A5008614992- Metal Extraction and Bioleaching
- Minerals Flotation and Separation Techniques
- Mine drainage and remediation techniques
- Extraction and Separation Processes
- Arsenic contamination and mitigation
- Heavy metals in environment
- Geochemistry and Elemental Analysis
- Recycling and Waste Management Techniques
- Radioactive element chemistry and processing
- Chromium effects and bioremediation
- Bacterial Genetics and Biotechnology
- Corrosion Behavior and Inhibition
- Biofuel production and bioconversion
- Mineral Processing and Grinding
- Microbial Metabolic Engineering and Bioproduction
- Microbial Fuel Cells and Bioremediation
- RNA and protein synthesis mechanisms
- Environmental remediation with nanomaterials
- Enzyme Production and Characterization
- Metallurgical Processes and Thermodynamics
- Microbial metabolism and enzyme function
- Genomics and Phylogenetic Studies
- Microbial Community Ecology and Physiology
- Nanoparticles: synthesis and applications
- Iron oxide chemistry and applications
Kyushu University
2016-2025
Environmental and Water Resources Engineering
2017
Research Institute of Innovative Technology for the Earth
2007-2013
Bangor University
2002-2011
University of Wales
2007
Osaka University
1999
ABSTRACT Microorganisms were enumerated and isolated on selective solid media from a pilot-scale stirred-tank bioleaching operation in which polymetallic sulfide concentrate was subjected to biologically accelerated oxidation at 45°C. Four distinct prokaryotes isolated: three bacteria (an Acidithiobacillus caldus -like organism, thermophilic Leptospirillum sp., Sulfobacillus sp.) one archaeon (a Ferroplasma isolate). The relative numbers of these changed the reactors sampled, isolate became...
Two novel extremely acidophilic, iron-oxidizing actinobacteria were isolated, one from a mine site in North Wales, UK (isolate T23T), and the other geothermal Yellowstone National Park, Wyoming, USA (Y005T). These new belong to subclass Acidimicrobidae, contrast only classified member of (Acidimicrobium ferrooxidans), both isolates obligate heterotrophs. The isolate was mesophilic grew as small rods, while moderate thermophile long filaments, forming macroscopic flocs liquid media. Both...
Abstract The oxidative dissolution of pyrite (FeS 2 ) by pure and mixed cultures moderately thermophilic acidophiles was studied in shake flask pH‐controlled bioreactors, incubated at 45°C. Various combinations seven eubacteria (a Leptospirillum sp. (MT6), Acidimicrobium ferrooxidans , Acidithiobacillus caldus an Alicyclobacillus (Y004), three Sulfobacillus spp.) one archaeon ( Ferroplasma MT17) were examined. Pyrite determined measuring changes soluble iron generation acidity, microbial...
Systematic screening of secretion proteins using an approach based on the completely sequenced genome Corynebacterium glutamicum R revealed 405 candidate signal peptides, 108 which were able to heterologously secrete active-form alpha-amylase derived from Geobacillus stearothermophilus. These comprised 90 general secretory (Sec)-type, 10 twin-arginine translocator (Tat)-type and eight Sec-type with presumptive lipobox peptides. Only Sec- Tat-type signals directed high-efficiency secretion....
The effect of controlling the redox potential (Eh) on chalcopyrite bioleaching kinetics was studied as a new aspect control during bioleaching, and its mechanism investigated by employing "normalized" solution (Enormal) reaction model. Different Eh ranges were established use different acidophiles (Sulfobacillus acidophilus YTF1; Sulfobacillus sibiricus N1; Acidimicrobium ferrooxidans ICP; Acidiplasma sp. Fv-AP). Cu dissolution very susceptible to real-time change in reaction. It found that...
Despite its growing importance as a Cu resource, studies on tennantite bioleaching are highly limited. One of the key challenges in processing such Cu-As sulfides is their refractoriness and solubilisation toxic As. The ultimate goal to achieve selective with simultaneous immobilisation As leach residues. This study investigated effectiveness activated carbon (AC)-assisted concentrate using mixed culture containing various “strong” “weak” Fe-oxidising bacteria/archaea plus S-oxidising...
Arsenic (As) contamination in water poses significant environmental and health risks, particularly mining regions. Scorodite (FeAsO4·2H2O) is a highly stable compound for As immobilization, traditionally synthesized under high concentrations extreme conditions, such as elevated temperatures pressures. This study explores sustainable alternative by utilizing Fe-sludge, waste by-product from acid mine drainage (AMD) treatment, novel Fe source biogenic scorodite formation mediated the...
This study developed a semi-passive treatment system for manganese (Mn)- and zinc (Zn)-containing mine water by repurposing neutralization tank into biologically active stirred reactor. Laboratory-scale experiments demonstrated efficient removal of Mn2+ (>97%) Zn2+ (>80%) with hydraulic retention times (HRTs) as short 6 h—significantly faster than traditional passive systems. XRD XANES analyses identified the predominant formation birnessite, layered Mn oxide, during oxidation, Zn...