Biological digestion of waste fluids with particle...

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 1/34 (2006.01) C02F 3/34 (2006.01) C02F 1/00 (2006.01)

Patent

CA 2477130

The present invention relates to a method for the aerobic digestion of a fluid waste material, notably an aqueous sewage, in which at least part of the waste material and/or of the digestion mixture is comminuted to reduce the median particle size of biomass and other solid particles in the digestion mixture to less than 10 micrometres, for example using destructive cavitation with a pressure drop of from 2 to 7.5 Bar. The comminution produces particles which are preferentially ingested by predator organisms in the digestion stage so that they graze on the bacteria and biomass particles and thus reduce the amount of biomass and suspended solids produced in the digestion stage. The invention also relates to apparatus for use in the method of the invention.

L'invention concerne un procédé de digestion anaérobie d'un matériau de rejet liquide, notamment d'eaux usées, dans lequel au moins une partie du rejet et/ou du mélange de digestion est fragmenté afin de réduire la taille des particules de biomasse et d'autres particules solides du mélange de digestion à une dimension inférieure à 10 microns, au moyen, par exemple, de cavitation destructive avec une perte de charge de 2 à 7,5 bars. La fragmentation produit des particules qui sont, de préférence, ingérées par des organismes prédateurs de l'étape de digestion de façon qu'ils se nourrissent de bactéries et de particules de biomasse et réduisent ainsi la quantité de biomasse et de solides en suspension dans l'étape de digestion. L'invention concerne aussi un appareil destiné à être utilisé dans ce procédé.

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