UNIQUE ACTIVE CAKE LAYER FILTRATION

The module is designed as submerged solution with an out-to-in filtration process. It allows a targeted formation of a cake layer on the ceramic flat sheet membrane, contrary to pressurized membrane filtration solutions in which a cake layer formation needs to be avoided.

Ceramic flat sheet membrane - CERAFILTEC - illustration pressurized filtrationCeramic flat sheet membrane - CERAFILTEC - illustration submerged filtration

SUBMERGED OUT-TO-IN FILTRATION

  • Filtration pressure on filtered water side
  • No compression of formed cake layer
  • High flux operation at very low pressure
  • Insensitive to high suspended solids loads – cake layer formation of up several mm/cm depending on selected module / ceramic plate distance
  • Long dead end filtration period
  • Low and short-duration backwash requirements
  • Very high recovery rate
  • Low power consumption
  • Easy to clean

PRESSURIZED IN-TO-OUT FILTRATION

  • Filtration pressure on feed side
  • Compression of formed cake layer (collected suspended solids)
  • Strong decline of membrane permeability – high pressure or low flux operation
  • Limited to suspended solids loads – risks of membrane blocking and clogging (additional pre-treatment recommended or frequent backwash)
  • High feed pressure can lead to passing of deformable contents, like TEP and decrease filtered water quality
  • High power consumption
  • High cleaning efforts

BENEFITS

  • Cake layer can be used as additional filter bed for enhanced removal of very small particles and colloidal fractions
  • Sorption processes inside the cake layer enable the selective removal of dissolved contents, like radium, uranium, arsenic or organics
  • Formed cake layer can function as protective coating to minimize biofouling or scaling
  • Improvement of filtered water quality can reduce design and process efforts of subsequent treatment steps
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