Researcher basic information

• Doctor of Philosophy in the field of Sustainable Resources Engineering, Hokkaido University, Sep. 2020

• https://researchmap.jp/takahikoarima?lang=en

• https://orcid.org/0000-0001-8814-7522
• https://jglobal.jst.go.jp/detail?JGLOBAL_ID=202201017335165781

• https://orcid.org/0000-0001-8814-7522

• 202201017335165781

• Environmental remediation
• Arsenic
• Acid mine drainage
• Abandoned mine site
• Naturally occuring heavy metals
• Water quality
• Geo-Environment
• Heavy metals contamination

• Energy Engineering, Earth resource engineering, Energy sciences
• Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention), Geotechnical engineering
• Environmental Science/Agriculture Science, Environmental load reduction and remediation

• Bachelor's degree program, School of Engineering
• Master's degree program, Graduate School of Engineering
• Doctoral (PhD) degree program, Graduate School of Engineering

Research activity information

• Oct. 2025, The 29th Regional Symposium on Chemical Engineering RSCE 2025, Best Presentation Award
  Fabrication of Chitosan-coated Slag for Acid Mine Drainage: Adsorption in Passive Treatment Systems
  Casey Oliver A. Turingan;Takahiko Arima;Naoki Hiroyoshi;Tsutomu Sato
• Feb. 2025, 北海道大学大学院工学研究院, 令和６年度工学研究院若手教員奨励賞
• Nov. 2024, International Symposium on Earth Science and Technology 2024 (CINEST), CINEST AWARD for BEST PRESENTATION
  Characteristics of Heavy Metal Adsorption in Base Ground Affected by Acid Mine Drainage from an Abandoned Mine
  Taichi Matsusaki, Thaw Dar Wunn, Haruki Aotsuka, Abel Abebe Ersulo, Takaya Hamai, Masao Okumura, Mufalo Walubita, Takahiko Arima, Shingo Tomiyama, and Toshifumi Igarashi
• May 2024, The 22nd Global Joint Seminar on Geo-Environmental Engineering, Best Paper Presentation Award
  The role of chitosan molecular weight in the adsorption and selectivity of heavy metal ions
  Casey Oliver A. Turingan, Takahiko Arima, Tsutomu Sato
• May 2023, The 21st Global Joint Seminar on Geo-Environmental Engineering, Best Paper Presentation Award
  Comparison of Arsenic Leaching Concentration from Excavated Rocks Between Pre-Construction and Construction Phases of Hokkaido Shinkansen
  Keita Nakajima, Takahiro Yamamoto, Takahiko Arima, Toshifumi Igarashi
• Oct. 2022, International Workshop on Resource Science and Sustainable Development organized by ICREMER, Akita University, Best Presentation Award
  Hydrogeological characteristics around the Yoshino mine and impacts of its acid mine drainage on the local water resources
  Thaw Dar Wunn, Kenani Malama, Naoto Nishimoto, Takahiko Arima, Takaya Hamai, Singo Tomiyama and Toshifumi Igarashi
• May 2019, 18th Joint Seminar on Geo-environmental Engineering, Concordia University, Montreal, Canada, Best Paper Presentation Award
  Comparison of leaching behavior of arsenic and selenium from mudstone by in situ and laboratory column experiments
• May 2011, 10th Joint Seminar on Geo-environmental Engineering, National Institute of Technology Kagawa College, Kagawa, Japan, Best Paper Presentation Award
  Combined bottom volcanic ash adsorption layer and calcium carbonate system for disposing excavated rocks producing acidic leachate with toxic elements

