Mine drainage pollution continues to be a significant environmental issue in Japan, particularly from abandoned or closed mines that release wastewater contaminated with heavy metals such as cadmium (Cd), lead (Pb), arsenic (As), zinc (Zn), iron (Fe), and manganese (Mn). With approximately 5,000 abandoned mines in Japan, around 100 still require treatment due to remove high concentrations of these pollutants, which pose risks to water resources, ecosystems, and public health. Conventional treatment methods, such as neutralization and coagulation, are effective but costly,
technically complex, and generate secondary waste. Constructed wetlands (CWs) offer an eco-friendly and cost-effective alternative by utilizing the natural processes of plants, filter materials, and microorganisms to remove contaminants. In our research, we classified 100 mine drainage samples using multivariate analysis, grouping them based on heavy metal concentrations relative to effluent standards. This approach allows us to design CWs that are tailored to the unique characteristics of mine drainage. Our recent studies also explore strategies to optimize CW performance, including the selection of appropriate plants, the use of advanced substrates, the introduction of external carbon sources to enhance microbial activity, and the design of multi-stage CW systems. By implementing CWs, we aim to reduce mine drainage pollution, protect Japan’s water resources, and promote sustainable environmental management.
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