Abstract: In a method and an apparatus for aerobic fermentation of biodegradable refuse to produce an odorless organic fertilizer, the apparatus includes an air blower and an air sucker each comprising a plurality of horizontal cross air pipes and pendant air line members arranged in horizontally spaced relation in a fermentation vessel. The two blowers are functionally reversible and connected to each other through a heat exchanger. Each of the blowers is provided with an automatic air flow/temperature control unit for automatic operation. The method and apparatus assure ease of discharge of the product of fermentation, increased efficiency of fermentation and conservation of time, labor and energy.