• Upcycling spent slag into chitosan-coated composites for adsorption of manganese, nickel, and zinc under circumneutral pH: Implications for passive treatment of mine/rock drainages
  Casey Oliver A. Turingan; Takahiko Arima; Walubita Mufalo; Mylah Villacorte-Tabelin; Carlito B. Tabelin; Naoki Hiroyoshi; Tsutomu Sato
  Cleaner Waste Systems, 100520, 100520, Elsevier BV, May 2026, [Peer-reviewed]
  Scientific journal
• The Conservation of Architectural Heritage Structures Built with Tuff and Coral Rock: A Systematic Review and Bibliometric Analysis of Geopolymer Formulation, Application, Compatibility and Durability
  Kent Benedict Aleonar Salisid; Raul Lucero; Reymarvelos Oros; Mylah Villacorte-Tabelin; Theerayut Phengsaart; Shengguo Xue; Jiaqing Zeng; Ivy Corazon A. Mangaya-ay; Takahiko Arima; Ilhwan Park; Mayumi Ito; Sanghee Jeon; Carlito Baltazar Tabelin
  Minerals, 16, 4, 426, 426, MDPI AG, 20 Apr. 2026, [Peer-reviewed]
  Scientific journal, The conservation of tuff- and coral rock-built architectural heritage structures (AHS) is challenging because access to original tuff and coral rock has become difficult and severely limited due to urbanization, land reclamation, the depletion of stone quarries, anti-mining and anti-quarrying legislation. An emerging approach to address this issue is to create compatible “replacement” rocks via geopolymerization, a process that is more sustainable and greener than the use of conventional cement and concrete. To explore the potential of geopolymers for AHS conservation strategies, the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were implemented; 103 eligible articles were identified and classified into geopolymers for AHS (34 articles), tuff-built AHS (60 articles), and coral rock-built AHS (9 articles). Tuff substrates in AHSs appear in a variety of colors (yellowish-brown, grayish-cream, reddish-brown, pale greenish-gray and pink hues), densities (1.0–2.5 g/m3), and compressive strengths (3–100 MPa). Meanwhile, coral rock substrates in AHSs appear in whitish-cream color and are coarse-pored (1–5 MPa), fine-grained (8–15 MPa), and calcarenite (50–60 MPa). In terms of geopolymer formulation, metakaolin was reported as the most popular main precursor or admixture, while NaOH and Na2SiO3 were used simultaneously as alkaline activators. Aggregates used in geopolymer formulations depended on local availability, including quartz sand, river sand, crushed stones, carbonate stones, volcanic rock, volcanic sand, tuff, brick, ceramic tiles, and waste materials. Aesthetics, chemical composition, physical attributes, and mechanical properties have been identified as key criteria to ensure geopolymer compatibility for AHS conservation application. To date, geopolymers have been applied for AHS conservation as repair mortars, consolidants (i.e., grout and adhesives), and masonry strengthening (i.e., fiber-reinforced mortar). Finally, geopolymers formulated for AHS conservation have similar durability as the original substrate based on accelerated aging tests (i.e., salt mist, wet-dry, and freeze–thaw) and long-term outdoor exposure experiments.
• Unravelling hydrogeochemical dynamics of seasonal acid mine drainage water quality in an abandoned mine site, Japan
  Abel Abebe Ersulo; Takahiko Arima; Haruki Aotsuka; Taichi Matsusaki; Thaw Dar Wunn; Aeron Elvin Dela Cruz; Xiaobo Niu; Walubita Mufalo; Takaya Hamai; Masao Okumura; Hisatoshi Furuya; Shingo Tomiyama; Naoki Hiroyoshi
  Environmental Monitoring and Assessment, 198, 4, Springer Science and Business Media LLC, 20 Mar. 2026, [Peer-reviewed]
  Scientific journal
• Heavy Metal Pollution Assessment and Survey of Rhizosphere Bacterial Communities from Saccharum spontaneum L. in a Rehabilitated Nickel-Laterite Mine in the Philippines
  Shiela W. Mainit; Carlito Baltazar Tabelin; Florifern C. Paglinawan; Jaime Q. Guihawan; Alissa Jane S. Mondejar; Vannie Joy T. Resabal; Maria Reina Suzette B. Madamba; Dennis Alonzo; Aileen H. Orbecido; Michael Angelo Promentilla; Joshua B. Zoleta; Dayle Tranz Daño; Ilhwan Park; Mayumi Ito; Takahiko Arima; Theerayut Phengsaart; Mylah Villacorte-Tabelin
  Minerals, 15, 8, 881, 881, MDPI AG, 21 Aug. 2025, [Peer-reviewed]
  Scientific journal, In this study, we assessed soil pollutants and surveyed the bacterial communities using 16S rRNA sequencing to better understand how to improve rehabilitation strategies for nickel-laterite mines in the Philippines. Representative soil samples and rhizospheres from Saccharum spontaneum L. in three post-mining sites rehabilitated in 2015, 2017, and 2019 were collected and analyzed. X-ray diffraction (XRD) identified iron oxyhydroxides, silicates, and clays as major soil components. Based on the pollution load index and contamination degree, the 2015A and 2015B sites were classified as “pristine” and had a “low degree of pollution”, while the remaining sites (2017A, 2017B, 2019A, and 2019B) were considered “moderately contaminated” with nickel, chromium, cobalt, lead, zinc, and copper. An analysis of the bacterial community composition revealed that the phyla Proteobacteria and Actinobacteria, along with the genus Ralstonia, were the most abundant groups across both control and rehabilitated sites. Our results showed that the soil pH and organic matter contents were strongly linked to specific bacterial community composition. These taxa have potential for inoculation in nickel-laterite soils to promote the growth of hyperaccumulator plants. Our results also showed a significant correlation between the structure of the bacterial communities and nickel, chromium, and manganese soil contents, but not with rehabilitation time. Furthermore, we identified the genera Diaphorobacter as potential bioindicators because they are sensitive to nickel and chromium. This study provides valuable baseline data on heavy metal pollution and microbial diversity in a rehabilitated Ni-laterite mine site.
• Geochemical behavior and environmental implications of arsenic in roasted tailings from the Vatukoula Epithermal Gold Mine in Fiji
  Takahiko Arima; Yoshihiko Arita; Apete Soro; Shusaku Yamazaki; Ayaka Hashimoto; Walubita Mufalo; Toshifumi Igarashi
  Environmental Geochemistry and Health, 47, 8, Springer Science and Business Media LLC, 20 Jul. 2025, [Peer-reviewed], [Lead author, Corresponding author]
  Scientific journal
• Abies sachalinensis naturally growing at a sedimentary site acquires iron tolerance via detoxicants production, elemental transfer adjustment, and root endophytic Phialocephala bamuru producing siderophores
  Toshikatsu Haruma; Hayato Masuya; Keiko Yamaji; Yosuke Yamamoto; Naoto Nishimoto; Takahiko Arima; Shingo Tomiyama
  PLOS One, 20, 6, e0325294, e0325294, Public Library of Science (PLoS), 17 Jun. 2025, [Peer-reviewed]
  Scientific journal, Abies sachalinensis naturally growing in heavy metal-rich sedimentary sites exhibits heavy metal tolerance. Although root endophytes increase heavy metal tolerance in various plants, their effects on the tolerance in conifers are not focused on. The objective of our study was to clarify the heavy metal tolerance, considering root endophytes. We measured the heavy metal concentrations in root-zone soil, leaves, stems, fine roots along with heavy metal detoxicants. We also isolated root endophytes and identified the endophyte with the highest siderophore production activity for chelating heavy metals. Results showed high Fe accumulation in fine roots, where malic acid, catechin, and condensed tannins detoxify Fe. A lower Fe/Mn ratio in leaves than roots suggests that A. sachalinensis could regulate Fe and Mn transfer to mitigate Fe phytotoxicity in leaves. Among the isolated root endophytes, Phialocephala bamuru exhibited the highest siderophore production, which could detoxify Fe in A. sachalinensis. These results indicated that A. sachalinensis have multiple Fe tolerance: Fe detoxification production and Fe/Mn ratio adjustment. Moreover, interactions with root endophytes like Ph. bamuru producing siderophores could increase the Fe tolerance and facilitate revegetation on soil containing heavy metal like old mine sites by conifers including A. sachalinensis.
• Pilot-scale stabilization of toxic metal leachates from zinc plant residues using half-burnt dolomite: implications for remediation at Kabwe legacy mine in Zambia
  Walubita Mufalo; Takahiko Arima; Toshifumi Igarashi; Mayumi Ito; Tsutomu Sato; Shingo Tomiyama; Imasiku Nyambe; Marthias Silwamba; Hokuto Nakata; Shouta Nakayama; Mayumi Ishizuka
  Environmental Geochemistry and Health, 47, 7, Springer Science and Business Media LLC, 16 Jun. 2025, [Peer-reviewed]
  Scientific journal
• Synthesis of Iron-Based and Aluminum-Based Bimetals: A Systematic Review
  Jeffrey Ken B. Balangao; Carlito Baltazar Tabelin; Theerayut Phengsaart; Joshua B. Zoleta; Takahiko Arima; Ilhwan Park; Walubita Mufalo; Mayumi Ito; Richard D. Alorro; Aileen H. Orbecido; Arnel B. Beltran; Michael Angelo B. Promentilla; Sanghee Jeon; Kazutoshi Haga; Vannie Joy T. Resabal
  Metals, 15, 6, 603, 603, MDPI AG, 27 May 2025, [Peer-reviewed]
  Scientific journal, Bimetals—materials composed of two metal components with dissimilar standard reduction–oxidation (redox) potentials—offer unique electronic, optical, and catalytic properties, surpassing monometallic systems. These materials exhibit not only the combined attributes of their constituent metals but also new and novel properties arising from their synergy. Although many reviews have explored the synthesis, properties, and applications of bimetallic systems, none have focused exclusively on iron (Fe)- and aluminum (Al)-based bimetals. This systematic review addresses this gap by providing a comprehensive overview of conventional and emerging techniques for Fe-based and Al-based bimetal synthesis. Specifically, this work systematically reviewed recent studies from 2014 to 2023 using the Scopus, Web of Science (WoS), and Google Scholar databases, following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, and was registered under INPLASY with the registration number INPLASY202540026. Articles were excluded if they were inaccessible, non-English, review articles, conference papers, book chapters, or not directly related to the synthesis of Fe- or Al-based bimetals. Additionally, a bibliometric analysis was performed to evaluate the research trends on the synthesis of Fe-based and Al-based bimetals. Based on the 122 articles analyzed, Fe-based and Al-based bimetal synthesis methods were classified into three types: (i) physical, (ii) chemical, and (iii) biological techniques. Physical methods include mechanical alloying, radiolysis, sonochemical methods, the electrical explosion of metal wires, and magnetic field-assisted laser ablation in liquid (MF-LAL). In comparison, chemical protocols covered reduction, dealloying, supported particle methods, thermogravimetric methods, seed-mediated growth, galvanic replacement, and electrochemical synthesis. Meanwhile, biological techniques utilized plant extracts, chitosan, alginate, and cellulose-based materials as reducing agents and stabilizers during bimetal synthesis. Research works on the synthesis of Fe-based and Al-based bimetals initially declined but increased in 2018, followed by a stable trend, with 50% of the total studies conducted in the last five years. China led in the number of publications (62.3%), followed by Russia, Australia, and India, while Saudi Arabia had the highest number of citations per document (95). RSC Advances was the most active journal, publishing eight papers from 2014 to 2023, while Applied Catalysis B: Environmental had the highest number of citations per document at 203. Among the three synthesis methods, chemical techniques dominated, particularly supported particles, galvanic replacement, and chemical reduction, while biological and physical methods have started gaining interest. Iron–copper (Fe/Cu), iron–aluminum (Fe/Al), and iron–nickel (Fe/Ni) were the most commonly synthesized bimetals in the last 10 years. Finally, this work was funded by DOST-PCIEERD and DOST-ERDT.
