A membrane unit and equipment for wastewater clarification...

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 11/12 (2006.01) C02F 1/00 (2006.01) C02F 3/12 (2006.01)

Patent

CA 2594799

Disclosed is an installation for treating sewage sludge, which comprises a sewage reception station (1) and in which a device (6) for separating sludge and filtrate is arranged. A membrane unit for treating waste water is provided with a membrane module (106) and a flushing box (105) that is located below said membrane module (106) and encompasses an air inlet via which purging air can be blown into the membrane module (106). The membrane module (106) comprises a waste water inlet and a sludge and permeate outlet. A sieve (108,110) is disposed between the flushing box (105) and the membrane module (106) in order to distribute the purging air to the entire membrane module (106) and/or at the waste water inlet into the membrane module (106) so as to retain large size suspended matter. The invention further relates to an installation for treating waste water by means of a membrane unit (103) and a method for operating such an installation. According to said method, operation of the permeate pump (123) is controlled in accordance with the water level in the receptacle, the permeate pump (123) being turned on or off and being operated at variable conveying quantities, and/or an additional permeate pump being activated.

L'invention concerne une installation de traitement de matières fécales comprenant une station de réception de matières fécales (1) et un dispositif (6) pour séparer la boue du filtrat. Une unité membrane de clarification des eaux d'égouts comporte un module membrane (106), sous lequel est monté un réservoir de chasse (105) doté d'une prise d'air par laquelle est insufflé de l'air de rinçage dans le module membrane (106), lequel est pourvu d'une arrivée des eaux usées et d'une évacuation de la boue et du perméat. Un tamis (108,110) est situé entre le réservoir de chasse (105) et le module membrane (106) pour répartir l'air de rinçage dans la totalité du module membrane (106) et/ou à l'arrivée des eaux usées dans le module membrane (106) pour retenir les matières en suspension les plus grosses. La présente invention porte également sur une installation de clarification des eaux usées comportant une unité membrane (103) et sur un procédé pour faire fonctionner une telle installation, selon lequel, en fonction du niveau d'eau dans le réservoir, la pompe perméat (123) est mise en et hors fonctionnement, elle fonctionne à différents débits de refoulement et/ou une pompe perméat supplémentaire est activée.

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