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  5. Fixed cultures on thin supports: mechanisms involved

Article | REF: C5223 V2

Urban wastewater treatment - Extensive technologies and tertiary treatments

Author: Jean-Marc BERLAND

Publication date: August 10, 2024 | Lire en français

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    2. Fixed cultures on thin supports: mechanisms involved

    2.1 Filtration and oxidation

    Water purification techniques using cultures fixed on a fine granular support imply that the wastewater to be treated is progressively dispersed above various strata or beds of material, called massifs, which are arranged so as to operate independently of each other.

    • Two key mechanisms

      At the heart of this treatment system are two essential mechanisms for efficient elimination.

      • Surface filtration

        This mechanism involves a physical phenomenon whereby suspended solids present in the water are retained or stopped at the surface of the gravel pack. As these materials accumulate, they form a layer that captures...

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