• Hydrogeochemical Characteristics of an Abandoned Copper Mine Tailings Storage Facility Producing Circumneutral Seepage Waters
  Walubita Mufalo; Kenani Malama; Takahiko Arima; Shingo Tomiyama; Toshifumi Igarashi
  Mine Water and the Environment, Springer Science and Business Media LLC, 04 Mar. 2025, [Peer-reviewed]
  Scientific journal
• Changes in chemical speciation and mobility of arsenic during the mixing of arsenic-bearing “snow-melting” system effluent and river water in the Ishikari Plain, Japan
  Takahiko Arima; Masataka Shimamura; Asumi Sakaguchi; Walubita Mufalo; Carlito Baltazar Tabelin; Toshifumi Igarashi
  Environmental Pollution, 125998, 125998, Elsevier BV, Mar. 2025, [Peer-reviewed], [Lead author, Corresponding author]
  Scientific journal
• Utilization of the Finer Particle Fraction of Arsenic-Bearing Excavated Rock Mixed with Iron-Based Adsorbent as Sorption Layer
  Daisuke Ishigami; Takahiko Arima; Satoshi Shinohara; Yutaka Kamijima; Keijirou Ito; Tasuma Suzuki; Keita Nakajima; Walubita Mufalo; Toshifumi Igarashi
  Minerals, 15, 3, 242, 242, MDPI AG, 26 Feb. 2025, [Peer-reviewed], [Corresponding author]
  Scientific journal, Excavated rocks generated during tunnel construction may pose an environmental hazard due to the release of acidic leachate containing potentially toxic elements (PTEs). Addressing this concern requires strategic countermeasures against mitigating the release of PTEs. This study investigated the efficacy of a novel approach for managing altered excavated rocks that generate acidic leachates with elevated arsenic (As) by utilizing the finer altered rock as a base material for the sorption layer. The proposed method involves classifying the altered excavated rocks into coarse (9.5–37.5 mm) and finer (<9.5 mm) fractions, with the finer fractions incorporated with iron (Fe)-based adsorbent to form a bottom sorption layer for the disposal of coarser rock samples. Leaching behavior and As immobilization efficiency were assessed through shaking, stirring leaching tests, batch sorption tests, and column tests under varying particle size fractions of the rock samples. Results indicate that altered finer rock fractions exhibit increased As leaching under shaking conditions due to enhanced dissolution. The addition of >1% of Fe-based adsorbent to the finer rock in the sorption layer effectively suppressed As leaching concentration, meeting the management criterion of <0.3 mg/L for specially controlled contaminated soils in Japan. Batch sorption tests using the finer rock samples with the Fe-based adsorbent confirmed their efficacy as effective adsorbents. This efficacy was further elucidated in column experiments consisting of the coarse rock samples and fine altered rock samples mixed with the Fe based adsorbent at the bottom as a sorption layer. Results showed that the sorption layer effectively decreased the As leached from the rock layer, utilizing the altered excavated fine rock as a base material in the sorption layer. This approach highlights the potential for repurposing excavated rocks as sorption media, enabling sustainable management strategies for As-contaminated rocks. This study provides an innovative framework for integrating adsorption-based remediation, contributing to sustainable countermeasure strategies for excavated rocks.
• A Mixed Media Approach Using Locally Available Neutralizing Materials for the Passive Treatment of Acid Mine Drainage
  Joshua Pocaan; Casey Oliver A. Turingan; Carlito Baltazar Tabelin; Joshua B. Zoleta; Takahiko Arima; Ilhwan Park; Mayumi Ito; Aileen H. Orbecido
  Heliyon, e41984, e41984, Elsevier BV, Jan. 2025, [Peer-reviewed]
  Scientific journal
• Polytetrafluoroethylene (PTFE) microplastics affect angiogenesis and central nervous system (CNS) development of duck embryo
  Axll Ross A. Campos; Kyan Marlu B. Luza; Merrah Joy Blaya Subebe; Carlito Baltazar Tabelin; Theerayut Phengsaart; Takahiko Arima; Reya Seno; Roselyn Butalid; Art Brian Escabarte; Ahmad Reza F. Mazahery; Gloria Shiela E. Coyoca; Mylah Villacorte-Tabelin
  Emerging Contaminants, 11, 1, 100433, 100433, Elsevier BV, 2025, [Peer-reviewed]
  Scientific journal
• Impact of effluents from a closed mine on the surrounding water resources: Groundwater contamination of the historical abandoned mine site in Japan
  Thaw Dar Wunn; Takahiko Arima; Walubita Mufalo; Takaya Hamai; Masao Okumura; Kyu Kyu Mar; Shingo Tomiyama; Toshifumi Igarashi
  Environmental Monitoring and Assessment, 197, 1, Springer Science and Business Media LLC, 26 Dec. 2024, [Peer-reviewed]
  Scientific journal
• Integrated spectral image registration protocol for enhanced land pollution assessment and management: bridging satellite and drone data for high-resolution mapping
  Natsuo Okada; Hisatoshi Toriya; Angesom Gebretsadik; Takahiko Arima; Yoko Ohtomo; Youhei Kawamura
  Journal of Material Cycles and Waste Management, Springer Science and Business Media LLC, 04 Oct. 2024, [Peer-reviewed]
  Scientific journal
• An AI-Based Approach for Developing a Recommendation System for Underground Mining Methods Pre-Selection
  Elsa Pansilvania Andre Manjate; Natsuo Okada; Yoko Ohtomo; Tsuyoshi Adachi; Bernardo Miguel Bene; Takahiko Arima; Youhei Kawamura
  Mining, 4, 4, 747, 765, MDPI AG, 02 Oct. 2024, [Peer-reviewed]
  Scientific journal, Selecting the most appropriate mining method to recover mineral resources is a critical decision-making task in mining project development. This study introduces an artificial intelligence-based mining methods recommendation system (AI-MMRS) for the pre-selection of underground mining methods. The study integrates and evaluates the capability of two approaches for mining methods selection (MMS): the memory-based collaborative filtering (CF) approach aided by the UBC-MMS system to predict the top-3 relevant mining methods and supervised machine learning (ML) classification algorithms to enhance the effectiveness and novelty of the AI-MMRS, addressing the limitations of the CF approach. The results reveal that the memory-based CF approach achieves an accuracy ranging from 81.8% to 87.9%. Among the classification algorithms, artificial neural network (ANN) and k-nearest neighbors (KNN) classifiers perform the best, with accuracy levels of 66.7% and 63.6%, respectively. These findings demonstrate the effectiveness and viability of both approaches in MMS, acknowledging their limitations and the need for continuous training and optimization. The proposed AI-MMRS for the pre-selection stage supplemented by the direct involvement of mining professionals in later stages of MMS, has the potential to significantly aid in the MMS decision-making, providing data-driven and experience-based recommendations following the ongoing evolution of mining practices.
• Assessment of Total Mercury Levels Emitted from ASGM into Soil and Groundwater in Chami Town, Mauritania
  Mohamed Mamoune Maha; Akito Matsuyama; Takahiko Arima; Atsushi Sainoki
  Sustainability, 16, 18, 7992, 7992, MDPI AG, 12 Sep. 2024, [Peer-reviewed]
  Scientific journal, Artisanal and small-scale gold mining (ASGM) is a serious growing concern in Sub-Saharan Africa. In Mauritania, recent gold discoveries in the north and northwest have led to an increase in ASGM centers, reflecting trends across the region and posing considerable risks of mercury (Hg) contamination. Notwithstanding this fact, the extent of mercury contamination in the region remains unclear due to insufficient knowledge on the mechanisms of Hg dispersion in hyper-arid regions. In light of this, the present study aimed to acquire fundamental knowledge to elucidate the dispersion mechanism of mercury through conducting soil and groundwater sampling in and around Chami town, Mauritania, where ASGM activities have intensified. We analyzed 180 soil samples and 5 groundwater samples for total mercury (total Hg) using cold vapor atomic absorption spectrometry (CVAAS) and atomic fluorescence spectrometry (AFS) methods. The total Hg levels in soil samples ranged from 0.002 to 9.3 ppm, with the highest concentrations found at ASGM sites. Groundwater samples exhibited low total Hg levels (0.25–1.25 ng/L). The total Hg content in soil and groundwater samples was below Japanese standards, yet soil samples from hotspot points exceeded other international standards. Our study emphasizes the Hg dispersion patterns around Chami town, suggesting a gradual decrease in total Hg with increasing distance from ASGM sites and a potential influence of wind dynamics. The knowledge accumulated in this study provides essential insights into the Hg dispersion mechanisms in Chami town, laying the foundation for establishing a predictive model of Hg contamination in hyper-arid regions.
• Evaluation of formation of solubility-limited solid phase of calcium- and magnesium-bearing immobilizers by microscopic observation and element mapping analysis.
  Ayaka HASHIMOTO; Shusaku YAMAZAKI; Keita NAKAJIMA; Toshitaka TAMURA; Seiichi OBANA; Toshifumi IGARASHI; Takahiko ARIMA
  Japanese Geotechnical Journal, 19, 3, 273, 284, The Japanese Geotechnical Society, 01 Sep. 2024, [Peer-reviewed]
  Scientific journal
• Long-term performance of the adsorption layer system for the recycling and repurposing of arsenic-bearing mudstone as road embankment
  Mitsunori Kajiyoshi; Takahiro Yamamoto; Takahiko Arima; Walubita Mufalo; Ayaka Hashimoto; Takahiro Oumi; Shusaku Yamazaki; Carlito Baltazar Tabelin; Toshifumi Igarashi
  Chemosphere, 363, 142985, 142985, Elsevier BV, Sep. 2024, [Peer-reviewed], [Corresponding author]
  Scientific journal
• Frequency distribution of naturally occurring arsenic leached from excavated rocks of Hokkaido Shinkansen tunnels between Shin-Hakodate-Hokuto and Oshamambe
  Keita Nakajima; Takahiro Yamamoto; Takahiko Arima; Walubita Mufalo; Toshifumi Igarashi
  Soils and Foundations, 64, 3, 101445, 101445, Elsevier BV, Jun. 2024, [Peer-reviewed]
  Scientific journal
• Optimizing multi-spectral ore sorting incorporating wavelength selection utilizing neighborhood component analysis for effective arsenic mineral detection
  Natsuo Okada; Hiromasa Nozaki; Shinichiro Nakamura; Elsa Pansilvania Andre Manjate; Angesom Gebretsadik; Yoko Ohtomo; Takahiko Arima; Youhei Kawamura
  Scientific Reports, 14, 1, Springer Science and Business Media LLC, 21 May 2024, [Peer-reviewed]
  Scientific journal, Abstract
  
