HUBER Active Carbon Filter CONTIFLOW® GAK

Quaternary Treatment for the Removal of Micropollutants

The HUBER Active Carbon Filter CONTIFLOW® GAK removes micropollutants from the wastewater flow. The system uses granulated active carbon and is installed downstream of the secondary clarifier. An important advantage of the HUBER Active Carbon Filter CONTIFLOW® GAC is that it has no influence on existing process-engineering systems on the sewage treatment plant and can be optimised further by adding a sandfilter or an upstream ozonisation plant.

The HUBER Active Carbon Filter CONTIFLOW® GAK is a deep-bed type upflow filter. The system is highly efficient as no shutdowns for backwash cycles are necessary for the active carbon washing process.

As the influent flows from the bottom upward through the active carbon bed, the solid particles contained within the influent are retained in the filter layer and micropollutants are adsorbed on the large inner surface of the active carbon. The decisive factor for the second process is the residence time of the inflow in the active carbon bed.

The clear filtrate exits over a weir at the top of the filter. The active carbon bed, along with the accumulated solids, is drawn downward to the trough bottom into the airlift pipe, which is located in the centre of the filter. The airlift transports the mix upwards to the active carbon washer. Inside the washer, the solids are separated from the active carbon with a small portion of the filtrate flow. The active carbon is free of solids but still contaminated with micropollutants when it falls through to the filter bed so that an internal active carbon cycle is created.  As the filter operation continues more and more micropollutants are adsorbed on the inner surface of the carbon.



  • Procédé simple, maintenance aisée
    > Des procédés complexes et contraignants
  • Fonctionnement fiable et haut rendement
    > Des conceptions complexes coûteuses en termes de maintenance et de faible rendement effectif
  • Une seule pièce d’usure
    > Arrêts de maintenance liés au débouchage des buses et des bondes de fond
  • Pas d’arrêt pour les cycles de lavage
    > Arrêt de la filière à chaque cycle de lavage
  • Performance constante
    > Performances très variables à cause du cycle de lavage
  • Gestion aisée de l’eau de lavage grâce à un débit de lavage faible et constant
    > Système complexe nécessitant des bassins et des pompes pour gérer de forts débits de lavage instantanés
  • Perte de charge faible et constante
    > Perte de charge élevée et très variable


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