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Affiliation |
Engineering educational research section Civil and Environmental Engineering Program |
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Title |
Associate Professor |
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External Link |
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SEKITO Tomoo
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Degree 【 display / non-display 】
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Doctor (Engineering) ( 2001.12 Hokkaido University )
Research Areas 【 display / non-display 】
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Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Environmental systems for civil engineering
Papers 【 display / non-display 】
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Environmental Safety Evaluation of Substrate Glass from Waste CIS Solar Panel Cells as Used Fine Aggregate Reviewed
Dote Yutaka, Harada Hideki, Sekito Tomoo
Journal of the Japan Society of Material Cycles and Waste Management 36 ( 0 ) 1 - 8 2025
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Material Cycles and Waste Management
To evaluate the environmental safety of substrate glass (SG) from waste CIS solar panel cells as fine aggregate, JIS A 5011-1 leaching and content tests were conducted for aggregate samples and simulation samples made from SG, cement, water, coarse aggregate, and fine aggregate. In the simulation samples, SG was substituted for fine aggregate, ranging from 0 to 20% in volume. The effect of pH in leachate on selenium leaching from SG was also investigated. Although for aggregate samples, only the selenium leaching concentration exceeded the Environmentally Sound Quality Standards (ESQS) value for Leachate, for the simulation samples, selenium met the ESQS value for Leachate and Content under the 10% SG substitution rate. These results indicated that SG from the waste CIS solar panel cells used in this research could be environmentally-safely used as fine aggregate under the 10% SG substitution rate, considering the simulation sample evaluation. Furthermore, the SG substitution rate in weight which met the ESQS value for Leachate of selenium could be predicted using the leaching concentration for the aggregate sample. Although high pH increased selenium leaching from SG, the effect was small.
DOI： 10.3985/jjsmcwm.36.1
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Dote Yutaka, Sekito Tomoo
53 27 - 34 2024.10
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Faculty of Engineering, University of Miyazaki
DOI： 10.34481/0002000812
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Insolubilization of Lead in Incineration Fly Ash Using Magnesium Chloride Reviewed
Dote Yutaka, Sekito Tomoo
53 1 - 8 2024.10
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Faculty of Engineering, University of Miyazaki
DOI： 10.34481/0002000809
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Environmental Safety Evaluation of Waste CIS Photovoltaic Panels as Aggregate for Mortar Reviewed
Dote Yutaka, Harada Hideki, Sekito Tomoo
53 9 - 16 2024.10
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Faculty of Engineering, University of Miyazaki
DOI： 10.34481/0002000810
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セメント固化飛灰の比表面積が易溶解性物質の溶出量に及ぼす影響
土手裕，関戸知雄
宮崎大學工學部紀要 51 2023.10
Language：Japanese Publishing type：Research paper (bulletin of university, research institution)
Books 【 display / non-display 】
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インバース・マニュファクチャリング ハンドブック
インバース・マニュファクチャリングフォーラム監修 （ Role： Joint author）
丸善株式会社 2004.3
Language：Japanese Book type：Scholarly book
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循環型社会構築の戦略
田中信壽，田中勝 編著 （ Role： Joint author）
中央法規出版 2002.3
Language：Japanese Book type：Scholarly book
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廃棄物処理総論
田中勝 監訳代表（ Role： Joint author）
エヌ・ティーエス 1998.6
Language：Japanese Book type：Scholarly book
MISC 【 display / non-display 】
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Valorization of post-consumer plastic packaging into a composite material
関戸 知雄
Proceedings of International Exchange and Innovation Conference on Engineering & Sciences (IEICES) 9 441 - 446 2023.10
Language：English Publishing type：Rapid communication, short report, research note, etc. (scientific journal) Publisher：九州大学大学院総合理工学府
Because of its strength and simplicity, many producers prefer to package their products with various forms of plastic. The use of plastic for packaging has increased significantly due to the change in lifestyle, which has subsequently led to an increase in plastic packaging waste. However, approximately 50% of plastics are produced in disposable single-use applications. Meaning, most of them are used as once-of products and in a short space of time, they become solid waste. From the environmental preservation perspective, recycling plastic waste can save natural resources and decrease energy consumption. Among the various types of recycling management approaches, the reuse of recycled plastic material in the construction sector is considered one of the environmentally friendly recycling methods. This approach will help reduce the depletion of natural resources used as raw materials for cement production.
