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<p>This study evaluates the biogas potential of unconventional agro-industrial residues from the Colombian Orinoquía region as co-substrates for anaerobic co-digestion with swine manure. The substrates included Sacha Inchi (<i>Plukenetia volubilis</i>) seed and husk, Cacay shell (<i>Cariodendron orinocense</i>), and cassava processing wastewater (<i>Manihot esculenta</i>). Batch anaerobic digestion assays were conducted under mesophilic conditions (37&#xa0;°C) following VDI 4630 guidelines to determine specific biogas yields expressed per unit of volatile solids (VS). Solid residues exhibited high total solids (&gt; 89% TS) and volatile solids content (64–83% of TS), resulting in biogas yields ranging from 300 to 400&#xa0;m³ ton⁻¹ VS. Methane concentrations varied between 59 and 62%, comparable to conventional lignocellulosic agricultural residues widely used in European biogas systems. Elemental analysis revealed elevated C/N ratios (38–175), indicating nitrogen limitation and the necessity of co-digestion with nitrogen-rich substrates to enhance methanogenic performance.</p><p>The results demonstrate that these region-specific agro-industrial residues have a competitive energy potential compared with traditional energy crops. Their integration into rural biodigestion systems represents a technically viable strategy to increase methane production, improve waste management, and promote decentralized renewable energy generation in tropical agricultural regions.</p>

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Biogas potential of different unconventional substrates from the Orinoquía region, Colombia, for anaerobic co-digestion with swine manure

  • 期刊论文

  • 发表日期：

    2026年7月24日

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  • Christian Jose Rojas Reina,
  • Leonardo Alonso-Gomez,
  • Alberto Cortes Santos

摘要

This study evaluates the biogas potential of unconventional agro-industrial residues from the Colombian Orinoquía region as co-substrates for anaerobic co-digestion with swine manure. The substrates included Sacha Inchi (Plukenetia volubilis) seed and husk, Cacay shell (Cariodendron orinocense), and cassava processing wastewater (Manihot esculenta). Batch anaerobic digestion assays were conducted under mesophilic conditions (37 °C) following VDI 4630 guidelines to determine specific biogas yields expressed per unit of volatile solids (VS). Solid residues exhibited high total solids (> 89% TS) and volatile solids content (64–83% of TS), resulting in biogas yields ranging from 300 to 400 m³ ton⁻¹ VS. Methane concentrations varied between 59 and 62%, comparable to conventional lignocellulosic agricultural residues widely used in European biogas systems. Elemental analysis revealed elevated C/N ratios (38–175), indicating nitrogen limitation and the necessity of co-digestion with nitrogen-rich substrates to enhance methanogenic performance.

The results demonstrate that these region-specific agro-industrial residues have a competitive energy potential compared with traditional energy crops. Their integration into rural biodigestion systems represents a technically viable strategy to increase methane production, improve waste management, and promote decentralized renewable energy generation in tropical agricultural regions.