Device and process for thickening and conveying waste water...

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 11/12 (2006.01) B04B 1/20 (2006.01) C02F 1/38 (2006.01) C02F 3/00 (2006.01) C02F 3/12 (2006.01) C02F 3/28 (2006.01) C02F 3/30 (2006.01) C02F 11/00 (2006.01) C02F 11/04 (2006.01)

Patent

CA 2211721

A method is suggested for minimizing biological sludge in which biologically formed sludges are broken by disintegration wihtin the scope of a biological sludge treatment. The disintegrated sludge is subjected to a phase separation -- preferably a flotation - before it is fed into the biological sludge reactor, so that the treatment volume of the subsequent sludge treatment devices can be reduced. During disintegration of the biologically formed sludge, the cell walls of the microorganisms that form the organic part of the sludge are destroyed mechanically. Up to now, these microorganisms have passed the biological sludge treatment largely undamaged and form the high organic part of dry substance of up to 50% of the mass of solid substance. The broken cell components are mineralized to biogas by organisms of the biological sludge treatment, preferably under anaerobic conditions. The dry sustance of the sludge is reduced to the mineral fractions, the water binding property is reduced, whereby the outflow of free water is promoted and, thus, the sludge volume to be disposed is drastically reduced.

L'invention concerne un dispositif et un procédé permettant d'épaissir et d'acheminer de la vase d'eaux d'égout, notamment avec une centrifugeuse. A cet effet, cette centrifugeuse comporte au moins un dispositif de lyse destiné à rompre les cellules des organismes contenus dans la vase des eaux usées. Le dispositif de lyse du dispositif réalisé selon l'invention peut par exemple se présenter sous forme de broyeur par friction (100; 200) avec des disques broyeurs (161, 162) ou avec un cône broyeur, sous forme de râpe profilée, de presse à cylindres, de tambour de tamisage, de mécanisme de coupe comportant des rangées d'éléments coupants rotatifs ou sous forme de broyeur à tiges muni de rangées de tiges rotatives. Le dispositif réalisé selon l'invention est apte à lyser les cellules qui apparaissent dans la vase d'eaux d'égout, notamment les cellules de bactéries et de protozoaires, de manière à ce que le contenu de leurs cellules se déverse dans le milieu environnant qui sert alors de réactif de simulation pour les bactéries qui subsistent dans la vase, ce qui permet d'une part de réduire de manière drastique le volume global de vase, et d'autre part d'augmenter considérablement la production de biogaz.

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