DOI： 10.5109/7158037
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湿原を含む家畜埋却地周辺の環境モニタリング(<特集>2010年口蹄疫-残された課題を中心に-)
鈴木祥広，竹下伸一，関戸知雄，稲垣仁根
日本草地学会誌 58 ( 4 ) 269 - 276 2013.1
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Publisher：日本草地学会
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ドイツにおける埋立地に関する基準と廃棄物処理の動向
関戸知雄、土手裕
廃棄物学会誌 19 ( 1 ) 31 - 40 2008.1
Language：Japanese Publishing type：Research paper, summary (national, other academic conference) Publisher：廃棄物学会
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Sekito T., Matsuto T., Tanaka N.
Waste Management 27 ( 10 ) 2007.7
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (bulletin of university, research institution) Publisher：Waste Management
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畜舎排水処理施設におけるエストロゲンの実態調査
鈴木祥広、中村孝洋、小山久男、関戸知雄、土手裕、増田純雄
水処理技術 47 ( 1 ) 17 - 22 2006.1
Language：Japanese Publishing type：Research paper, summary (national, other academic conference) Publisher：日本水処理技術研究会
Presentations 【 display / non-display 】
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宮崎県を事例とした溶融分離技術を利用した廃棄物資源循環モデルの提案
関戸知雄、肴倉宏史、井上繁則
全国都市清掃研究発表会 2025.2.5 一般社団法人 廃棄物資源循環学会
Event date： 2025.2.5
Language：Japanese Presentation type：Oral presentation (general)
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Evaluating the Efficiency of Community-based Waste Management (CBWM) in Dadaprejo Village, Indonesia International conference
S D Muktiningsih, T Sekito, Y Dote
The Third Biennial ICEST 2024 2024.9.27 一般社団法人 廃棄物資源循環学会
Event date： 2024.9.27
Language：English Presentation type：Oral presentation (general)
Inadequate waste management poses significant risks to public health and the environment, particularly in lower-income countries. Community-Based Waste Management (CBWM) initiatives in Indonesia and similar regions empower local communities to manage waste, yielding benefits such as reduced governmental burdens, extended landfill lifespans, environmental mitigation, and economic gains through recycling. This study examines the CBWM system in Dadaprejo Village, Batu, Indonesia, focusing on the TPS 3R Dadaprejo Mandiri (DM-TPS). The research includes a waste composition survey conducted over five periods from 2021 to 2023 and a questionnaire on resident waste sorting behavior. Findings reveal that the village generates approximately 180 tons of waste monthly, with 9.98% of resources recovered. Organic waste constitutes 46% of the waste stream, and nearly 40% of waste has potential for recycling. Survey results indicate positive resident opinions on waste separation but highlight barriers such as perceived uncleanliness and time constraints. The study underscores the need for comprehensive strategies integrating technological solutions, stakeholder collaboration, and community education to enhance CBWM effectiveness and sustainability. Further research is recommended to identify and address limiting factors in resident engagement and operational efficiency.
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Challenges and Opportunities in Community-Based Waste Management: A Case Study from Dadaprejo Village, Indonesia International conference
Muktiningsih Satwika Desantina, Sekito Tomoo, Dote Yutaka
廃棄物資源循環学会研究発表会講演集 2024.9 一般社団法人 廃棄物資源循環学会
Event date： 2024.9.9 - 2024.9.11
Language：English Presentation type：Oral presentation (general)
Inadequate waste management poses significant risks to public health and the environment, particularly in lower-income countries. Community-Based Waste Management (CBWM) initiatives in Indonesia and similar regions empower local communities to manage waste, yielding benefits such as reduced governmental burdens, extended landfill lifespans, environmental mitigation, and economic gains through recycling. This study examines the CBWM system in Dadaprejo Village, Batu, Indonesia, focusing on the TPS 3R Dadaprejo Mandiri (DM-TPS). The research includes a waste composition survey conducted over five periods from 2021 to 2023 and a questionnaire on resident waste sorting behavior. Findings reveal that the village generates approximately 180 tons of waste monthly, with 9.98% of resources recovered. Organic waste constitutes 46% of the waste stream, and nearly 40% of waste has potential for recycling. Survey results indicate positive resident opinions on waste separation but highlight barriers such as perceived uncleanliness and time constraints. The study underscores the need for comprehensive strategies integrating technological solutions, stakeholder collaboration, and community education to enhance CBWM effectiveness and sustainability. Further research is recommended to identify and address limiting factors in resident engagement and operational efficiency.
