Enhancement of Biogas (Methane) Production from Cow Dung Using a Microbial Electrochemical Cell and Molecular Characterization of Isolated Methanogenic Bacteria

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Bhatt, PujaCentral Department of Biotechnology, Tribhuvan University, Kirtipur 44618, Nepal (author)

Enhancement of Biogas (Methane) Production from Cow Dung Using a Microbial Electrochemical Cell and Molecular Characterization of Isolated Methanogenic Bacteria

Article/chapterEnglish2024

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MDPI,2024
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LIBRIS-ID:oai:DiVA.org:ltu-107428
https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-107428URI
https://doi.org/10.3390/biomass4020023DOI

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Language:English
Summary in:English

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Godkänd;2024;Nivå 0;2024-06-14 (joosat);Funder: Tribhuvan University under National Priority Area Research Project (TU-NPAR-077/78-ERG-07);Full text license: CC BY;
Biogas has long been used as a household cooking fuel in many tropical counties, and it has the potential to be a significant energy source beyond household cooking fuel. In this study, we describe the use of low electrical energy input in an anaerobic digestion process using a microbial electrochemical cell (MEC) to promote methane content in biogas at 18, 28, and 37 °C. Although the maximum amount of biogas production was at 37 °C (25 cm3), biogas could be effectively produced at lower temperatures, i.e., 18 (13 cm3) and 28 °C (19 cm3), with an external 2 V power input. The biogas production of 13 cm3 obtained at 18 °C was ~65-fold higher than the biogas produced without an external power supply (0.2 cm3). This was further enhanced by 23% using carbon-nanotubes-treated (CNT) graphite electrodes. This suggests that the MEC can be operated at as low as 18 °C and still produce significant amounts of biogas. The share of CH4 in biogas produced in the controls was 30%, whereas the biogas produced in an MEC had 80% CH4. The MEC effectively reduced COD to 42%, whereas it consumed 98% of reducing sugars. Accordingly, it is a suitable method for waste/manure treatment. Molecular characterization using 16s rRNA sequencing confirmed the presence of methanogenic bacteria, viz., Serratia liquefaciens and Zoballella taiwanensis, in the inoculum used for the fermentation. Consistent with recent studies, we believe that electromethanogenesis will play a significant role in the production of value-added products and improve the management of waste by converting it to energy.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Industriell bioteknik Bioenergi hsv//swe
ENGINEERING AND TECHNOLOGY Industrial Biotechnology Bioenergy hsv//eng
TEKNIK OCH TEKNOLOGIER Naturresursteknik Energisystem hsv//swe
ENGINEERING AND TECHNOLOGY Environmental Engineering Energy Systems hsv//eng
biogas
methanogens
microbial electrochemical cell (MEC)
electromethanogenesis
anaerobic digestion
Biokemisk processteknik
Biochemical Process Engineering

Added entries (persons, corporate bodies, meetings, titles ...)

Poudyal, PranitaCentral Department of Biotechnology, Tribhuvan University, Kirtipur 44618, Nepal (author)
Dhungana, PradipCentral Department of Biotechnology, Tribhuvan University, Kirtipur 44618, Nepal (author)
Prajapati, BikramCentral Department of Biotechnology, Tribhuvan University, Kirtipur 44618, Nepal (author)
Bajracharya, SumanLuleå tekniska universitet,Kemiteknik(Swepub:ltu)bajsum (author)
Yadav, Amar PrasadCentral Department of Chemistry, Tribhuvan University, Kirtipur 44618, Nepal (author)
Bhattarai, TribikramCentral Department of Biotechnology, Tribhuvan University, Kirtipur 44618, Nepal (author)
Sreerama, LakshmaiahCentral Department of Biotechnology, Tribhuvan University, Kirtipur 44618, Nepal; Department of Chemistry and Biochemistry, St. Cloud State University, St. Cloud, MN 56301, USA (author)
Joshi, JarinaCentral Department of Biotechnology, Tribhuvan University, Kirtipur 44618, Nepal (author)
Central Department of Biotechnology, Tribhuvan University, Kirtipur 44618, NepalKemiteknik (creator_code:org_t)

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In:Biomass: MDPI4:2, s. 455-4712673-8783

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ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Industrial Biote ...; and Bioenergy

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