The invention relates to a process, by means of which waste material in landfills, preferably from old dumps in domestic refuse landfill sites which are no longer active, or from old dump areas of sites still operating, can be reprocessed in order to reduce the original extent of the landfill site at a later stage and hence to recover useful areas. After coarse materials have been sorted out, the material taken from the landfill is subjected to float fractionation in water basins, in which biodecomposition with production of a biomass also takes place. Combustible floating materials, excess biomass, combustible coarse materials and biogas obtained from biomass are burned to release useful energy. Ash and incombustible material, which is comminuted if necessary, require substantially smaller landfill areas for dumping.
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