| Project/Area Number |
23K20027
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
1101:Environmental analyses and evaluation, environmental conservation measure and related fields
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| Research Institution | Ritsumeikan University |
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Principal Investigator |
Nguyen Thi Thuong 立命館大学, 立命館アジア・日本研究機構, 研究員 (00979627)
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| Project Period (FY) |
2023-08-31 – 2025-03-31
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| Project Status |
Completed (Fiscal Year 2024)
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| Budget Amount *help |
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2024: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Keywords | Constructed wetlands / Heavy metals / Acid mine drainages / Clamshells / Adsorptive materials / Mine drainage / Treatment performance |
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| Outline of Research at the Start |
This study investigated the use of green technology, in this case artificially constructed wetlands for removing heavy metal pollutants from mine wastewater. In addition, an innovative recycling of industrial/agricultural by-products as substrates in CWs for mine wastewater decontamination can promote the treatment performance and contribute to reducing solid waste in a simple, cheap, and eco-friendly way.
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| Outline of Final Research Achievements |
This study aims to develop a constructed wetland (CW) using indigenous adsorptive materials to enhance heavy metal removal from acid mine drainage (AMD) in Japan. Conducted over two years (April 2023-March 2025), this study selected clamshells, a calcium-rich aquaculture by-product as the main substrate. Planted with common reed, two hybrid CWs filled with crushed clamshells effectively neutralized AMD and achieved high removal efficiencies for Mn (83.6-92.3%), Zn (99.4-100%), and other metals (97.8-100%). The results demonstrate that clamshell-based CWs offer a sustainable, low-cost solution for heavy metal removal while promoting beneficial reuse of aquaculture waste in AMD treatment. The research results were presented at 04 international conferences and 01 domestic conference, earning an Excellent Oral Presentation Award and a Young Water Professional Award. The findings were also shared with residents of Shiga Prefecture at the Water Conservation Symposium.
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| Academic Significance and Societal Importance of the Research Achievements |
This study fills key gaps in heavy metal removal in CWs by revealing removal mechanisms, microbial roles, and metal accumulation. It also supports effluent compliance, reduces costs, and promotes CW adoption. Results were shared with Kinrin residents to raise water conservation awareness.
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