Enhanced Biomethanation: The Impact of Incorporating Fish Waste on the Co-Digestion of Pig Slurry and Orange Pomace

Joana Silva and Rita Fragoso ()
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Joana Silva: Instituto Superior de Agronomia (ISA), University of Lisbon, Tapada da Ajuda, 1349-017 Lisbon, Portugal
Rita Fragoso: LEAF—Linking Landscape, Environment, Agriculture and Food, Associated Laboratory TERRA, Instituto Superior de Agronomia (ISA), University of Lisbon, Tapada da Ajuda, 1349-017 Lisbon, Portugal

Energies, 2023, vol. 16, issue 16, 1-14

Abstract: Anaerobic digestion technology can play a significant role in the transition to a low-carbon and circular economy by producing bioenergy (biomethane) and organic fertilizer (digestate). This study proposes a valorization approach for three waste streams widely produced in the Mediterranean area: fish waste (FW), pig slurry (PS), and orange pomace (OP). The FW lipid content can enhance biomethane yield as long as inhibition by long-chain fatty acids is prevented. In this study, the effect of introducing 25% and 50% FW to the anaerobic co-digestion of a reference mixture consisting of 80% PS and 20% OP pulp (OPP) was studied. Co-digestion using 50% FW presented the maximum biomethane yield (669.68 ± 8.32 mL CH 4 /g VS added ), which corresponds to a 37% increase compared to the reference. No inhibition was detected during the anaerobic digestion assay. The kinetic study showed that the introduction of FW led to a reduction in the degradation rate constant by up to 30%. The lag phase increased as FW content increased, with 50% FW presenting a lag time approximately three times that of the reference mixture. The proposed strategy can encourage sustainable waste management practices and contribute to GHG emissions mitigation.

Keywords: bioenergy; biomethane; degradation constant; lag time; lipids content (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: 2023
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