  Arsenic contamination not only complicates mineral processing but also poses environmental and health risks. To address these challenges, this research investigates the feasibility of utilizing Hyperspectral imaging combined with machine learning techniques for the identification of arsenic-containing minerals in copper ore samples, with a focus on practical application in sorting and processing operations. Through experimentation with various copper sulfide ores, Neighborhood Component Analysis (NCA) was employed to select essential wavelength bands from Hyperspectral data, subsequently used as inputs for machine learning algorithms to identify arsenic concentrations. Results demonstrate that by selecting a subset of informative bands using NCA, accurate mineral identification can be achieved with a significantly reduced the size of dataset, enabling efficient processing and analysis. Comparison with other wavelength selection methods highlights the superiority of NCA in optimizing classification accuracy. Specifically, the identification accuracy showed 91.9% or more when utilizing 8 or more bands selected by NCA and was comparable to hyperspectral data analysis with 204 bands. The findings suggest potential for cost-effective implementation of multispectral cameras in mineral processing operations. Future research directions include refining machine learning algorithms, exploring broader applications across diverse ore types, and integrating hyperspectral imaging with emerging sensor technologies for enhanced mineral processing capabilities.
• Fluoride leaching from tuff breccia and its removal by natural and commercial adsorbents
  Takahiko Arima; Nohara Yokobori; Walubita Mufalo; Keita Nakajima; Carlito Baltazar Tabelin; Toshifumi Igarashi
  Chemosphere, 354, 141735, 141735, Elsevier BV, Apr. 2024, [Peer-reviewed], [Lead author, Corresponding author]
  Scientific journal
• Applying Nonnegative Matrix Factorization for Underground Mining Method Selection Based on Mining Projects' Historical Data
  Elsa Pansilvania Andre MANJATE; Yoko OHTOMO; Takahiko ARIMA; Tsuyoshi ADACHI; Bernardo Miguel BENE; Youhei KAWAMURA
  International Journal of the Society of Materials Engineering for Resources, The Society of Materials Engineering for Resources of Japan, 31 Mar. 2024, [Peer-reviewed]
  Scientific journal
• Isolation and Characterization of Indigenous Ureolytic Bacteria from Mindanao, Philippines: Prospects for Microbially Induced Carbonate Precipitation (MICP)
  Kryzzyl M. Maulas; Charla S. Paredes; Carlito Baltazar Tabelin; Mark Anthony Jose; Einstine M. Opiso; Takahiko Arima; Ilhwan Park; Walubita Mufalo; Mayumi Ito; Toshifumi Igarashi; Theerayut Phengsaart; Edrhea Villas; Sheila L. Dagondon; Ephrime B. Metillo; Mylene M. Uy; Al James A. Manua; Mylah Villacorte-Tabelin
  Minerals, 14, 4, 339, 339, MDPI AG, 26 Mar. 2024, [Peer-reviewed]
  Scientific journal, Microbially induced carbonate precipitation (MICP), a widespread phenomenon in nature, is gaining attention as a low-carbon alternative to ordinary Portland cement (OPC) in geotechnical engineering and the construction industry for sustainable development. In the Philippines, however, very few works have been conducted to isolate and identify indigenous, urease-producing (ureolytic) bacteria suitable for MICP. In this study, we isolated seven, ureolytic and potentially useful bacteria for MICP from marine sediments in Iligan City. DNA barcoding using 16s rDNA identified six of them as Pseudomonas stutzeri, Pseudomonas pseudoalcaligenes, Bacillus paralicheniformis, Bacillus altitudinis, Bacillus aryabhattai, and Stutzerimonas stutzeri but the seventh was not identified since it was a bacterial consortium. Bio-cementation assay experiments showed negligible precipitation in the control (without bacteria) at pH 7, 8, and 9. However, precipitates were formed in all seven bacterial isolates, especially between pH 7 and 8 (0.7–4 g). Among the six identified bacterial species, more extensive precipitation (2.3–4 g) and higher final pH were observed in S. stutzeri, and B. aryabhattai, which indicate better urease production and decomposition, higher CO2 generation, and more favorable CaCO3 formation. Characterization of the precipitates by scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) and attenuated total reflectance Fourier transform spectroscopy (ATR-FTIR) confirmed the formation of three carbonate minerals: calcite, aragonite, and vaterite. Based on these results, all six identified indigenous, ureolytic bacterial species from Iligan City are suitable for MICP provided that the pH is controlled between 7 and 8. To the best of our knowledge, this is the first report of the urease-producing ability and potential for MICP of P. stutzeri, P. pseudoalcaligenes, S. stutzeri, and B. aryabhattai.
• Insights on hazardous metal bioaccessibility, and groundwater impacted by Zn residues from a legacy mine and risk evaluation of adjacent soils
  Walubita Mufalo; Takahiko Arima; Toshifumi Igarashi; Mayumi Ito; Tsutomu Sato; Shingo Tomiyama; Imasiku Nyambe; Carlito Baltazar Tabelin; Hokuto Nakata; Shouta Nakayama; Mayumi Ishizuka
  Environmental Geochemistry and Health, 46, 2, Springer Science and Business Media LLC, 06 Feb. 2024, [Peer-reviewed]
  Scientific journal
• Properties of Half-burnt Dolomite and Phosphate Compound for Immobilizing Heavy Metals Released from the Mine Residues of Kabwe, Zambia
  Takahiko ARIMA; Kenta NOTO; Walubita MUFALO; Toshifumi IGARASHI; Mayumi ITO; Tsutomu SATO; Hokuto NAKATA; Shouta NAKAYAMA; Mayumi ISHIZUKA
  Resources Processing, 70, 3, 141, 150, The Resources Processing Society of Japan, 2024, [Peer-reviewed], [Lead author, Corresponding author]
  Scientific journal
• Assessment of Total Mercury levels in soil and groundwater: Case Study Chami City and Its Environs in Mauritania
  Mohamed Mamoune Maha; Akito Matsuyama; Takahiko Arima; Atsushi Sainoki
  Proceedings of International Symposium on Earth Science and Technology 2023, 60, 64, Nov. 2023, [Peer-reviewed]
• Modified Diglycolamide Resin: Characterization and Potential Application for Rare Earth Element Recovery
  Junnile L. Romero; Carlito Baltazar Tabelin; Ilhwan Park; Richard D. Alorro; Joshua B. Zoleta; Leaniel C. Silva; Takahiko Arima; Toshifumi Igarashi; Takunda Mhandu; Mayumi Ito; Steffen Happel; Naoki Hiroyoshi; Vannie Joy T. Resabal
  Minerals, 13, 10, 1330, 1330, MDPI AG, 14 Oct. 2023, [Peer-reviewed]
  Scientific journal, Rare earth elements (REEs) are crucial for green energy applications due to their unique properties, but their extraction poses sustainability challenges because the global supply of REEs is concentrated in a few countries, particularly China, which produces 70% of the world’s REEs. To address this, the study investigated TK221, a modified extraction chromatographic resin featuring diglycolamide (DGA) and carbamoyl methyl phosphine oxide (CMPO), as a promising adsorbent for REE recovery. The elemental composition and functional groups of DGA and CMPO on the polystyrene-divinylbenzene (PS-DVB) support of TK221 were confirmed using scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), and X-ray photoelectron spectroscopy (XPS). The adsorption kinetics of neodymium (Nd), yttrium (Y), cerium (Ce), and erbium (Er) followed the pseudo-second-order kinetic model and Langmuir isotherm, indicating monolayer chemisorption. Furthermore, iron (Fe) adsorption reached apparent equilibrium after 360 min, with consistent Fe adsorption observed at both 360 min and 1440 min. The inclusion of Fe in the study is due to its common presence as an impurity in most REE leachate solutions. The Fe adsorption isotherm results are better fitted with the Langmuir isotherm, implying chemisorption. Maximum adsorption capacities (qmax) of the resin were determined as follows: Nd (45.3 mg/g), Ce (43.1 mg/g), Er (35.1 mg/g), Y (15.6 mg/g), and Fe (12.3 mg/g). ATR-FTIR analysis after adsorption suggested that both C=O and P=O bands shifted from 1679 cm−1 to 1618 cm−1 and 1107 cm−1 to 1142 cm−1 for Y, and from 1679 cm−1 to 1607 cm−1 and 1107 cm−1 to 1135 cm−1 for Ce, implying possible coordination with REEs. These results suggest that TK221 has a huge potential as an alternative adsorbent for REE recovery, thus contributing to sustainable REE supply diversification.
• Evaluation of lifetime of calcium- and magnesium-bearing immobilizers for waste rocks containing arsenic
