Biomethane enhancement using reduced graphene oxide in anaerobic digestion of municipal solid waste

Hamdi Muratçobanoğlu; Öznur Begüm Gökçek; Fatma Muratçobanoğlu; Ruhullah Ali Mert; Sevgi Demirel

doi:10.1016/j.biortech.2022.127163

Biomethane enhancement using reduced graphene oxide in anaerobic digestion of municipal solid waste

Bioresour Technol. 2022 Jun:354:127163. doi: 10.1016/j.biortech.2022.127163. Epub 2022 Apr 13.

Authors

Hamdi Muratçobanoğlu¹, Öznur Begüm Gökçek², Fatma Muratçobanoğlu³, Ruhullah Ali Mert⁴, Sevgi Demirel²

Affiliations

¹ Department of Environmental Engineering, Nigde Omer Halisdemir University, Nigde 51240, Turkey. Electronic address: hamdi.murat@ohu.edu.tr.
² Department of Environmental Engineering, Nigde Omer Halisdemir University, Nigde 51240, Turkey; Department of Energy Science and Technologies, Nigde Omer Halisdemir University, Nigde 51240, Turkey.
³ Department of Environmental Engineering, Erciyes University, Kayseri 38039, Turkey.
⁴ Department of Environmental Engineering, Nigde Omer Halisdemir University, Nigde 51240, Turkey.

PMID: 35429595
DOI: 10.1016/j.biortech.2022.127163

Abstract

The present research investigated the impact of reduced graphene oxide (rGO) addition on the semi-continuous anaerobic digestion of the organic fraction of municipal solid waste (OFMSW) in the range of 0.5-10 gVolatileSolid(VS)/L_reactorday organic loading rates (OLR). Adding rGO enhanced the rate and yield of biomethane production, and the maximum biomethane increment rate was obtained as 110% at an OLR of 4.0 gVS/L_reactorday. However, after increasing the OLR to 6 gVS/L_reactorday, there was a dramatic decrease in biomethane production because of volatile fatty acid (VFA) accumulation. Methanotrix is the predominant archaeal genus at OLRs lower than 6 gVS/L_reactorday in reactors (89-97%). An increment in biomethane production was associated with the higher abundance of the Methanothrix genus in the rGO-supported reactor (rG) than in the control reactor (rC).

Keywords: Biogas; Conductive material; Direct interspecies electron transfer; Waste management.

MeSH terms

Anaerobiosis
Biofuels / analysis
Bioreactors
Graphite
Methane
Refuse Disposal*
Solid Waste* / analysis

Substances

Biofuels
Solid Waste
graphene oxide
Graphite
Methane