Clarification basin membrane

• US 7,080,828 B2
• Filed: 12/14/2002
• Issued: 07/25/2006
• Est. Priority Date: 12/22/2001
• Status: Expired due to Term

• Current Assignee: Phoenix Traffic Technology GmbH
• Original Assignee: Phoenix AG (Hamburg) (Continental AG)
• Inventors: Gomez-Kerber, Giancarlo, Muchorowski, Janusz, Krause, Karl-Heinz, Meier, Ernst-August, Merkmann, Gerhard
• Primary Examiner(s): BUSHEY, CHARLES S
• Application Number:
  US10/499,629
• Publication Number:
  US 20050045550A1
• Time in Patent Office: 1,319 Days
• Field of Search: 261/121.1, 261/122.1, 261/122.2, 261/124, 261/DIG.46, 261/DIG.70, 210/220
• US Class Current: 261/122.1
• 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 material, which is gas-permeable by means of a perforation (2), whereby with regard to permanent gas permeability of the polymer material, an inhibitor that is biologically active for waste water is added to the polymer material, which inhibitor is difficult to dissolve in water, and is distributed in the polymer material in essentially uniform manner,

wherein

the inhibitor is an inhibitor system, formed by a microorganism inhibitor and an algae inhibitor, whereby in reference to the total mass of the polymer material, the proportion of the inhibitor system is 0.1 to 5.0 wt.-%;

and that

the polymer material is a vulcanized rubber mixture, specifically on the basis of an ethylene-propylene-diene mixed polymerizate (EPDM), of nitrile rubber (NBR), or silicone rubber, each of them uncut, or on the basis of an EPDM/NBR blend, whereby 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.-%.

2. Settling basin membrane according to claim 1,

wherein the inhibitor, particularly as a microorganism inhibitor, is 2,4,4′

-trichloro-2′

-hydroxy-diphenyl ether.

3. 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.

4. 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.

5. Settling basin membrane according to claim 4,

wherein the carrier material is a molecular screen, preferably on the basis of a sodium-aluminum silicate.

6. Settling basin membrane according to claim 1,

wherein the polymer material is free of plasticizer.

7. Settling basin membrane according to claim 1,

wherein it is configured as a plate membrane.

8. Settling basin membrane according to claim 1,

wherein it is configured as a tube membrane.

9. Settling basin membrane according to claim 1,

wherein it is configured as a plate aerator membrane.