  Ayaka HASHIMOTO; Sho HASEGAWA; Toshitaka TAMURA; Seiichi OBANA; Takahiko ARIMA; Toshifumi IGARASHI
  Japanese Geotechnical Journal, 18, 2, 169, 179, The Japanese Geotechnical Society, 01 Jun. 2023, [Peer-reviewed]
  Scientific journal
• Immobilization of Pb and Zn leached from mining residue materials in Kabwe, Zambia: Performance of calcined dolomite in column experiments
  Walubita Mufalo; Pawit Tangviroon; Takahiko Arima; Toshifumi Igarashi; Mayumi Ito; Tsutomu Sato; Kenta Noto; Takeshi Kawashima; Imasiku Nyambe; Hokuto Nakata; Shouta Nakayama; Mayumi Ishizuka
  Journal of Geochemical Exploration, 249, 107209, 107209, Elsevier BV, Jun. 2023, [Peer-reviewed]
  Scientific journal
• Miscanthus sinensis contributes to the survival of Pinus densiflora seedlings at a mining site via providing a possible functional endophyte and maintaining symbiotic relationship between P. densiflora and endophytes from high soil temperature stress
  Toshikatsu Haruma; Kohei Doyama; Xingyan Lu; Kenta Noji; Hayato Masuya; Takahiko Arima; Shingo Tomiyama; Keiko Yamaji
  PLOS ONE, 18, 5, e0286203, e0286203, Public Library of Science (PLoS), 23 May 2023, [Peer-reviewed]
  Scientific journal, At a sedimentary site in an old mine site, Miscanthus sinensis formed patches, where Pinus densiflora seedlings could grow better compared with those outside the patches, indicating that M. sinensis would improve P. densiflora seedling establishment. The purpose of this study was to understand the mechanisms by which M. sinensis facilitates the survival of P. densiflora seedlings by considering the soil properties, heavy metal tolerance, and root endophytes in P. densiflora seedlings at the sedimentary site. The sedimentary site, which is a bare ground, contained high concentrations of Fe, indicating that plants should be exposed to Fe and high soil temperature stresses. Measurement of soil temperature revealed that M. sinensis suppressed sharp increases and alternation of soil temperature, resulting in reducing high soil temperature stress in P. densiflora seedlings. To adapt to the Fe stress environment, P. densiflora outside and inside the patches produced Fe detoxicants, including catechin, condensed tannin, and malic acid. Ceratobasidium bicorne and Aquapteridospora sp. were commonly isolated from P. densiflora seedlings outside and inside the patches as root endophytes, which might enhance Fe tolerance in the seedlings. Aquapteridospora sp., which is considered as a dark-septate endophyte (DSE), was also isolated from the roots of M. sinensis, suggesting that M. sinensis might play a source of a root endophyte to P. densiflora seedlings. Ceratobasidium bicorne could be classified into root endophytes showing symbiosis and weak pathogenicity to host plants. Therefore, high soil temperature stress would weaken P. densiflora seedlings, causing root endophytic C. bicorne to appear pathogenic. We suggested that P. densiflora could adapt to the Fe stress environment via producing Fe detoxicants, and M. sinensis would facilitate the establishment of P. densiflora seedlings in the sedimentary site by providing a DSE, Aquapteridospora sp., and maintaining symbiosis of C. bicorne from high soil temperature stress.
• Geochemical Characterization of Rock Samples from Selected Fiji Mine Sites to Evaluate On-Site Environmental Vulnerabilities
  Apete Tuiyaro Soro; Walubita Mufalo; Takahiko Arima; Carlito Baltazar Tabelin; Toshifumi Igarashi
  Minerals, 13, 5, 661, 661, MDPI AG, 11 May 2023, [Peer-reviewed]
  Scientific journal, Although mining contributes to about 1.4% of Fiji’s gross domestic product (GDP), the excavated rocks from mining may have detrimental effects on the environment. In this study, rock samples from five Fiji mine sites were selected to assess their geochemical characteristics from an environmental point of view. The mineralogical and chemical constituents, release and retention mechanisms of hazardous elements, and acid/neutralization potential of the rock samples were investigated to understand their environmental impacts on-site. The results showed that sulfide minerals typically found in the rock samples, such as pyrite, chalcopyrite, and sphalerite were responsible for the release of hazardous elements such as Cu, Pb, and Zn via oxidation. Leachates of rock samples from Mt Kasi, Nukudamu, and Wainivesi exceeded the World Health Organization (WHO) regulatory limit for Cu (2 mg/L), Pb (0.01 mg/L), and Zn (3 mg/L) in drinking water. In contrast, no hazardous elements were leached from the Tuvatu and Vatukoula rock samples, which could be attributed to the dissolution of calcite and dolomite that buffered the pH and limited heavy metal mobility. The acid–base accounting (ABA) and accelerated weathering test by hydrogen peroxide indicated that most of the rock samples containing sulfide minerals were likely to generate acidity. Furthermore, the results highlighted that once carbonate minerals are depleted in the rock samples, acid mine drainage (AMD) generation is inevitable. These findings reaffirm the need for committed effort in environmental management of the mine sites to prevent environmental issues associated with AMD.
• Utilization of Palm Oil Fuel Ash (POFA) as an Admixture for the Synthesis of a Gold Mine Tailings-Based Geopolymer Composite
  Einstine M. Opiso; Carlito Baltazar Tabelin; Christian V. Maestre; John Paul J. Aseniero; Takahiko Arima; Mylah Villacorte-Tabelin
  Minerals, 13, 2, 232, 232, MDPI AG, 06 Feb. 2023, [Peer-reviewed]
  Scientific journal, The repurposing of gold (Au) mine tailings from artisanal and small-scale mining (ASGM) operations via alkali activation technology is a promising strategy for waste reduction in developing countries. Direct activation of mine tailings, however, is challenging because these materials contain relatively low aluminum (Al)-bearing minerals. In this study, palm oil fuel ash (POFA) was elucidated as a high Al-bearing waste derived-admixture for the synthesis of an ASGM tailings-based geopolymer composite. Semi-quantitative XRD analysis showed that the tailings contained quartz (SiO2) (~58%), pyrite (FeS2) (~20%) and calcite (CaCO3) (~15%) with minor to trace amounts of aluminosilicates (~7%). Substantial amounts of environmentally regulated pollutants such as mercury (Hg) (40 mg/kg), lead (Pb) (8430 mg/kg) and arsenic (As) (300 mg/kg) were also found in the tailings. SEM-EDS, XRD and ATR-FTIR results showed the successful formation of a hybrid geopolymer-CASH matrix, which improved the unconfined compressive strength (UCS) of geopolymer composites from ~5 MPa to ~7 MPa. Furthermore, POFA did not significantly affect the thermal resistivity of geopolymer composites based on thermal analysis. Finally, the TCLP results showed that the Pb leaching concentrations from ASGM tailings exceeded environmental standards (~15,000 µg/L), which was suppressed after alkali activation to 300–500 µg/L. This means that POFA addition to ASGM tailings-based geopolymer composite improved not only its applicability as backfill, pavements and bricks but also its ability to immobilize toxic elements.
• Development of a three-step approach to repurpose nickel-laterite mining waste into magnetite adsorbents for As(III) and As(V) removal: Synthesis, characterization and adsorption studies
  Einstine M. Opiso; Carlito Baltazar Tabelin; Leonard Marc Ramos; Leonar Jun R. Gabiana; Marybeth Hope T. Banda; Jet Ryan Y. Delfinado; Aileen H. Orbecido; Joshua B. Zoleta; Ilhwan Park; Takahiko Arima; Mylah Villacorte-Tabelin
  Journal of Environmental Chemical Engineering, 11, 1, 108992, 108992, Elsevier BV, Feb. 2023, [Peer-reviewed]
  Scientific journal
• Oosporein Produced by Root Endophytic Chaetomium cupreum Promotes the Growth of Host Plant, Miscanthus sinensis, under Aluminum Stress at the Appropriate Concentration
  Toshikatsu Haruma; Kohei Doyama; Xingyan Lu; Takahiko Arima; Toshifumi Igarashi; Shingo Tomiyama; Keiko Yamaji
  Plants, 12, 1, 36, 36, MDPI AG, 21 Dec. 2022, [Peer-reviewed]
