2023 年度実施状況報告書

Development of hybrid multi-stage constructed wetlands based on indigenous adsorptive materials for sustainable heavy metal treatment from mine drainages in Japan

研究課題

研究課題/領域番号	23K20027
研究機関	立命館大学
研究代表者	NGUYEN THI・THUONG 立命館大学, 立命館アジア・日本研究機構, 研究員 (00979627)
研究期間 (年度)	2023-08-31 – 2025-03-31
キーワード	Constructed wetlands / Heavy metals / Adsorptive materials / Mine drainage / Treatment performance
研究実績の概要	This study aims to develop a constructed wetland (CW) using indigenous adsorptive materials to improve heavy metal removal from mine drainage in Japan. The research spans 2 years (April 2023 - March 2025). In the first year (FY 2023), five materials (corncob biochar, rice husk, steel slag, clamshell, and limestone) were tested as substrates for treating acid mine drainage (AMD) rich in manganese and zinc. Clamshell and corncob biochar, as seafood industrial and agricultural by-products with high adsorption capacity, hydraulic conductivity, and AMD neutralization ability, were chosen for developing hybrid CWs. Additionally, the common reed, with the highest manganese removal, will be the main plant in these hybrid CWs.
現在までの達成度	現在までの達成度 2: おおむね順調に進展している理由 The goals for the first fiscal year were achieved as planned. The conception and design of the experiment were structured. The type of mine drainage used in this study was identified, with low pH and high concentrations of manganese and zinc. The batch experiments were conducted to identify the best potential filter media and plants for developing hybrid CWs. The clamshell and corncob biochar were selected and characterized.
今後の研究の推進方策	For the second fiscal year (FY 2024), two hybrid-constructed wetland systems will be installed to evaluate the treatment performance for heavy metal removal, focusing on manganese and zinc. The pathways for heavy metal removal and the role of the microorganism community will be clarified. Additionally, the results of this research will be presented at both domestic and international conferences and summarized for publication.
次年度使用額が生じた理由	The remaining amount will be transferred to the next fiscal year. It will be used to purchase materials, chemicals, and equipment for further experiments. Additionally, it will be used to pay for activities (organizing international workshop, doing business trips, attending conferences) related to this research.