It is important to approach and achieve sustainable society. Therefore it is required to develop and establish recycling technologies of waste products. Unfortunately, composting, incineration and landfill has not been widely accepted in Japan. it is urgently required to develop optional technologies. We have been proposing "Carbonization", The most important merit of carbonization is redution of weight, volume and false odor, however, it requires energies. It is quite important to theck and reconfirm Dioxin exhaust, The authors clarifeid that carbonization plant does not releasedioxin above the limited standard. It is expected for carbonization plant to reduce gaseous temperature below 850℃ for reused