  Scientific journal, Chaetomium cupreum, a root endophyte in Miscanthus sinensis, enhances Al tolerance in M. sinensis by changing aluminum (Al) localization and the production of a siderophore, oosporein, which chelates Al for detoxification. Oosporein has various functions, including insecticidal activity, phytotoxicity, antifungal activity, and a siderophore. In our study, we focused on the detoxification effect of oosporein as a siderophore and on the growth of M. sinensis under Al exposure. In addition, the phytotoxicity of oosporein to M. sinensis was confirmed to compare with those in Lactuca sativa and Oryza sativa as control plants. Under Al stress, oosporein promoted plant growth in M. sinensis seedlings at 10 ppm, which was the same concentration as that detected in M. sinensis roots infected with C. cupreum in our previous study. Oosporein also showed low phytotoxicity to M. sinensis compared with L. sativa at even high concentrations of oosporein. These results suggest that the concentration of oosporein in M. sinensis roots would be maintained at the appropriate concentration to detoxify Al and would promote M. sinensis growth under Al stress, although oosporein would show low phytotoxicity to the natural host plant, M. sinensis, compared with the non-host plant, L. sativa.
• Geochemical audit of a historical tailings storage facility in Japan: Acid mine drainage formation, zinc migration and mitigation strategies
  Carlito Baltazar Tabelin; Asuka Uyama; Shingo Tomiyama; Mylah Villacorte-Tabelin; Theerayut Phengsaart; Marthias Silwamba; Sanghee Jeon; Ilhwan Park; Takahiko Arima; Toshifumi Igarashi
  Journal of Hazardous Materials, 438, 129453, 129453, Elsevier BV, Sep. 2022, [Peer-reviewed]
  Scientific journal
• Effects of Environmental Factors on the Leaching and Immobilization Behavior of Arsenic from Mudstone by Laboratory and In Situ Column Experiments
  Takahiko Arima; Ryosuke Sasaki; Takahiro Yamamoto; Carlito Baltazar Tabelin; Shuichi Tamoto; Toshifumi Igarashi
  Minerals, 11, 11, 1220, 1220, MDPI AG, 02 Nov. 2021, [Peer-reviewed], [Lead author, Corresponding author]
  Scientific journal, Hydrothermally altered rocks generated from underground/tunnel projects often produce acidic leachate and release heavy metals and toxic metalloids, such as arsenic (As). The adsorption layer and immobilization methods using natural adsorbents or immobilizer as reasonable countermeasures have been proposed. In this study, two sets of column experiments were conducted, of which one was focused on the laboratory columns and other on the in situ columns, to evaluate the effects of column conditions on leaching of As from excavated rocks and on adsorption or immobilization behavior of As by a river sediment (RS) as a natural adsorbent or immobilizer. A bottom adsorption layer consisting of the RS was constructed under the excavated rock layer or a mixing layer of the excavated rock and river sediment was packed in the column. The results showed that no significant trends in the adsorption and immobilization of As by the RS were observed by comparing laboratory and in situ column experiments because the experimental conditions did not influence significant change in the leachate pH which affects As adsorption or immobilization. However, As leaching concentrations of the in situ experiments were higher than those of the laboratory column experiments. In addition, the lower pH, higher Eh and higher coexisting sulfate ions of the leachate were observed for the in situ columns, compared to the results of the laboratory columns. These results indicate that the leaching concentration of As became higher in the in situ columns, resulting in higher oxidation of sulfide minerals in the rock. This may be due to the differences in conditions, such as temperature and water content, which induce the differences in the rate of oxidation of minerals contained in the rock. On the other hand, since the leachate pH affecting As adsorption or immobilization was not influenced significantly, As adsorption or immobilization effect by the RS were effective for both laboratory and in situ column experiments. These results indicate that both in situ and laboratory column experiments are useful in evaluating leaching and adsorption of As by natural adsorbents, despite the fact that the water content which directly affects the rate of oxidation is sensitive to weathering conditions.
• Leaching and Adsorption Behavior of Arsenic and Selenium from Excavated Mudstones Considering Their Chemical Species
  Takahiko ARIMA; Ryosuke SASAKI; Carlito Baltazar TABELIN; Shuichi TAMOTO; Takahiro YAMAMOTO; Tangviroon PAWIT; Toshifumi IGARASHI
  Journal of MMIJ, 136, 6, 64, 76, Mining and Materials Processing Institute of Japan, 30 Jun. 2020, [Peer-reviewed], [Lead author, Corresponding author]
  Scientific journal
• Simultaneous leaching of arsenite, arsenate, selenite and selenate, and their migration in tunnel-excavated sedimentary rocks: II. Kinetic and reactive transport modeling
  Carlito Baltazar Tabelin; Ryosuke Sasaki; Toshifumi Igarashi; Ilhwan Park; Shuichi Tamoto; Takahiko Arima; Mayumi Ito; Naoki Hiroyoshi
  Chemosphere, 188, 444, 454, Elsevier BV, Dec. 2017, [Peer-reviewed]
  Scientific journal
• Simultaneous leaching of arsenite, arsenate, selenite and selenate, and their migration in tunnel-excavated sedimentary rocks: I. Column experiments under intermittent and unsaturated flow
  Carlito Baltazar Tabelin; Ryosuke Sasaki; Toshifumi Igarashi; Ilhwan Park; Shuichi Tamoto; Takahiko Arima; Mayumi Ito; Naoki Hiroyoshi
  Chemosphere, 186, 558, 569, Elsevier BV, Nov. 2017, [Peer-reviewed]
  Scientific journal
• Characterization and evaluation of arsenic and boron adsorption onto natural geologic materials, and their application in the disposal of excavated altered rock
  Carlito Baltazar Tabelin; Toshifumi Igarashi; Takahiko Arima; Daiki Sato; Takeshi Tatsuhara; Shuichi Tamoto
  Geoderma, 213, 163, 172, Elsevier BV, Jan. 2014, [Peer-reviewed]
  Scientific journal
• Combined neutralization–adsorption system for the disposal of hydrothermally altered excavated rock producing acidic leachate with hazardous elements
  Takeshi Tatsuhara; Takahiko Arima; Toshifumi Igarashi; Carlito Baltazar Tabelin
  Engineering Geology, 139-140, 76, 84, Elsevier BV, Jun. 2012, [Peer-reviewed]
  Scientific journal
• Reduction and Retardation of Arsenic and Boron Leached from Excavated Rocks by Volcanic Ash Adsorption Layer
  Takahiko ARIMA; Daiki SATO; Toshifumi IGARASHI; Shuichi TAMOTO; Takeshi TATSUHARA
  Journal of the Japan Society of Engineering Geology, 52, 3, 88, 96, Japan Society of Engineering Geology, 2011, [Peer-reviewed], [Lead author, Corresponding author]
  Japanese, Scientific journal, Column experiments consisting of crushed rock containing arsenic (As) and boron (B), and volcanic ash with high amorphous aluminum and iron contents were conducted to evaluate the leaching behaviors and adsorption characteristics of these toxic elements from the rock. The results showed that the As and B concentrations in the effluent were much higher than the environmental standards, and that the addition of a bottom adsorption layer decreased the concentrations of As and B and delayed their peak appearances in the leachate. The pHvalues of the effluent from the rock layer were alkaline ranging from 10 to 11, but interactions between the pore water and minerals in the volccanic ash layer buffered the pHvalues (approximately pH7). The As and B migration in the columns were simulated using an advective-dispersive equation with a Henry type adsorption model. As a result, the model expressed the leaching behavior of B well whereas the model did not express that of As. The distribution coefficient, Kd, of B evaluated from the column experiments also agreed well with that obtained from batch adsorption experiments. This indicates that the model is effective in evaluating B migration. However, since As adsorption was affected by many factors, such as pH, coexisting ions, and other experimental conditions, simulated Kd values of As did not agree with the observed ones. The above results suggest that a bottom adsorption layer is effective in the reduction and retardation of heavy metals leached from a rock layer and in the neutralization of the effluent pH. Furthermore, the B migration can be predicted using the Kd value derived from batch experiments.
• Column adsorption of toxic elements leached from excavated rocks by a bottom volcanic ash layer
  Takahiko Arima; Toshifumi Igarashi; Shuichi Tamoto; Takeshi Tatsuhara
  International Association for Engineering Geology，Auckland，New Zealand, Sep. 2010, [Peer-reviewed], [Lead author, Corresponding author]
  International conference proceedings

