NOVELTY - Method for composting of organic wastes, involves (i) processing organic waste such as e.g. food waste discharged from food processing plant, livestock manure, and waste molasses, (ii) introducing collected waste into closed aerobic fermentor, performing aerobic fermentation, supplying oxygen, and performing pressure swing adsorption (PSA), (iii) mixing moisture-adjusting agent or moisture absorber in water, and (iv) injecting mixture into secondary fermentation tank, aging mixture, and flipping compost using rotary mixer, and collecting aged compost.    USE - The method is useful for composting of organic wastes (claimed).    DETAILED DESCRIPTION - Method for composting of organic wastes, involves (a) (i) processing organic waste such as food waste discharged from food processing plant, livestock manure, waste molasses, ethanol waste, waste discharged from slaughterhouses, sludge discharged from wastewater treatment plants, or agricultural and fishery products, (ii) introducing collected waste into closed aerobic fermentor, performing aerobic fermentation at 50-70 degrees C, supplying oxygen, and performing pressure swing adsorption (PSA), (iii) mixing moisture-adjusting agent or moisture absorber in water using scrambler, and (iv) injecting mixture, into secondary fermentation tank containing fermented material, aging mixture, and flipping compost using rotary mixer, and collecting aged compost, (b) (i) processing organic waste such as food waste discharged from food processing plant, livestock manure, waste molasses, ethanol waste, waste discharged from slaughterhouses, sludge discharged from wastewater treatment plants, or agricultural and fishery products, (ii) mixing moisture-adjusting agent or moisture absorber in water using scrambler, (iii) introducing collected waste and mixture obtained in step (b) (ii) into closed aerobic fermentor, performing aerobic fermentation at 50-70 degrees C, supplying oxygen, and performing pressure swing adsorption (PSA), and (iv) performing the above-mentioned step (a) (iv).