codes: Y02W 10/10 Biological treatment of water, waste water, or sewage
• CPC Class Codes: Y10S 261/70 Sewage aerators; diffusers

Abstract

A clarification basin membrane made of a polymeric, in particular, elastomeric material, which is rendered gas-permeable by a perforation, whereby a permanent gas permeability is effected by mixing a wast water biologically active inhibitor with the polymeric material.

Claims

1. Settling basin membrane (1) made of polymer, particularly elastomer material, which is gas-permeable by means of a perforation (2), characterized in that an inhibitor that is biologically active for waste water is added to the polymer material, in order to achieve permanent gas-permeability.

2. Settling basin membrane according to claim 1, wherein the inhibitor is difficult to dissolve in water.

3. Settling basin membrane according to claim 1, wherein the inhibitor is an inhibitor system, formed of at least two inhibitor types.

4. Settling basin membrane according to claim 3, wherein the inhibitor system is formed by a microorganism inhibitor and an algae inhibitor.

5. Settling basin membrane according to claim 1, wherein the inhibitor, particularly as a microorganism inhibitor, is 2,4,4′

-trichloro-2′

-hydroxy-diphenyl ether.

6. Settling basin membrane according to claim 1, wherein the inhibitor, particularly as an algae inhibitor, is N′

-tert.butyl-N-cyclopropyl-6-(methylthio)-1,3,5-triazine-2,4-diamine.

7. Settling basin membrane according to claim 1, wherein a carrier material that is charged with the inhibitor or inhibitor system is mixed into the polymer material, specifically with the formation of a corresponding adduct.

8. Settling basin membrane according to claim 7, wherein the carrier material is a molecular screen, preferably on the basis of a sodium-aluminum silicate.

9. Settling basin membrane according to claim 1, wherein the inhibitor or the inhibitor system is distributed essentially uniformly in the polymer material.

10. Settling basin membrane according to claim 1, wherein with reference to the total mass of the polymer material, the proportion of the inhibitor or the inhibitor system is 0.1 to 5.0 wt.-%.

11. Settling basin membrane according to claim 1, wherein the polymer material is low in plasticizer, preferably free of plasticizer.

12. Settling basin membrane according to claim 1, wherein the polymer material is a vulcanized rubber mixture, specifically on the basis of EPDM, NBR, or silicone rubber, each of them uncut.

13. Settling basin membrane according to claim 1, wherein the polymer material is a vulcanized rubber mixture on the basis of an EPDM/NBR blend.

14. Settling basin membrane according to claim 1, wherein with reference to the total mass of the polymer material, the proportion of the polymer or rubber or blend component is 10 to 50 wt.-%.

15. Settling basin membrane according to claim 1, wherein it is configured as a plate membrane.

16. Settling basin membrane according to claim 1, wherein it is configured as a tube membrane.

17. Settling basin membrane according to claim 1, wherein it is configured as a plate aerator membrane.