•  
  •  
 

Author ORCID Identifier

AKM Badrul Alam: 0000-0002-6137-2858

Noritaka Aramaki: 0000-0002-8869-3555

Shuji Tamamura: 0000-0002-0337-4134

Akio Ueno: 0000-0001-6332-2232

Takuma Murakami: 0009-0001-9044-6983

Yoshiaki Fujii: 0000-0003-0431-4093

Katsuhiko Kaneko: 0009-0005-0312-250X

Abstract

The lignite resource has been under consideration for the subsurface cultivation and gasification (SCG) method to produce biomethane from lignite in Hokkaido, Japan. The primary phase of the method entails initiating the oxidative transformation of lignite using an H2O2 solution, resulting in the formation of dissolved organic carbon (DOC), a pivotal component. To examine the effects of induced oxidation on lignite's mechanical properties, artificial oxidation tests were conducted to form DOC. While there was a slight decrease in P-wave velocity and density, the uniaxial compression and indirect tensile strengths, as well as stiffness, did not decrease. These results were obtained at room temperature and atmospheric pressure. Therefore, further examination of the results under pore and confining pressures and at a higher temperature is necessary. However, it is expected that a significant strength decrease due to H2O2 oxidation would not need to be considered in the SCG method. This would lead to a reasonable design of the SCG site, saving time and costs. Moreover, DOC, strengths, and Young’s modulus showed positive correlations with P-wave velocity. Its measurement could be an effective tool for designing the site and predicting the performance of the SCG method.

Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Download

Share

COinS