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Influence of substrates proportion and concentration on biogas composition and yield in the co-digestion of solid and liquid waste from coffee and swine farms

Author

Listed:
  • Lourenço, V.A.
  • Camargo, F.P.
  • Sakamoto, I.K.
  • Silva, E.L.
  • Varesche, M.B.A.

Abstract

The present study aimed to investigate the anaerobic co-digestion of liquid swine manure (LSM), coffee wastewater (CFW) and coffee husk and pulp. The fixed operating conditions of batch reactors were pH 7, 3 g L−1 of coffee pulp and husks, 37 °C and 130 RPM. A single central composite rotational design with two factors was used to evaluate the influence of the CFW percentage (6–54 %, in relation to LSM) and the concentration of dissolved organic matter (OMD) (3–17 gCOD−1). It was observed that lower percentages of CFW (7–13 %) and/or lower concentrations of OMD (3–10 gCOD L−1) results in the production of biogas rich in CH4 without H2. Higher proportions of CFW (30–54 %) with higher OMD concentrations (10–17 gCOD L−1) favored hydrogen production. The highest CH4 yield was verified with 6 % CFW and 3 gCOD L−1 (423.04 mLCH4 g−1VS) in which the COD/N ratio was equal to 32. The main genera identified in the Archaea domain were Methanosaeta sp. (34 %) and Metanolinea sp. (33 %). Regarding hydrogen production, a higher yield was observed with 53 % CFW, 17 gCOD L−1, COD/N ratio of 48 and use of pre-treatment for Archaea inhibition (93.02 mLH2 g−1VS), the main genera identified were Lactobacillus sp. (75 %). The CH4 and H2 production were also evaluated in terms of energetic balance for a coffee and swine farm. Only CH4 production resulted in a positive energy balance and would promote the farm's energy self-sufficiency.

Suggested Citation

  • Lourenço, V.A. & Camargo, F.P. & Sakamoto, I.K. & Silva, E.L. & Varesche, M.B.A., 2025. "Influence of substrates proportion and concentration on biogas composition and yield in the co-digestion of solid and liquid waste from coffee and swine farms," Renewable Energy, Elsevier, vol. 249(C).
    • Handle: RePEc:eee:renene:v:249:y:2025:i:c:s0960148125008535
    DOI: 10.1016/j.renene.2025.123191
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