Noriaki Watanabe
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View article: Enhancing permeability in deep, medium-temperature granitic geothermal systems via chelating agent stimulation
Enhancing permeability in deep, medium-temperature granitic geothermal systems via chelating agent stimulation Open
View article: Converting woody biomass ash and CO2 into valuable resources via a sustainable chelation approach
Converting woody biomass ash and CO2 into valuable resources via a sustainable chelation approach Open
View article: Biobased biodegradable chelating agents enhance coupled ex situ and in situ carbon dioxide mineralization via peridotite dissolution and wormholing
Biobased biodegradable chelating agents enhance coupled ex situ and in situ carbon dioxide mineralization via peridotite dissolution and wormholing Open
Mantle peridotite, which is also present in near-surface environments, reacts readily with CO 2 , and is expected to be suitable for CO 2 mineralization. However, the low permeability and porosity of mantle peridotite, in addition to its v…
View article: Imaging 3D Printed Fracture Networks under Stress using X-Ray Computed Tomography
Imaging 3D Printed Fracture Networks under Stress using X-Ray Computed Tomography Open
View article: Unlocking geothermal potential: Activating calcite-filled veins using chelating agents to improve granitic rock permeability
Unlocking geothermal potential: Activating calcite-filled veins using chelating agents to improve granitic rock permeability Open
View article: Tensile Strength of Ultrafine-Grained Cemented Carbide Containing Ti(C,N)
Tensile Strength of Ultrafine-Grained Cemented Carbide Containing Ti(C,N) Open
View article: Tensile Strength of WC-Ti(C,N)-Cr<sub>3</sub>C<sub>2</sub>-Co Ultrafine-Grained Cemented Carbide
Tensile Strength of WC-Ti(C,N)-Cr<sub>3</sub>C<sub>2</sub>-Co Ultrafine-Grained Cemented Carbide Open
View article: Evaluation of retardation effect for the migration of cesium under unsaturated conditions
Evaluation of retardation effect for the migration of cesium under unsaturated conditions Open
This study discussed the migration of cesium (Cs) ions through porous media under unsaturated conditions in the shallow subsurface for the disposal of low-level radioactive waste. In the flow experiments, the column was packed with sand pa…
View article: Development of WC-Ti(C,N)-Cr<sub>3</sub>C<sub>2</sub>-Ni Ultrafine-grained Cemented Carbide and Evaluation of Mechanical Properties
Development of WC-Ti(C,N)-Cr<sub>3</sub>C<sub>2</sub>-Ni Ultrafine-grained Cemented Carbide and Evaluation of Mechanical Properties Open
View article: Synergized Effects of Amino Acids and NaCl to Enhance Silicate Mineral Dissolution in Aqueous Environments for Efficient Atmospheric CO<sub>2</sub> Removal
Synergized Effects of Amino Acids and NaCl to Enhance Silicate Mineral Dissolution in Aqueous Environments for Efficient Atmospheric CO<sub>2</sub> Removal Open
Enhanced weathering of silicate minerals is a promising approach for reducing atmospheric CO2 levels by increasing the aquatic pH and facilitating CO2 dissolution. However, the slow and unsustainable dissolution of si…
View article: Applicability of monitoring data of mercury soil–atmosphere transport in an old mining area for exposure risk assessment
Applicability of monitoring data of mercury soil–atmosphere transport in an old mining area for exposure risk assessment Open
Mercury (Hg) is a widespread pollutant that poses significant risks to both ecosystems and human health. While previous studies have evaluated Hg concentrations in soils, few have measured Hg emissions in areas with high Hg concentrations …
View article: CO <sub>2</sub> capture, geological storage, and mineralization using biobased biodegradable chelating agents and seawater
CO <sub>2</sub> capture, geological storage, and mineralization using biobased biodegradable chelating agents and seawater Open
Geological storage and mineralization of CO 2 in mafic/ultramafic reservoirs faces challenges including limited effective porosity, permeability, and rock reactivity; difficulties in using seawater for CO 2 capture; and uncontrolled carbon…
View article: Tensile Strength of WC-Ti(C,N)-Cr<sub>3</sub>C<sub>2</sub>-Co Ultrafine-grained Cemented Carbide
Tensile Strength of WC-Ti(C,N)-Cr<sub>3</sub>C<sub>2</sub>-Co Ultrafine-grained Cemented Carbide Open
View article: Characteristics and effectiveness of water-assisted CO2 fracturing for creating geothermal reservoirs in volcanic rocks
Characteristics and effectiveness of water-assisted CO2 fracturing for creating geothermal reservoirs in volcanic rocks Open
View article: CO2 fracturing of volcanic rocks under geothermal conditions: Characteristics and process
CO2 fracturing of volcanic rocks under geothermal conditions: Characteristics and process Open
An enhanced geothermal system using carbon dioxide (CO2) for both reservoir creation and thermal energy extraction has attracted attention; however, studies on the CO2 fracturing of volcanic rocks under geothermal conditions are lacking. T…
View article: A sustainable temperature-swing process for CO2 capture and mineralization at below 100 °C using a recyclable chelating agent and bottom ash
A sustainable temperature-swing process for CO2 capture and mineralization at below 100 °C using a recyclable chelating agent and bottom ash Open
Industrial waste utilization for carbon dioxide (CO2) mineralization offers a highly promising approach to significantly reduce CO2 emissions; however, it faces the challenge of consumption of huge amounts of chemicals without their recove…
View article: Maximizing permeability of fractured volcanic rocks through chelating-agent-assisted and pH-controlled selective mineral dissolution
Maximizing permeability of fractured volcanic rocks through chelating-agent-assisted and pH-controlled selective mineral dissolution Open
Chemical stimulation of geothermal reservoirs through mineral dissolution using environmentally friendly chelating agents has been suggested as a new method to complement hydraulic stimulation. However, the permeability enhancement mechani…
View article: Reactivity and Dissolution Characteristics of Naturally Altered Basalt in CO<sub>2</sub>-Rich Brine: Implications for CO<sub>2</sub> Mineralization
