Biogas and Biohydrogen Production Using Spent Coffee Grounds and Alcohol Production Waste

Liana Vanyan, Adam Cenian and Karen Trchounian ()
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Liana Vanyan: Department of Biochemistry, Microbiology and Biotechnology, Faculty of Biology, Yerevan State University, 1 Alex Manoogian Str., Yerevan 0025, Armenia
Adam Cenian: Institute of Fluid Flow Machinery, Polish Academy of Sciences, Physical Aspects of Ecoenergy Department, Fiszera 14 Street, 80-231 Gdańsk, Poland
Karen Trchounian: Department of Biochemistry, Microbiology and Biotechnology, Faculty of Biology, Yerevan State University, 1 Alex Manoogian Str., Yerevan 0025, Armenia

Energies, 2022, vol. 15, issue 16, 1-11

Abstract: In this study, alternative uses for lignocellulosic waste by considering them a source of eco-friendly and renewable energy generation with the application of the anaerobic digestion of treated and untreated waste for biogas and biohydrogen generation were investigated. The diluted sulfuric acid method was used for both the substrates and inoculum. Hydrogen production was absent when untreated spent coffee grounds (SCG) and alcohol waste (AW) were both used with the inoculum at pH 5.5 and pH 7.5. Meanwhile, the highest biogas yield of 320 dm 3 kg V.S −1 was obtained when using AW at pH 7.5, with a 190 dm 3 kg V.S −1 yield of methane. Instead, hydrogen production was observed when initially 4% ( w / v ) and 6% ( w / v ) SCG-containing hydrolysates were used as the substrates at pH 5.5, yielding 2.9 ± 0.09 dm 3 kg V.S −1 and 3.85 ± 0.12 dm 3 kg V.S −1 , respectively. The further optimization of pretreatment technologies and pH control could lead to increased and prolonged hydrogen production.

Keywords: spent coffee grounds; alcohol waste; biogas; biomethane; biohydrogen (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: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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