The present invention provides a closed system for processing organic waste into material for soil modification (10) comprising a unit for fermentation (1OO) having a vessel for fermentation (to2); a unit for incubation (300) having a vessel for incubation (302); a driving device (426lfor providing mechanical power; air pumps (410 and 4121; a heat exchanger for air (310); a device for adjusting humidity (312); and heat insulation (414), wherein said system is capable of measuring information of oxygen concentrations, temperatures, and humidity in the vessel for fermentation (102) and in the vessel for incubation (302); and information of the driving device's (426) motor speed, and is configured to be capable of processing one or a plurality of information selectable from the foregoing list for adjustment ofoutput powers ofthe driving device (426); the air pumps (410 and 412); orthe device for adjusting humidity (312), wherein the heat exchanger (310) is capable of using heat sources from the hot air from vessel for incubation's (302) interior, and hot air caused by the operation ofthe devices ofthe system wherein said system is free of a device for generating heat. Furthermore, the present invention provides a method for processing organic
waste in a closed system which uses the foregoing system.