Journal of the Japan Society of Material Cycles and Waste Management
Online ISSN : 1883-5899
Print ISSN : 1883-5856
ISSN-L : 1883-5856
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  • Yousuke Nakamura, Masanari Otsuka, Shinsuke Haruta, Daisuke Omori
    2020 Volume 31 Pages 1-12
    Published: 2020
    Released: February 18, 2020
    Supplementary material
    Shaking of cultures was carried out to examine the maximum P elution concentration of night soil sludge incineration ash and the effective factor for concentration using the technique of bacterial leaching (BL) with sulfur-oxidizing bacteria. The highest P elution concentration in incineration ashes from 14 facilities was 5,700 mg-P L−1 with an addition rate of 6 %. The incineration ashes with high P elution concentrations had high addition rates, P elution yields and P concentrations. The ashes with low P elution concentrations had extremely low values. In the ashes with high elution yields, instead of Fe-based flocculant, Al-based was used, and it was thought that phosphate was contained more as Al(PO4) than Ca9Al(PO4)7. Discriminant analysis to distinguish high-concentration elutions (≧3000 mg-P L−1) from low-concentrated elutions (<3000 mg-P L-1) was carried out. The significant discriminant function was obtained with a 92.6 % discriminant rate for high-concentration elutions. It was revealed that the higher the P in the elution from ash samples, the less Ca, K and Al they contained. The phosphorus elution unit cost of BL elution, calculated from use agent cost, was from 1/4 to 1/3 that of chemical elution by sulfuric acid.
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  • Tomoko Mori, Chiharu Mikajiri, Tomohiro Tasaki
    2020 Volume 31 Pages 13-24
    Published: 2020
    Released: February 29, 2020
    Supplementary material
    This study focuses on the consumer experience of e-commerce reuse, a concept which has become popular in recent years. The paper analyzes the influence of the e-commerce reuse experience on clothing disposal behaviors by consumers. The results/analysis of an online survey targeting females aged 15-49 revealed that consumers prefer e-commerce reuse to conventional reuse routes, such as second-hand stores, if they have the opportunity to experience sales using e-commerce reuse. Even if a consumer does not currently use e-commerce reuse modes, wasteful behavior surrounding unnecessary clothing disposal can be prevented. At the same time, reuse behavior using a second-hand store gets promoted if a consumer has taken up e-commerce reuse in the past. These results indicate that through the experience of e-commerce reuse, consumers are learning about this re-use method and better recognize the reusability of clothing they no longer need.
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