Anaerobic co-digestion of oil-extracted spent coffee grounds with various wastes: Experimental and kinetic modeling studies

M R Atelge; A E Atabani; Serdar Abut; M Kaya; Cigdem Eskicioglu; Georgeio Semaan; Changsoo Lee; Y Ş Yildiz; S Unalan; R Mohanasundaram; F Duman; Gopalakrishnan Kumar

doi:10.1016/j.biortech.2020.124470

Anaerobic co-digestion of oil-extracted spent coffee grounds with various wastes: Experimental and kinetic modeling studies

Bioresour Technol. 2021 Feb:322:124470. doi: 10.1016/j.biortech.2020.124470. Epub 2020 Dec 3.

Authors

M R Atelge¹, A E Atabani², Serdar Abut³, M Kaya⁴, Cigdem Eskicioglu⁵, Georgeio Semaan⁶, Changsoo Lee⁷, Y Ş Yildiz⁸, S Unalan², R Mohanasundaram⁹, F Duman¹⁰, Gopalakrishnan Kumar⁶

Affiliations

¹ Alternative Fuels Research Laboratory (AFRL), Energy Division, Department of Mechanical Engineering, Faculty of Engineering, Erciyes University, 38039 Kayseri, Turkey; Department of Mechanical Engineering, Faculty of Engineering, Siirt University, 56100 Siirt, Turkey. Electronic address: rasitatelge@gmail.com.
² Alternative Fuels Research Laboratory (AFRL), Energy Division, Department of Mechanical Engineering, Faculty of Engineering, Erciyes University, 38039 Kayseri, Turkey.
³ Department of Computer Education and Instructional Technology, Siirt University, 56100 Siirt, Turkey.
⁴ Faculty of Engineering, Department of Chemical Engineering, Siirt University, 56100 Siirt, Turkey.
⁵ UBC Bioreactor Technology Group, School of Engineering, The University of British Columbia, Okanagan Campus, 3333 University Way, Kelowna, BC V1V 1V7, Canada.
⁶ Institute of Chemistry, Bioscience and Environmental Engineering, Faculty of Science and Technology, University of Stavanger, Box 8600 Forus, 4036 Stavanger, Norway.
⁷ School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan 44919, Republic of Korea.
⁸ Department of Environmental Engineering, Faculty of Engineering, Erciyes University, 38039 Kayseri, Turkey.
⁹ School of Computer Science and Engineering, VIT University, India.
¹⁰ Department of Biology, Faculty of Science, Erciyes University, 38039 Kayseri, Turkey.

PMID: 33338944
DOI: 10.1016/j.biortech.2020.124470

Abstract

The effect of oil extraction from spent coffee grounds as a pre-treatment strategy prior to anaerobic digestion besides assessing the feasibility of defatted spent coffee grounds co-digestion with spent tea waste, glycerin, and macroalgae were examined. Mesophilic BMP tests were performed using defatted spent coffee grounds alongside four co-substrates in the ratio of 25, 50, and 75%, respectively. The highest methane yield was obtained with the mono-digestion of defatted spent coffee grounds with 336 ± 7 mL CH₄/g VS and the yield increased with the increase in the mass ratio of defatted spent coffee grounds during co-digestion. Moreover, defatted spent coffee grounds showed the highest VS and TS removal at 35.5% and 32.1%, respectively and decreased thereafter. Finally, a linear regression model for the interaction effects between substrates was demonstrated and showed that distinctly mixing defatted spent coffee grounds, spent coffee grounds, and spent tea waste outperforms other triple mixed substrates.

Keywords: Anaerobic digestion; Biofuels; Defatted spent coffee grounds; Kinetic study; Oil extraction.

MeSH terms

Anaerobiosis
Biofuels
Coffee*
Digestion
Kinetics
Methane*

Substances

Biofuels
Coffee
Methane