• 人工資材による自然由来重金属等を含む掘削土対策の設計・施工マニュアル［第2版］北海道環境保全技術協会技術レポートNo.9
  参考資料４
  一般社団法人北海道環境保全技術協会技術委員会, Sep. 2021, [Contributor]

• 画像解析とAIを利用したごみピット攪拌状況の最適化判定システム（もりやまエコパークでの取り組み）
  山本晃康; 有馬孝彦
  AI 時代における計算科学の社会実装を実現する学際ハブ拠点 第3回シンポジウム, 08 Oct. 2025
  [Invited]
• 北海道における自然由来重金属等含有土による環境問題への対応事例
  有馬孝彦
  第2回土壌汚染リスク評価 若手セミナー －リスク評価とコミュニケーション－, 23 Dec. 2024
  [Invited]
• Novel screening method for arsenic-bearing excavated rock utizling hyperspectral imaging and deep learning
  Takahiko Arima; Sounosuke Chiba; Natsuo Okada; Ayaka Hashimoto; Keita Nakajima; Toshifumi Igarashi
  Internatinal Conference on Water: From Pollution to Purification (ICW-2024), 13 Dec. 2024, Invited oral presentation
  47014426;45934120;45934104, [Invited]
• Performance of adsorption layer system composed of arsenic-bearing excavated rocks mixed with artificial materials against arsenic-bearing rock layer
  Keisuke Muroi; Takahiko Arima; Ayaka Hashimoto; Keita Nakajima; Daisuke Ishigami; Toshifumi Igarashi
  International Symposium on Earth Science and Technology 2024 (CINEST), 28 Nov. 2024, Oral presentation
  47015472;43634651
• Characteristics of Heavy Metal Adsorption in Base Ground Affected by Acid Mine Drainage from an Abandoned Mine
  Taichi Matsusaki; Thaw Dar Wunn; Haruki Aotsuka; Abel Abebe Ersulo; Takaya Hamai; Masao Okumura; Mufalo Walubita; Takahiko Arima; Shingo Tomiyama; Toshifumi Igarashi
  International Symposium on Earth Science and Technology 2024 (CINEST), 28 Nov. 2024, Oral presentation
  41881044
• 自然由来重金属等を含有する掘削土の評価・対策への新たなアプローチ
  有馬 孝彦; 室井 桂介; 千葉 奏之介; 岡田 夏男; 橋本 綾佳; 石神 大輔; 中嶋 啓太; 五十嵐 敏文
  資源・素材2024（秋田）, 10 Sep. 2024, Invited oral presentation
  47014426;47015472;45934104;45934120;43634651
• 吉乃鉱山における多様な解析手法を用いた酸性坑廃水の水質形成メカニズムの解明
  有馬 孝彦; 青塚 陽生; Dar Wunn Thaw; 松嵜 泰智; Mufalo Walubita; 濱井 昂弥; 奥村 維男; 富山 眞吾
  資源・素材2024（秋田）, 10 Sep. 2024, Invited oral presentation
• 吉乃鉱山をモデルケースとした総合的な鉱害防止対策の検討について
  濱井 昂弥; 正木 悠聖; 瀬元 祐希; 近藤 正隆; 奥村 維男; 有馬 孝彦; 富山 眞吾
  資源・素材2024（秋田）, 10 Sep. 2024, Invited oral presentation
• 高空間分解能マルチスペクトル画像を用いた資源探査方法の開発
  岡田 夏男; 有馬 孝彦; 鳥屋 剛毅; 大友 陽子; 北原 格; 川村 洋平
  資源・素材2024（秋田）, 10 Sep. 2024, Oral presentation
• 酸性ポテンシャルを有する鉱滓集積場における亜鉛等の重金属溶出特性評価
  渡部健人; 石堂倫太朗; Mufalo Walubita; 有馬孝彦
  2024 年度資源・素材学会北海道支部春季講演会, 01 Jun. 2024, Oral presentation
• Hydrogeochemical Characteristics of a Tailing Facility Producing Circumneutral Seepage Waters
  Walubita Mufalo; Kenani Malama; Takahiko Arima; Shingo Tomiyama; Toshifumi Igarashi
  22nd Global Joint Seminar on Geo -Environmental Engineering, 23 May 2024, Oral presentation
• Chemical Fractionation Of Arsenic In Rock Samples After Adding Calcium- And Magnesium-Bearing Immobilizers
  Ayaka Hashimoto; Keita Nakajima; Takahiko Arima; Toshifumi Igarash
  22nd Global Joint Seminar on Geo -Environmental Engineering, 23 May 2024, Oral presentation
• The Role of Chitosan Molecular Weight in the Adsorption and Selectivity of Heavy Metal Ions
  Casey Oliver A. Turingan; Takahiko Arima; Tsutomu Sato
  22nd Global Joint Seminar on Geo -Environmental Engineering, 23 May 2024, Oral presentation
• 坑廃水処理とCO2キャプチャリング
  有馬 孝彦
  札幌×秋田ゼロカーボンワークショップ，秋田大学, 09 Dec. 2023, Public discourse
• Potential of heavy metal adsorption by soils contaminated with acid mine drainage
  Takahiko Arima, Taichi Matsusaki, Thaw Dar Wunn, Takaya Hamai, Mufalo Walubita, Shingo Tomiyama, Toshifumi Igarashi
  Cooperative Intarnational-Network for Earth Science and Technology 2023, Fukuoka, Japan, 01 Dec. 2023, Oral presentation
• Hazardous metal bioaccessibility, and groundwater impacted by Zn Residues in Kabwe, Zambia and hazard evaluation of adjacent soils
  Mufalo Walubita; Takahiko Arima; Toshifumi Igarashi; Mayumi Ito; Tsutomu Sato; Imasiku Nyambe; Hokuto Nakata; Shouta Nakayama; Mayumi Ishizuka
  The 9th Joint Seminar on Geo-environmental Engineering and Recycling, Sapporo, Japan, 01 Nov. 2023, Oral presentation
• 酸性化に対応した不溶化材による岩石からの高濃度ヒ素溶出水吸着効果
  篠原 智志; 神 大輔; 伊藤 圭二郎; 有馬 孝彦; 五十嵐 敏文
  令和5年土木学会全国大会第78回年次学術講演会, 15 Sep. 2023
• 北海道の国道における自然由来重金属等を含むトンネル掘削土の対策事例
  山本 隆広,近江 隆洋,五十嵐 敏文,有馬 孝彦
  2023年度資源・素材関係学協会合同秋季大会（松山）, 14 Sep. 2023
• 異高度スペクトル画像レジストレーションプロトコル開発の検討
  岡田 夏男; 有馬 孝彦; 佐々木 太一; 鳥屋 剛毅; 富山 眞吾; 川村 洋平
  2023年度資源・素材関係学協会合同秋季大会（松山）, 14 Sep. 2023
• フライアッシュを利用したCO2の炭酸塩化特性について
  石堂 倫太郎; 玉村 修司; 村上 拓馬; 松本 裕之; 鈴木 良明; 伊東 義博; 有馬 孝彦; 五十嵐 敏文
  2023年度資源・素材関係学協会合同秋季大会（松山）, 13 Sep. 2023
• Development of a Different Altitude Spectral Image Registration Protocol Utilizing Digital Twin
  Natsuo Okada; Hisatoshi Toriya; Takahiko Arima; Yoko Ohtomo; Takahiro Shigemi; Armandine Rasoanindriana; Hiromasa Nozaki; Shinichiro Nakamura; Youhei Kawamura
  Water-Rock Interaction WRI-17, 18 Aug. 2023
• ヒ素を溶出するトンネル掘削土に対する不溶化材の寿命評価
  室井桂介; 橋本綾佳; 中嶋啓太; 有馬孝彦; 五十嵐敏文
  2023年度資源・素材学会北海道支部総会および春季講演会, 10 Jun. 2023
• pH-dependent Solubility of Calcium and Magnesium Released from Adsorbents Mixed with Excavated Rocks
  Ayaka Hashimoto, Sho Hasegawa, Toshitaka Tamura, Seiichi Obana, Takahiko Arima and Toshifumi Igarashi
  The 21st Global Joint Seminar on Geo-Environmental Engineering, 11 May 2023, Oral presentation
• Comparison of Arsenic Leaching Concentration from Excavated Rocks Between Pre-Construction and Construction Phases of Hokkaido Shinkansen
  Keita Nakajima; Takahiro Yamamoto; Takahiko Arima; Toshifumi Igarashi
  The 21st Global Joint Seminar on Geo-Environmental Engineering, 11 May 2023, Oral presentation
• 海外資源国の休廃止鉱山および堆積場周辺の環境問題について
  有馬孝彦
  Webシンポジウム第４回『休廃止鉱山のグリーン・レメディエーションと関連分野の最前線』, 07 Mar. 2023
• Effectiveness of Natural Adsorbents for Fluoride Leaching from Excavated Tuff Breccia Related to Tunnel Construction
  Takahiko Arima; Nohara Yokobori; Mufalo Walubita; Carlito Baltazar Tabelin; Toshifumi Igarashi
  International Conference on Water;From Pollution to;Purification, 11 Feb. 2023, Invited oral presentation
  [Invited]
• 掘削残土に含まれる自然由来重金属等や休廃止鉱山における環境問題の現状について
  有馬孝彦
  令和４年度 第3回 学際的資源開発研究会, 22 Dec. 2022, Oral presentation
• 分級と吸着層工法を併用した高濃度ヒ素含有岩石の処理方法に関する検討
  篠原智志; 石神大輔; 伊藤圭二郎; 上島裕; 有馬孝彦; 五十嵐敏文
  第15回地盤改良シンポジウム, 10 Dec. 2022, Oral presentation
• Hydrogeological characteristics around the Yoshino mine and impacts of its acid mine drainage on the local water resources
  Thaw Dar Wunn; Kenani Malama; Naoto Nishimoto; Takahiko Arima; Takaya Hamai; Singo Tomiyama; Toshifumi Igarashi
  International Workshop on Resource Science and Sustainable Development organized by ICREMER, Akita University, 19 Oct. 2022, English, Poster presentation
• 人工資材を用いた重金属等掘削土対策における新たな寿命評価方法の提案
  橋本 綾佳; 長谷川 翔; 田村 俊孝; 尾花 誠一; 有馬 孝彦; 五十嵐 敏文
  一般社団法人資源・素材学会-2022年度資源・素材関係学協会合同秋季大会（福岡）-, 08 Sep. 2022, Oral presentation
• 幌別硫黄鉱山における坑内水起源と地下水流動の評価
  青塚陽生; 富山眞吾; 有馬孝彦; 五十嵐敏文
  2022 年度（一社）資源・素材学会北海道支部春季講演会, 11 Jun. 2022, Oral presentation
• フライアッシュを用いた CO2鉱物固定化の可能性
  石堂倫太郎、玉村修司、村上拓馬、松本裕之、鈴木良明、伊東義博、有馬孝彦、五十嵐敏文
  2022 年度（一社）資源・素材学会北海道支部春季講演会, 11 Jun. 2022, Oral presentation
• Properties of Rocks around mines in Fiji and Their Leaching Behavior of Toxic Elements
  Yoshihiko Arita; Apete T. Soro; Takahiko Arima; Toshifumi Igarashi
  20th Global Joint Seminar on Geo-Environmental Engineering 2022, 19 May 2022, English, Oral presentation
• Release of calcium ion from fly ash to enhance carbonation
  Rintaro Ishido; Shuji Tamamura; Takuma Murakami; Hiroyuki Matsumoto; Yoshiaki Suzuki; Yoshihiro Ito; Takahiko Arima; Toshifumi Igarashi
  20th Global Joint Seminar on Geo-Environmental Engineering 2022, 19 May 2022, English, Oral presentation
• Evaluation of Acid Mine Drainage sources and flow of groundwater in the Horobetsu sulfur mine
  Haruki Aotsuka; Shingo Tomiyama; Takahiko Arima; Toshifumi Igarashi
  20th Global Joint Seminar on Geo-Environmental Engineering 2022, 19 May 2022, English, Oral presentation
• 天然土質材料の砒素に対する吸着性能評価事例
  有馬 孝彦; 寺口 慧介; 芦田 和久; 高篠 葵
  Webシンポジウム『休廃止鉱山のｸﾞﾘｰﾝ・ﾚﾒﾃﾞｨｴｰｼｮﾝに関わる研究の最前線』, Mar. 2022, Oral presentation
• 重金属等含有掘削ずりから溶出する砒素とセレンの価数に着目した評価手法
  有馬 孝彦; 佐々木 亮介; Carlito Baltazar Tabelin; 田本 修一; 山本 隆広; 五十嵐 敏文
  Webシンポジウム『休廃止鉱山と土壌環境に関わる研究の新たな展開』, Mar. 2021, Oral presentation
• Comparison of Leaching Behavior of Arsenic and Selenium from Mudstone by In Situ and Laboratory Column Experiments
  Takahiko Arima; Ryosuke Sasaki; Carlito Baltazar Tabelin; Shuichi Tamoto; Takahiro Yamamoto; Toshifumi Igarashi
  18th Joint Seminar on Geo-environmental Engineering, Concordia University, Montreal, Canada, May 2019, Oral presentation
• 汚染土壌等の適正利用に関する考え方
  有馬 孝彦; 門倉 伸行; 吉村 雅仁; 門間 聖子; 秦 浩司
  第22回地下水・土壌汚染とその防止対策に関する研究集会, Jun. 2016, Oral presentation
• Combined bottom volcanic-ash adsorption layer and calcium carbonate system for disposing excavated rocks producing acidic leachate with toxic element
  Takahiko Arima; Toshifumi Igarashi; Takeshi Tatsuhara
  10th Joint Seminar on Geo-Environmental Engineering 2011，Kagawa，Japan, May 2011, Oral presentation
• pH制御による岩盤掘削ずりからの重金属類溶出抑制
  有馬 孝彦; 佐藤 大樹; 五十嵐 敏文
  日本応用地質学会研究発表会, Oct. 2010, Oral presentation
• Column adsorption of toxic elements leached from excavated rocks by a bottom volcanic ash layer
  Takahiko Arima; Toshifumi Igarashi; Shuichi Tamoto; Takeshi Tatsuhara
  International Association for Engineering Geology，Auckland，New Zealand, Sep. 2010, Oral presentation
• 吸着層による掘削ずりからの重金属類溶出低減対策
  有馬 孝彦; 五十嵐 敏文; 田本 修一; 龍原 毅
  日本応用地質学会研究発表会, Oct. 2009, Oral presentation
• 吸着層工法を用いた掘削ずりからの重金属類溶出低減対策
  有馬 孝彦; 五十嵐 敏文; 田本 修一; 龍原 毅
  資源素材関係学協会合同秋季大会, Sep. 2009, Poster presentation
• カラム試験を用いた掘削ずりからの重金属類溶出挙動
  有馬 孝彦; 五十嵐 敏文; 田本 修一; 龍原 毅
  資源素材学会北海道支部春季講演会, Jun. 2009, Oral presentation