Reactivity and Dissolution Characteristics of Naturally Altered Basalt in CO<sub>2</sub>-Rich Brine: Implications for CO<sub>2</sub> Mineralization Open
Hydrothermally altered basaltic rocks are widely distributed and more accessible than fresh basaltic rocks, making them attractive feedstocks for permanent CO2 storage through mineralization. This study investigates the reactivi…
View article: Multi-layered physical factors govern mercury release from soil: Implications for predicting the environmental fate of mercury
Multi-layered physical factors govern mercury release from soil: Implications for predicting the environmental fate of mercury Open
Despite the recognised risks of human exposure to mercury (Hg), the drivers of gaseous elemental mercury (GEM) emissions from the soil remain understudied. In this study, we aimed to identify the environmental parameters that affect the GE…
View article: Creating Multidirectional Fractures Through Particle Jamming
Creating Multidirectional Fractures Through Particle Jamming Open
View article: Clarification of generation mechanism of volatilization flux based on detailed analysis of transport phenomena near the ground surface and quantitative evaluation of influencing factors
Clarification of generation mechanism of volatilization flux based on detailed analysis of transport phenomena near the ground surface and quantitative evaluation of influencing factors Open
Assessing human health risks associated with inhalation exposure of volatile chemical substances (VCSs) volatilized from contaminated soil requires quantitative evaluation of volatilization fluxes (VFs) and an understanding of how environm…
View article: Permeability enhancement by CO2 injection and chelating agent stimulation for creating geothermal reservoirs in granite
Permeability enhancement by CO2 injection and chelating agent stimulation for creating geothermal reservoirs in granite Open
Existing research indicates that to create geothermal reservoirs using CO2 injection, additional stimulation methods are necessary. N, N-bis(carboxymethyl)-L-glutamic acid (GLDA) injection has been predicted to increase the permeability of…
View article: Machine Learning-based Geochemical Discrimination Method for Tsunami Deposits and a Simple Determination System
Machine Learning-based Geochemical Discrimination Method for Tsunami Deposits and a Simple Determination System Open
In order to establish a discrimination method for tsunami deposits, a machine learning analysis is conducted for geochemical data to determine paleo-tsunami deposits. Column samples containing tsunami deposits are collected at Noda village…
View article: Cooling-induced permeability enhancement for networks of microfractures in superhot geothermal environments
Cooling-induced permeability enhancement for networks of microfractures in superhot geothermal environments Open
Recent researches have proposed the use of enhanced geothermal system reservoirs consisting of dense networks of microfractures, created by hydraulic and/or thermal fracturing in superhot/supercritical geothermal environments, because of t…
View article: Shear-slip and Complex Fracturing by CO2 Injection in Naturally Fractured Granite at Geothermal Conditions
Shear-slip and Complex Fracturing by CO2 Injection in Naturally Fractured Granite at Geothermal Conditions Open
Previous studies showed that cloud-fracture networks (CFNs), networks of permeable microfractures densely distributed over rock body, formed in granite at superhot geothermal conditions (> ~400 °C) through the stimulation of pre-exist…
View article: pH dependence of mineral dissolution and permeability enhancement of intermediate to basic volcanic rocks by chelating agent flooding under geothermal conditions
pH dependence of mineral dissolution and permeability enhancement of intermediate to basic volcanic rocks by chelating agent flooding under geothermal conditions Open
The use of Enhanced Geothermal Systems (EGS) has been recognized as a viable source of renewable energy in regions with high geothermal temperatures. Nevertheless, geothermal reservoirs may experience reduced permeability during exploratio…
View article: Multi-layered physical parameters govern mercury release from soil, its fate and potential for human health and ecological risk
Multi-layered physical parameters govern mercury release from soil, its fate and potential for human health and ecological risk Open
Global mercury (Hg) management is an important issue for regulators and regional stakeholders, especially since the entry into force of the Minamata Convention in 2017. Although Hg has been used widely in pharmaceutical and industrial prod…
View article: Prediction of 1,4-Dioxane Migration in Groundwater and Evaluation of Remediation Measures in an Illegal Dumping Site Using a 2D-Numerical Model
Prediction of 1,4-Dioxane Migration in Groundwater and Evaluation of Remediation Measures in an Illegal Dumping Site Using a 2D-Numerical Model Open
Illegal dumping sites are usually characterized by complex contamination situations due to the presence of multiple contamination sources. To improve the efficiency of illegal waste dumping site remediation, this study developed a numerica…
View article: NaHCO3 as a carrier of CO2 and its enhancement effect on mineralization during hydrothermal alteration of basalt
NaHCO3 as a carrier of CO2 and its enhancement effect on mineralization during hydrothermal alteration of basalt Open
Reaction of carbon dioxide (CO 2 ) with minerals to generate stable carbonates, also known as CO 2 mineralization, has been regarded as one of the most promising methods for safe and permanent carbon storage. As a promising feedstock, basa…
View article: Process and optimum pH for permeability enhancement of fractured granite through selective mineral dissolution by chelating agent flooding
Process and optimum pH for permeability enhancement of fractured granite through selective mineral dissolution by chelating agent flooding Open
Chemical stimulation of geothermal reservoirs via selective mineral dissolution with eco-friendly chelating agents has been recently proposed as a novel method complementary to hydraulic stimulation. In our previous study, we demonstrated …