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...