Current disposal status of of used portable batteries from householdsand and their dynamic flow analysis for proper collection

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K17921
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 64050:Sound material-cycle social systems-related
• Research Institution: Kyoto University
• Principal Investigator: Yano Junya 京都大学, 環境安全保健機構, 准教授 (20522444)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 小形電池 / 一次電池 / 二次電池 / 排出実態調査 / 物質フロー分析

Outline of Final Research Achievements

According to the field survey small used portable batteries from households, 71-75% of products with built-in rechargeable batteries were products from which consumers could not remove the batteries. Therefore, it was suggested that it is important to establish a route to collect not only individual batteries but also products with built-in batteries in order to promote the collection of batteries. According to the flow estimation of primary and secondary batteries from households in Kyoto City, the collection rates of primary and secondary batteries through proper collection routes were only 23.4% and 19.6%, respectively, indicating that the collection rate of primary as well as secondary batteries is low. This suggests the importance of establishing collection routes for primary batteries as well and creating a system to encourage proper discharge.

Free Research Field

環境保全工学

Academic Significance and Societal Importance of the Research Achievements

電池のフロー推定に関する先行研究と比べて、きめ細かい排出フローに着目している点が本研究の特徴である。これにより、市民（消費者）の排出先や排出状況（電池の取り外しの有無や電池単体か内蔵製品としての排出か、等）を踏まえた排出の全容を捉えることができ、取り外しが困難な電池内蔵製品についても回収できるルートを構築することで、燃やすごみへの混入を防ぎながら家庭内ストックの排出を促すことの重要性を裏付ける結果成果を得た。