• 国際フィールド調査, 2024年, 修士課程, 工学院
• 国際人材交流セミナー, 2024年, 修士課程, 工学院
• 大学院共通授業科目（教育プログラム）：One program for Global Goals, 2024年, 修士課程, 大学院共通科目
• 大学院共通授業科目（教育プログラム）：One program for Global Goals, 2024年, 修士課程, 大学院共通科目
• 資源循環システム実験Ⅲ, 2024年, 学士課程, 工学部
• 資源循環システムⅠ, 2024年, 学士課程, 工学部
• 資源循環工学, 2024年, 学士課程, 工学部
• 資源工学概論, 2024年, 学士課程, 工学部
• 地下水工学, 2024年, 学士課程, 工学部

• 資源・素材学会

• 実スケール盛土における自然由来重金属等の溶出・移行機構の解明と環境リスク評価手法への示唆
  研究助成（土木・建築・i-construction分野）
  Apr. 2026 - Mar. 2027
  公益財団法人 前田記念工学振興財団, Principal investigator
• Utilization of hyperspectral imaging for the risk assessment of environmental pollution by heavy metals
  Grants-in-Aid for Scientific Research
  01 Apr. 2024 - 31 Mar. 2026
  有馬 孝彦
  Japan Society for the Promotion of Science, Grant-in-Aid for Early-Career Scientists, Hokkaido University, 24K17345
• ハイパースペクトルイメージと深層学習を用いた汚染土壌判定モデル最適化のための教師データの化学統計的評価
  2024年度研究助成
  Apr. 2025 - Mar. 2026
  公益財団法人大林財団, Principal investigator
• 原地盤による酸性坑廃水のナチュラルアテニュエーション機構の解明
  試験研究助成金
  Apr. 2023 - Mar. 2026
  一般財団法人日本鉱業振興会, Principal investigator
• 汚染土吸着層を用いた自然由来重金属掘削残土への新たな対策手法の確立
  2023年研究助成
  Apr. 2024 - Mar. 2025
  公益財団法人大林財団, Principal investigator
• ハイパースペクトルイメージングを用いた汚染土壌判定に関する研究
  第25回（一財）国土技術研究センター研究開発助成制度
  Apr. 2024 - Mar. 2025
  一般財団法人国土技術研究センター, Principal investigator
• ハイパースペクトルイメージと深層学習を用いた自然由来重金属汚染土壌の現場判定への適用
  令和６年度(2024年度)前田記念工学振興財団 研究助成
  Apr. 2024 - Mar. 2025
  公益財団法人前田記念工学振興財団, Principal investigator
• 清濁分離による坑廃水の発生量低減に関する研究
  令和６年度吉乃鉱山における発生源対策を 見据えた基礎的検討
  Apr. 2024 - Feb. 2025
  独立行政法人エネルギー・金属鉱物資源機構, Principal investigator
• 秋田県吉乃鉱山を対象とした地下水流動系の評価と発生源対策の効果予測に関わる研究
  令和５年度吉乃鉱山における発生源対策を 見据えた基礎的検討
  Apr. 2023 - Feb. 2024
  独立行政法人エネルギー・金属鉱物資源機構, Principal investigator
• 分級・不溶化・吸着層を併用した高濃度自然由来重金属含有土の対策手法の開発
  令和4年度若手研究者研究助成
  Jun. 2023
  一般社団法人 環境地盤工学研究所
• 高空間分解能マルチスペクトル画像を用いた資源探査方法の開発
  Dec. 2022 - Feb. 2023
  独立行政法人エネルギー・金属鉱物資源機構, 金属資源の生産技術に関する基礎研究, Principal investigator
• 秋田県吉乃鉱山を対象とした地下水流動系の評価と発生源対策の効果予測に関わる研究
  Jul. 2022 - Feb. 2023
  独立行政法人エネルギー・金属鉱物資源機構, 令和４年度吉乃鉱山における発生源対策を 見据えた基礎的検討, Principal investigator

• 学問研究ガイダンス
  31 Oct. 2025
  Lecturer
  市立札幌藻岩高等学校
• Sustainable Mining Development for Artisanal Small-Scale Gold Mining (ASGM): From Assessment to Mitigation of Geo-environmental Impact in the Philippines
  08 Sep. 2025
  Planner, Organizing member
  Hokkaido University and Mines and Geosciences Bureau Office

• スーパーコンピュータとAIによるごみ焼却時の撹拌条件の最適化 -熟練オペレーターを代替する実証プロジェクトを開始-
  Apr. 2025
  北海道大学
  [Internet]