A plant for the abatement of pollutants in fumes and process water coming from a recycling unit of rubber residues, in particular EPDM (ethylene-propylene-diene polymer) vulcanized rubber, which comprises a treatment group of fumes composed of a suction hood (14) of fumes from an extruder (13) for the treatment of EPDM towards a washing tower (11, 11A) and a treatment and recovery group of process water consisting of a liquid ring vacuum pump (50) for feeding a mixture of water and gas leaving the extruder (13) towards a separator tank (51) in order to separate water and gas, wherein the washing tower of the scrubber-Venturi type envisages the provision of a Venturi water jet (15) fed by an atomizing pump (16) with water coming from a tank (17), a subgroup (28, 35) of the plant being connected to the tank (17), suitable for purifying the water with separation of the solid phase, and wherein the separator tank (51) is connected to a collection tank (53), in turn connected to a liquid ring vacuum pump (50) and to the tank (17), a dosage pump (18) of hydrogen peroxide also being associated with the tank (17), an accumulation tank (25) being envisaged, connected directly to the subgroup of the plant, suitable for purification, and also to the tank (17) associated with the washing tower, creating a continuous and closed water purification cycle.