Proceedings of the Annual Conference of Japan Society of Material Cycles and Waste Management
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Showing 1-50 articles out of 255 articles from the selected issue
  • Tomohiro Tasaki, Kosuke Kawai, Koichi Tachio
    Session ID: A2-1-O
    Published: 2020
    Released: November 30, 2020
    CONFERENCE PROCEEDINGS FREE ACCESS

    We archived the waste management statistics data in Japan for half a century. Archived data includes 1) PDF files of the reports from 1972, 2) long-term data from 1971 to 2016 (except facility data) with a viewer, and 3) facility data from 1992 to 2016. The viewer enables us to look at time-series data in every municipality’s population category.

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  • Natsuki Matsuyama, Tadashi Toyama, Shinichi Muto, Kei Nishida
    Session ID: A2-2-O
    Published: 2020
    Released: November 30, 2020
    CONFERENCE PROCEEDINGS FREE ACCESS
  • Nanami Nakagawa, Syoki Kosai, Eiji Yamasue
    Session ID: A2-3-O
    Published: 2020
    Released: November 30, 2020
    CONFERENCE PROCEEDINGS FREE ACCESS

    The life cycle assessment of nuclear power generation has been widely conducted to evaluate its environmental impacts. Meanwhile, the assessment of life cycle resource use has yet to be fully executed. In most existing studies, the boundary of resource use has not included the waste generated during the resource mining. A comprehensive resource-use evaluation is required for well-understanding of nuclear power generation. Therefore, in this study, the resource efficiency of nuclear power generation is analyzed from viewpoint of mining activity based on the concept of the total material requirement (TMR). In particular, the effectiveness of the recycling system of spent fuel and radioactive waste, such as the Mixed Oxide (MOX) fuel usage and thorium fuel cycles, is evaluated. It was found that the change of different mining methods and the usage of MOX fuel mitigates the TMR per kWh (specific TMR) of nuclear power generation approximately by 60 % and 40 %, respectively. From this result, considering the mining method and promoting the introduction of MOX fuel usage would contribute to a significant improvement of specific TMR, leading to mitigation of environmental impacts caused by land disturbances through mining activities.

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  • Yotaro MITSUMATA, Luca Ciacci, Wang Tao, Seiji Hashimoto
    Session ID: A2-4-O
    Published: 2020
    Released: November 30, 2020
    CONFERENCE PROCEEDINGS FREE ACCESS
  • Naoki Takeuchi, Yuma Tsuchiya, Yasuhiro Hirai, Junya Yano, Shinichi Sa ...
    Session ID: A2-5-O
    Published: 2020
    Released: November 30, 2020
    CONFERENCE PROCEEDINGS FREE ACCESS
  • GENYA MURAKAMI, Syoki Kosai, Daiki Kurogi, Eiji Yamasue
    Session ID: A2-6-O
    Published: 2020
    Released: November 30, 2020
    CONFERENCE PROCEEDINGS FREE ACCESS

    Along with the increase in demand for road transportation, the number of end-of-life vehicles (ELVs), including cars and motorcycles, is expected to increase continuously. In practice, the vehicle sector contributes to approximately 5% of the industrial wastes around the world. Notably, the proper treatment and recycling system, particularly in developing countries such as Vietnam, has yet to be fully developed, causing vital environmental pollution and the dissipation of resources. Thus, designing the appropriate management plan of the ELVs in such countries is of significant importance to establish a recycling-based society.

    The authors have addressed so far the issues of motorcycles, which are used as major transportation means in Vietnam, particularly with a focus on gasoline motorcycles. Meanwhile, it is expected that the share of electric motorcycles will increase, resulting in the incremental disposal of different materials which are not used in gasoline motorcycles.

    Therefore, this study firstly developed the inventory data by disassembling the discarded electric motorcycle and analyzing its composition. Then, the number of total motorcycles and the amount of materials contained in obsolete motorcycles generated in Vietnam were estimated by considering the transition in the motorcycle model from gasoline to electric. This estimation was performed by using the population balance model, logistic function, and Weibull distribution. Through the analysis, it is estimated that the number of discarded motorcycles in 2030 (2,358,000 units) will increase by 1.36 times compared to that in 2000 (1,733,000 units).

    The strategies of disposal mitigation and resource recycling treatment for discarded motorcycles generated in Vietnam were further discussed based on several scenarios.

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  • YASUHIRO MATSUI, YUKIE KIRIU
    Session ID: A2-7-P
    Published: 2020
    Released: November 30, 2020
    CONFERENCE PROCEEDINGS FREE ACCESS

    This study focused on food loss from business sectors, which accounted for more than half of domestic food loss in Japan. The author aimed to get basic information which can contribute to policy prioritization and planned promotion of 3Rs of food loss from business sectors in Okayama prefecture. In particular, the author explored the detail composition and balance between supply and demand of food loss through 1) estimation of generation amount by municipality and industrial category, and 2) estimation of utilizable potential of food loss by target population of foodbank in Okayama prefecture. The author also focused on food loss generated from supermarket A in Okayama prefecture and implemented 3) scenario estimation of GHG emission and cost on 3Rs of food loss to reveal their advantages and disadvantages, including utilization as original food purpose by foodbank and recycling by composting and feed conversion.

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  • Masahiro Oguchi, Atsushi Terazono, Natsuko Kajiwara, Shinsuke Murakami
    Session ID: A2-8-P
    Published: 2020
    Released: November 30, 2020
    CONFERENCE PROCEEDINGS FREE ACCESS

    This study estimates the flows of plastics in Japan originating from waste electrical and electronic equipment (WEEE) and the flows of brominated flame retardants (BFRs) contained in those plastics. Results show that WEEE plastics are mainly recovered as mixed plastics or shredder residues. In 2017, the most recent year for which detailed data are available, a large proportion of recovered mixed plastics were being exported. However, owing to China’s import ban on post-industrial plastic waste, the amount of exported mixed plastics was expected to significantly decrease after 2018. While this is sure to increase domestic processing of mixed WEEE plastics, it appears that a substantial quantity of the recycled pellets from WEEE plastics was still being exported in 2019. The results of this study show that a large proportion of BFR-containing plastics in the bulk mixed plastics that are processed are removed through wet specific-gravity separation and X-ray sorting and then incinerated, indicating that a large fraction of the BFRs contained in the original mixed WEEE plastic is being removed from the recycling chain.

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  • Miwako Hata, Akiwa Haseyama, Tomio Nishimura
    Session ID: A2-9-P
    Published: 2020
    Released: November 30, 2020
    CONFERENCE PROCEEDINGS FREE ACCESS
  • Yoichiro Fukuda, Satoru Ono
    Session ID: A2-10-W
    Published: 2020
    Released: November 30, 2020
    CONFERENCE PROCEEDINGS FREE ACCESS
  • Koichi Tachio, Masato Yamada, Masahiro Oguchi
    Session ID: A2-11-W
    Published: 2020
    Released: November 30, 2020
    CONFERENCE PROCEEDINGS FREE ACCESS

    About 60% of the chemical substance emissions reported under the Pollutant Release and Transfer Register (PRTR) system is the amount of chemical substances transferred to waste management. It is important to understand the actual flow of chemical substances in industrial waste treatment, which is the destination of the transfer, in order to establish a comprehensive chemical substance management system. For this purpose, we report the result of the connection between the amount of chemical substances transferred to industrial waste treatment in a prefecture and the entrusted amount of industrial waste treatment described in the industrial waste disposal performance report.

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