NOVELTY - Producing ethanol from organic wastes comprises placing organic waste containing biodegradable materials, fermentable materials and lignocellulosic materials in a reactor under anaerobic conditions to cause fermentation of materials, regulating a temperature within the reactor, interruption of the fermentation, separating a liquid fraction and a solid fraction of the fermented organic waste and recovery of the liquid fraction and/or gas fraction produced by the anaerobic fermentation of organic waste, liquid and/or gas fraction containing ethanol, and concentrating and separating ethanol.    USE - The method is useful for producing ethanol (claimed), preferably bioethanol, which is useful as biofuel.    ADVANTAGE - The method is capable of simply, rapidly and economically producing the ethanol with high yield and reduced energy consumption.    DETAILED DESCRIPTION - Producing ethanol from organic wastes containing biodegradable materials, fermentable materials and lignocellulosic materials, comprises: (a) placing a quantity of organic waste containing biodegradable materials, fermentable materials and lignocellulosic materials in a reactor under anaerobic conditions and relative humidity of greater than 60%, preferably greater than 80%, to cause fermentation of the material to generate an acidification medium by producing organic acids such as volatile fatty acids; (b) monitoring and controlling pH of the materials; (c) regulating the temperature within the reactor; (d) interruption of the fermentation, separating a liquid fraction and a solid fraction of the fermented organic waste until the pH of the liquid fraction is 4.5-5.5 and recovery of the liquid and/or gaseous fraction produced by the anaerobic fermentation of organic waste, the liquid fraction and/or gaseous fraction containing ethanol; and (e) concentration and/or separation of ethanol from at least a portion of the liquid and/or gaseous fraction. An INDEPENDENT CLAIM is included for an installation for carrying out the method, comprising a first reactor for anaerobic digestion of organic wastes containing biodegradable materials, fermentable material and lignocellulosic materials, equipped with a liquid inlet for immersion or sprinkling of waste, a liquid outlet, preferably leachate outlet and/or an outlet of product gas during the fermentation, a second reactor of digester, incinerator, or storage center for receiving at least one solid fraction of the fermented, partially fermented or unfermented organic waste and to generate energy, a unit for collecting the liquid fraction called leachate of the fermented organic waste, a device for concentration and/or separation of ethanol collected in the liquid fraction, a unit for collecting gas fraction, and a device for concentration and/or separation of ethanol collected in the gas fraction, where the device for concentration and/or separation of ethanol is coupled to the second reactor of digester or incinerator or storage center and is adapted to at least partly use the energy produced in the second reactor.