NOVELTY - A process for treating vegetation waters of oil mills involves filtering of the vegetation waters for removal of the fixed residue; concentration of the vegetation waters thus treated to eliminate part of the water present; heating and evaporation of the vegetation waters thus treated; reforming on a catalytic-bed reformer of the vegetation waters; separation via condensation of the water from the current leaving the reformer; and possible heat recovery; obtaining at output a gaseous current constituted by hydrogen, CO2, methane, CO, and other compounds.    USE - For treating vegetation waters of oil mills to produce gaseous current rich in hydrogen, CO2, methane, CO, and other gases (claimed) for treating other potentially polluting biomasses such as wastewater from the foodstuff industry (e.g. cheese factories).    ADVANTAGE - The method avoids the cost of disposal of the vegetation waters and produces a current of gas that can be used for energy purposes. The process uses membrane reactors that are able to produce ultrapure hydrogen through reforming of the vegetation waters. The energy consumption of the process, which mostly affects the running costs, may be considerably abated or reduced to zero by envisaging appropriate heat recovery, using heat coming from combustion of the husks and from combustion of the gaseous current produced by the reformer and, finally, using electrical energy obtained from the use of the gases produced by the reformer. The process may be integrated with other processes for treating the vegetation waters that produce waste constituted by water with fair amounts of organic compounds.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for plant for treating vegetation waters of oil mills comprising station for filtering the vegetation waters for removal of the fixed residue; an apparatus for concentration of the vegetation waters, once filtered, in order to obtain an aqueous solution with concentrated organic fraction usable as supply current; device for heating and vaporizing the supply current; reactor with catalytic bed that carries out reactions of steam reforming or oxidative reforming together with the water-gas-shift reaction; heat exchanger for recovering the heat of the gaseous current leaving the catalytic-bed reactor; and condensation apparatus for separating the water from the gaseous current leaving the heat exchanger.    DESCRIPTION OF DRAWING(S) - The figure shows block diagram of the process of disposal of wastewaters from oil mills.