Characterization by Cluster Analysis of Various Kinds of Composts Focused on the Products Processed by Kitchen Garbage Treatment Facilities

HASE Takahito, KAWAMURA Kiyoshi

doi:10.11353/sesj.25.411

Recently, recycling of food wastes etc. has been employed, and composting of many types of organic wastes has been carried out. Our surveys of kitchen garbage composting showed that various types of composts mixed with other organic materials were produced.Such composts cannot be characterized by merely comparing them with the traditional composts. Against this background, cluster analysis was performed to characterize composts. Since compost quality items have to be described in keeping with the revised fertilizer control law, these compost quality items were also applied in the analysis to characterize the composts.<BR>By performing cluster analysis with only the quality items designated under the revised law, composts were classified into 2 groups, namely, livestock feces and urine compost and other composts. However, when other quality items such as sodium were introduced, the composts were classified into 3 groups. Each group reflected the raw material, namely, kitchen garbage, livestock feces and urine, and plant wastes. Na content, EC etc. were proved to be important in classifying the other composts into plant waste compost and kitchen garbage compost. It was verified that the cluster analysis was useful for characterizing various types of composts produced with varied raw materials.

Characterization by Cluster Analysis of Various Kinds of Composts Focused on the Products Processed by Kitchen Garbage Treatment Facilities

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