METHOD AND DEVICE FOR MIXING AND RECYCLING FOOD-RELATED AND WOOD-RELATED WASTES

PROBLEM TO BE SOLVED: To provide a method and a device for mixing and recycling food- related and wood-related wastes which enable enhancement of self-sufficiency of energy. SOLUTION: Food-related waste F is made to be slurry S, thereafter, is decomposed into a biogas G and a fermentation liquid M by a bio reactor 5, wood-related waste W is crushed, thereafter, is mixed with the fermentation liquid M of the proportion suitable for aging, thus, the mixture is prepared, the mixture is aged under aeration, thus, compost material C is produced and the energy for the decomposition, mixing, aeration and aging is supplied by the biogas G. Preferably, the mixture is maintained so as to have a temperature suitable for the aging by virtue of the energy of the biogas G. Electricity and high temperature water are recovered from the biogas G by a fuel cell 10 and the mixture can be maintained so as to have the temperature suitable for the aging by one part of the high temperature water. More preferably, salt- containing water is separated from the fermentation liquid M, the salt concentration is reduced and, thereafter, the fermentation liquid M is mixed with the wood-related waste W which is crushed.