NOVELTY - The process for treating organic wastes, comprises continuously and/or simultaneously treating the wastes by methanization to produce a gas and water and treating the wastes in thermophilic or mesophilic aerobic treatment phase at 60-70 degrees C, and drying or sterilizing the obtained final product. The gas produced during methanization step is used for the treatment of wastes in mesophilic or thermophilic aerobic treatment phase. The residual water obtained from the methanization is used to dilute the organic waste treated during mesophilic or thermophilic aerobic treatment phase.    USE - The process is useful for treating organic wastes such as household wastes, agri-food industrial wastes and green wastes, where the treated organic wastes are useful in agriculture for fertilizing crops.    ADVANTAGE - The process is capable of energy-efficiently, rapidly and automatically treating the organic wastes in an environmental-friendly manner using a simple and compact device, avoids the generation of bad odor thus providing a safe environment during the treatment, and ensures effective storage and transport of wastes during the treatment without any external devices thus it is cost-effective.    DETAILED DESCRIPTION - The process for treating organic wastes, comprises continuously and/or simultaneously treating the wastes by methanization to produce a gas and water and treating the wastes in thermophilic or mesophilic aerobic treatment phase at 60-70 degrees C, and drying or sterilizing the obtained final product. The gas produced during methanization step is used for the treatment of wastes in mesophilic or thermophilic aerobic treatment phase. The residual water obtained from the methanization is used to dilute the organic waste treated during mesophilic or thermophilic aerobic treatment phase. The residues obtained from the methanization step are fully incorporated into the waste present in the mesophilic or thermophilic aerobic treatment phase. The methanization treatment step is determined according to the energy needs for the mesophilic or thermophilic aerobic treatment step. The energy of the gas is recuperated by combustion of the gas. The waste air obtained from the mesophilic or thermophilic aerobic treatment step is heat-treated during the combustion of gas obtained from the methanization step. Walls of the tanks containing the wastes are heated during the mesophilic or thermophilic aerobic treatment step to enhance the development of a thermophilic or mesophilic microorganism flora in the wastes, and are maintained in a temperature by contacting them with hot water or heated steam from the combustion of gas produced by methanization. The sludge is dried or sterilized using a part of energy produced during methanization treatment step. An INDEPENDENT CLAIM is included for a device for treating organic wastes.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a modular and autonomous treatment unit (Drawing includes no-English language text).