Membrane degassing to reduce floating sludge

Also patented is our technique for the reduction of floating sludge in sewage plants, by which the oxygen requirement can be significantly reduced in comparison to pure-oxygen stripping.

Elementary nitrogen is created through de-nitrification during biological waste water purification. The oversaturation of the activated sludge with nitrogen can disturb the sedimentation; it produces floating sludge, which jeopardises the effluent quality of the sewage plant.

The N2 membrane contactor developed by us avoids this. It removes dispensable nitrogen from the activated sludge prior to entering the secondary sedimentation basin, and controls the material exchange at the direct contact of the two phases at the pore openings.

Membrane degassing with the N2 membrane contactor is especially appropriate for applications for which low operating costs are crucial to the choice of process.