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The selection of the supports for biomass immobilisationis of great importance to obtain a stablebiofilm leading to a high nitrification efficiency. In thiswork five type of supports were assayed in external loopair-lift reactors: sand, limestone, basalt, pumice andporaver. The efficiencies of the supports were comparedand discussed in terms of their surface-properties: surfacefree energy of interaction, surface charge, porosity andshape. The results showed that materials leading to lowsurface free energies of interaction and with less negativesurface charges favour bacterial adhesion and the formationof stable biofilms. High porosities are also relevant forbacterial colonisation. However, irregular shaped particlesmay promote the erosion of attached biomass.Program Interreg - Project01/REG II/6/9

The importance of surface properties in the selection of supports for nitrification in airlift bioreactors