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農業系廃プラスチックの排出実態と排出量予測に関する研究
森 勇輔, 関戸 知雄, 土手 裕
廃棄物資源循環学会研究発表会講演集 2024.9 一般社団法人 廃棄物資源循環学会
Event date： 2024.9.9 - 2024.9.11
Language：English Presentation type：Oral presentation (general)
Inadequate waste management poses significant risks to public health and the environment, particularly in lower-income countries. Community-Based Waste Management (CBWM) initiatives in Indonesia and similar regions empower local communities to manage waste, yielding benefits such as reduced governmental burdens, extended landfill lifespans, environmental mitigation, and economic gains through recycling. This study examines the CBWM system in Dadaprejo Village, Batu, Indonesia, focusing on the TPS 3R Dadaprejo Mandiri (DM-TPS). The research includes a waste composition survey conducted over five periods from 2021 to 2023 and a questionnaire on resident waste sorting behavior. Findings reveal that the village generates approximately 180 tons of waste monthly, with 9.98% of resources recovered. Organic waste constitutes 46% of the waste stream, and nearly 40% of waste has potential for recycling. Survey results indicate positive resident opinions on waste separation but highlight barriers such as perceived uncleanliness and time constraints. The study underscores the need for comprehensive strategies integrating technological solutions, stakeholder collaboration, and community education to enhance CBWM effectiveness and sustainability. Further research is recommended to identify and address limiting factors in resident engagement and operational efficiency.
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浸出水中Ca濃度の経年変化予測
土手 裕, 関戸 知雄
廃棄物資源循環学会研究発表会講演集 2024.9 一般社団法人 廃棄物資源循環学会
Event date： 2024.9.9 - 2024.9.11
Language：Japanese Presentation type：Oral presentation (general)
浸出水のCa濃度の経年変化を焼却残渣のCa溶出量と浸出水量から予測することを目的として，主灰とキレート処理飛灰に対して各種溶出試験を行うとともに，既存の最終処分場から得られたデータをもとに浸出水Ca濃度の経時変化を予測するためのシナリオを作成した．その結果，浸出水中におけるCa濃度の実測値と計算値の決定係数は比較的良い一致を示したことから (決定係数:0.73)，今回作成した溶出シナリオにより，浸出水中Ca濃度を予測できる可能性が示された．また，今回の溶出シナリオを用いてR5年度に埋立を終了したとした場合のCa濃度を予測した結果，浸出水処理におけるCa除去処理が必要なくなる濃度に達するまでに35年を要することが予想された．
Grant-in-Aid for Scientific Research 【 display / non-display 】
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インドネシアのごみ銀行と集団回収による家庭ごみ資源回収システムの評価
Grant number：16K12661 2016.04 - 2018.03
科学研究費補助金 挑戦的萌芽研究
Authorship：Principal investigator
本研究では，インドネシア・マラン市を事例とし，ごみ銀行および集団回収による資源回収システムという２つの家庭ごみからの資源回収の方式に対して，住民の満足度，協力度，資源回収率，コストバランス，物質フローを明らかにする。これらの資源回収システムは，ここ数年，インドネシアで提案・実践され，自治体も資金援助をしている。しかし，それぞれの方式に対しての研究はこれまでに実施されておらず，非効率な資源回収方法が展開されている非常に可能性が高い。本研究の結果により，今後東南アジアで実施するべき資源回収方式を明らかにすることができ，資源の循環に貢献すると期待される。
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口蹄疫等による家畜の大量埋却処分地から発生する環境負荷発生量予測に関する研究
Grant number：23560648 2011.04 - 2014.03
科学研究費補助金 基盤研究(C)
Authorship：Principal investigator
平成22年度に宮崎県で発生した口蹄疫を背景に、大量の家畜を埋却処分した埋却地から発生する汚染物質による環境影響について、実験により明らかにする。実験では、カラム実験、バッチ分解実験により汚染物質（浸出水による有機汚濁物質、腐敗性ガス）の発生速度、発生量を明らかにする。数値モデルでは、特に地下水への影響について考慮し、2次元の不飽和浸透式と、有機物および窒素化合物の分解・吸着による減衰を考慮した物質移動式により、埋却地下部から浸透した汚染物質の挙動を予測する。以上の結果を適切な埋却方法提案につなげる。
Available Technology 【 display / non-display 】
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廃棄物焼却残渣の有効利用と環境安全性評価に関する研究
産業活動で発生する廃棄物の循環利用に関する研究
途上国の資源循環と廃棄物処理戦略に関する研究Related fields where technical consultation is available：・廃棄物の有効利用と環境安全性評価
Message：廃棄物の循環利用を促進するために、工学や社会科学的視点から研究を行っています。