Optimization of In-situ Biogas Up-gradation by CO2-to-CH4 Bioconversion in Two Stage Attached Growth Reactor | [First International Conference on Revamped Scientific Outlook of 21st Century (Abstract Book) • 2022]

Author(s):

1. Waqar Ali Shah: Department of Microbiology, Quaid-i-Azam University,Islamabad,Pakistan

2. Alam Khan: Department of Microbiology, Quaid-i-Azam University,Islamabad,Pakistan

3. Hamayat Ullah: Department of Microbiology, Quaid-i-Azam University,Islamabad,Pakistan

4. Malik Badshah: Department of Microbiology, Quaid-i-Azam University,Islamabad,Pakistan

Abstract:

Biogas is customarily utilized for cooking and heating due to its low energy output, to be exploited as vehicle fuel and power generation up-grading is impulses. The biological in-situ biogas up-gradation with gasses recirculation and H2 from external source, the hydrogenotrophic methanogens transforms CO2 and H2 into CH4 preserving surge in CH4 formed during anaerobic digestion process. The efficiency of up-gradation depends upon the proportion of hydrogenotrophic methanogens which tends to form biofilm. The biofilm in methanogenic reactor will increase the hydrogenotrophic methanogens in reactor resulting high rate up-gradation. The present study looked into the impact of biofilm in methanogenic reactor during in-situ biogas up-gradation. For biogas up-gradation, the gasses were recirculated along with hydrogen supply form the external source in attached growth and suspended growth methanogenic reactor. The flow rate and recirculation time were optimized to boost the efficacy of in-situ up-gradation process. Without up-gradation the methane yield was recorded 0.223 and 0.241 NL g-1VSaddedin case of suspended and attached growth methanogenic reactor. While during up-gradation the methane yield was increased to 0.663 and 0.733 NL g-1VS added in suspended growth and attached growth methanogenic reactor at optimum flow rate and recirculation time. The methane contents of biogas were increased from 71 to 99% in optimized conditions without compromising the process stability. During in-situ biogas up-gradation the biofilm in methanogenic reactor increased the methane production by 11% as compared to control. The study concludes that the inclusion of biofilm in methanogenic reactor showed significant impact on the efficiency of the reactor during in-situ biogas up-gradation.

Page(s): 0-0

DOI: DOI not available

Published: Journal: First International Conference on Revamped Scientific Outlook of 21st Century (Abstract Book), Volume: 0, Issue: 0, Year: 2022

Keywords:

Methane , biofilm , Methanogenic reactor , Biogas upgradation

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