Composting fishery wastes with wood meal, 1: Chemical property of the waste and the early stage of the degradation process by a composting machine under cold environment
2007
Seki, K.(Hokkaido. Forest Products Research Inst., Asahikawa (Japan)) | Saito,N. | Shirakawa, S. | Sato, M. | Kishino, M. | Yokomaku, T. | Abe, T. | Shimizu, M. | Takeda, T. | Akino, M.
Composting fishery wastes, such as starfish, sea urchin and crab shells with the inedible internal organs, was investigated using a prototype of composting machine with wood meal under cold environment. In terms of mineral composition of the wastes, nitrogen contents in the starfish and crab shell were higher than those of domestic animals excretions which are general composting materials. The machine used in this study is composed from rotate mixing container (45L), insulator shell, and unit for warm air supply (40 deg C). It was demonstrated that the organic substances of the wastes were decomposed rapidly in the machine with an inoculated aerobic bacteria even under the outside temperature of the machine (0-10 deg C). Then, the temperature of the degrading materials reached to 70 deg C within 2 days. The starfish and sea urchin shell were completely degraded to fine pieces within 2 days, and the crab shell was decomposed by 7 days except a fraction of the exoskeleton.
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