Optimization of biogenic methane production from coal
- Univ. of Utah, Salt Lake City, UT (United States). Dept. of Chemical Engineering
- Univ. of Utah, Salt Lake City, UT (United States). Dept. of Chemical Engineering; Energy and Geoscience Inst., Salt Lake City, UT (United States)
- Inotec Inc., Salt Lake City, UT (United States)
- Univ. of Utah, Salt Lake City, UT (United States). Dept. of Materials Science Engineering
Given continuously increasing global energy needs, diversified efforts have been made to find and exploit new natural gas resources. These include coalbed methane (CBM), which represents an important global, unconventional source of natural gas. Efforts have been underway for some time to more effectively generate methane in-situ in coal plays by introduction of nutrients and/or microbial consortia. However, much is still to be learned about the limitations and environmental conditions that support microbial growth and are conducive to biogenic methane production from coal. Here we evaluated environmental conditions that led to increased methane production from subbituminous coal by introducing a foreign methanogenic consortium that included Methanobacterium sp. Furthermore, we used a central composite design (CCD) to explore a broad range of operational conditions, examine the effects of the important environmental factors, such as temperature, pH and salt concentration, and query a feasible region of operation to maximize methane production from coal. An anticipated detrimental effect of NaCl concentration on methane production was observed for the consortium assessed. The range of feasible operational conditions comprised initial pH values between 4.2 and 6.8, temperatures between 23 °C and 37 °C, and NaCl concentrations between 3.7 mg/cm3 and 9.0 mg/cm3. Coal biogasification was optimal for this consortium at an initial pH value of 5.5, at 30 °C, and at a NaCl concentration 3.7 mg/cm3 (i.e., 145,165 ppm, which is 25.6 sft3/ton).
- Research Organization:
- Univ. of Utah, Salt Lake City, UT (United States)
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE)
- Grant/Contract Number:
- FE0024088
- OSTI ID:
- 1415144
- Alternate ID(s):
- OSTI ID: 1549275
- Journal Information:
- International Journal of Coal Geology, Vol. 183, Issue C; ISSN 0166-5162
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Bioelectrochemical Enhancement of Biogenic Methane Conversion of Coal
|
journal | September 2018 |
Contribution of Yeast Extract, Activated Carbon, and an Electrostatic Field to Interspecies Electron Transfer for the Bioelectrochemical Conversion of Coal to Methane
|
journal | October 2019 |
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