Lessons Learned from an Experimental Campaign on Promoting Energy Content of Renewable Biogas by Injecting H 2 during Anaerobic Digestion

Shiplu Sarker, Sander N. Wijnsma and Kristian M. Lien
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Shiplu Sarker: Department of Manufacturing and Civil Engineering, Norwegian University of Science and Technology (NTNU), 2815 Gjøvik, Norway
Sander N. Wijnsma: Department of Chemical Engineering, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway
Kristian M. Lien: Department of Energy and Process Engineering, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway

Energies, 2020, vol. 13, issue 14, 1-10

Abstract: Direct injection of H 2 to an anaerobic reactor enables biological fixation of CO 2 into CH 4 (biomethanation) and consequently boosts methane content in the produced biogas. However, there has been only a small amount of literature reporting results on this technique in a continuous reactor framework to date. To fill this gap, the present study devoted an experimental work to direct H 2 addition to a fed-batch semi-continuous reactor, where the injected H 2 concentration increased gradually (~3–30 mmol), spanning a moderate operational period of about 70 days. As the results revealed, the reactor continued anaerobic operation for each level of H 2 dosing and produced an average methane content in the biogas ranging between 65% and 72%. The exhibited biogas upgrading trend appeared to be under-developed, and thereby suggests the need for further research.

Keywords: biogas; biomethanation; H2 injection; methane content; in situ; upgrading (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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