資源開発技術・開発機械（Mining technologies , Mining and underground construction machineries）

[1308-15-04] Biogenic Methane Generation from Lignite using Hydrogen Peroxide Solution in A Column Experiment

○Shofa Rijalul Haq¹, Shuji Tamamura², Akio Ueno², Satoshi Tamazawa², Takuma Murakami², Noritaka Aramaki², AKM Badrul Alam², Toshifumi Igarashi¹, Katsuhiko Kaneko² (1. Hokkaido University, 2. Horonobe Research Institute for the Subsurface Environment)

司会：羽柴公博（東京大学）
Chairman: Kimihiro Hashiba (University of Tokyo)

キーワード：Lignite, Hydrogen peroxide, Column experiments, Organic acids, Microbially enhanced coalbed methane (MECBM)

Accelerated microbial transformation of coal into biogenic methane (CH₄) is arousing interest globally after the reaction of the coal with hydrogen peroxide (H₂O₂), potentially contributing to "microbially enhanced coal bed methane (MECBM)". To evaluate the enhanced bioavailability of the coal, we investigated the effect of H₂O₂ solution on lignite in column experiments at different concentrations (0.3 and 3% H₂O₂) and flow rates (10 and 100 ml/day). The results showed that the highest dissolved organic carbon (the maximum 6,330 mg/l) and organic acids (i.e., acetic acid and formic acid, the maximum 612 and 1,810 mg/l, respectively) in the effluent solution of 3% H₂O₂-low flow rate (10 ml/day) were observed. Cultivation experiments of methanogens associated with lignite using 0.3% H₂O₂ solution showed the production of methane by methanogens at the concentration of 63.7 and 278 m³ CH₄ per ton lignite after 18 and 35 days, respectively. These indicated the enhancement of the in-situ biogenic methane from chemically-solubilized lignite.