NOVELTY - Recovery system for recovering methane from feed mixture of methane, carbon dioxide and volatile organic compounds (VOC's), comprises: (1) pressure swing adsorption unit with bed of adsorbent particles and operative to adsorb VOC's; (2) primary gas separation module comprising membrane selectively gas permeable to methane; (3) retentate discharge line; (4) permeate discharge line; and (5) thermal oxidizing unit.    USE - For recovering methane (claimed), useful as feedstock in industrial processes and products or as a combustible fuel to supply energy for industrial processes.    ADVANTAGE - The system provides for a safe, economical, environmentally protective recovery of methane on a commercially viable scale from solid waste landfill exhaust gas, crude natural gas and other mixtures of methane with noxious contaminants.    DETAILED DESCRIPTION - Methane recovery system for recovering methane from a feed mixture comprising methane, carbon dioxide and volatile organic compounds, comprises pressure swing adsorption unit (9) having a bed of adsorbent particles and operative to adsorb volatile organic compounds from the feed mixture onto the particles to produce an intermediate mixture of gases having composition reduced in volatile organic compounds relative to the feed mixture, and operative to desorb the volatile organic compounds from particles into a regenerating gas; primary gas separation module (12) comprising a membrane (13), which is selectively gas permeable to methane relative to carbon dioxide, a feed-retentate chamber (16) within the module on a first side of the membrane, and a permeate chamber (17) within the module on a second side of the membrane, in which the feed-retentate chamber is in fluid communication with the bed of the pressure swing adsorption unit in a manner adapted to permit transfer of the intermediate mixture into the feed-retentate chamber in contact with the first side of the membrane; retentate discharge line in fluid communication with the feed-retentate chamber adapted to withdraw from the module a retentate gas having composition enriched in methane relative to the intermediate mixture; permeate discharge line in fluid communication between the permeate chamber of the module and the bed of the pressure swing adsorption unit and which is operative to transfer a permeate gas having composition depleted in methane relative to the intermediate mixture and which permeate gas is adapted to receive desorbed volatile organic compounds from the particles of the bed to form a spent regenerating gas; and thermal oxidizing unit in fluid communication with the pressure swing adsorption unit, which is operative to destroy the volatile organic compounds in the spent regenerating gas and to produce a vent gas having composition free of volatile organic compounds.    DESCRIPTION OF DRAWING(S) - The figure is a schematic diagram of the inventive system.    Pressure swing adsorption unit (9)    Primary gas separation module (12)    Membrane (13)    Feed-retentate chamber (16)    Permeate chamber (17)