A5037316641- Mine drainage and remediation techniques
- Metal Extraction and Bioleaching
- Mining and Resource Management
- Arsenic contamination and mitigation
- Tailings Management and Properties
- Coal and Its By-products
- Geochemistry and Elemental Analysis
- Radioactive element chemistry and processing
- Lichen and fungal ecology
- Heavy metals in environment
- Mercury impact and mitigation studies
- Bauxite Residue and Utilization
- Groundwater and Isotope Geochemistry
- Extraction and Separation Processes
- Concrete and Cement Materials Research
- Constructed Wetlands for Wastewater Treatment
- Geological Modeling and Analysis
- Phosphorus and nutrient management
- Geoscience and Mining Technology
Japan Organization for Metals and Energy Security (Japan)
2016-2025
Tohoku University
2015
For acceleration of removing toxic metals from acid mine drainage (AMD), the effects hydraulic retention time (HRT) and pH on reactor performance microbial community structure in depth direction a laboratory-scale packed-bed bioreactor containing rice bran as waste organic material were investigated. The HRT was shortened stepwise 25 to 12 h, 8 6 5 h under neutral condition using AMD neutralized with limestone (pH 6.3), 20 7 3.0). Under condition, stably operated up HRT, which shorter than...
The development of compact and cost-effective passive treatment systems is critical importance for acid mine drainage (AMD) remediation in Japan. purpose this study was to construct an AMD system comprising a sulfate-reducing bioreactor using rice bran as carbon source bacteria (SRB) demonstrate its stable operation at least year terms continuous sulfate reduction metal removal. Our 35 L comprised packed inoculum layer mixture husks, limestone, field soil, which covered with bran. During...
This study demonstrated heavy metal removal from neutral mine drainage of a closed in Kyoto prefecture pilot-scale constructed wetlands (CWs). The CWs filled with loamy soil and limestone were unplanted or planted cattails. hydraulic retention time (HRT) the was shortened gradually 3.8 days to 1.2 during 3.5 months operation. A short HRT sufficient achieve effluent standard for Cd (0.03 mg/L). cattail-planted reduced average concentrations 0.031 0.01 0.005 mg/L, Zn 0.52 0.14 0.08 Cu 0.07...
In order to prevent the mine pollution caused by acid drainage (AMD) from abandoned metal mines in Japan, treatment of AMD has been conducted with neutralization using a significant number reagents. Passive processes are attractive as an alternative because energy and cost saving one. Although passive sulfate-reducing bacteria (SRB) have investigated widely United States Europe, many those require huge area that is necessary for long hydraulic retention time (HRT). So, this research,...
In decades, various studies on passive treatment methods of acid mine drainage (AMD) have been actively conducted in order to reduce the cost AMD treatment. Open limestone channel is one most common and has already implemented mainly overseas. On other hand, it difficult secure large channels Japan due its topography, we need consider use alkaline materials with higher neutralization potential which enables successful narrower space. this study, therefore, PAdeCS, a cement-derived...
A passive treatment process using sulfate-reducing bacteria (SRB) is known to be effective in removing heavy metals from acid mine drainage (AMD), though there has been little discussion of the mechanism involved date. In this work, a column test was carried out supplementary ethanol as an electron donor for microorganisms, and reaction examined geochemical modeling X-ray absorption fine structure (XAFS) analysis. The results showed that Cu readily removed AMD on top surface (0-0.2 m), while...
In hydrothermal alteration area, arsenic and metals included in rocks can be expected to leach out from the outcrops. order perform risk assessments of leaching metals, it is important systematically understand behavior soils. this study, geochemical which were leached a was investigated. Monolith outcrop classified into layer A (weathered rocks), B (intermediate), C (host rocks) based on soil classification, then extraction experiments for individual conducted. The results showed that zone,...
Rare metals are essential for advanced industries, but, in Japan, almost all natural resources of rare imported. Therefore, to ensure stable supplies is very important. In this paper the current conditions related earths, tungsten, lithium, cobalt and platinum group explained. So far, cases earths tungsten have been mainly based on import from China. The routes also limited. increase countries which imported will be necessary with promotion recycling, development alternative materials...