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<p>Carbon-based conductive materials (CMs) were used during the anaerobic digestion of swine wastewater in batch and semi-continuous bioreactors at hydraulic residence times (HRT) of 72h, 144h, and 96h. The graphite felt achieved a maximum methane conversion rate of 93% in the batch bioreactors, which is 2.7, 1.6, 1.5, and 1.5-fold higher than the control, vegetal granular activated carbon (GAC), mineral GAC, and carbon cloth, respectively. Nonetheless, the chemical oxygen demand (COD) removal rate for graphite felt was only 69%. The maximum methane production achieved with graphite felt was associated with high consumption of volatile fatty acids (VFA), particularly acetic acid, which accounted for 76% of total consumption at the end of the cultures. Meanwhile, the graphite felt produced the highest methane yield in the semi-continuous bioreactors, followed by vegetal GAC and the control, across the three HRTs tested. The vegetal GAC achieved a COD removal rate of 62%. The results obtained from scanning electron microscopy, X-ray microanalysis, and infrared spectroscopy suggest that the morphology and chemical composition of the carbon-based CMs significantly affect anaerobic digestion under both bioreactor configurations.</p>

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Improving swine wastewater management: a comparative evaluation of carbon-based materials in batch and semi-continuous anaerobic digesters

  • 期刊论文

  • 发表日期：

    2026年1月21日

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  • M. Orrantia,
  • M. A. Armenta,
  • E. R. Meza-Escalante,
  • V. A. Burboa-Charis,
  • D. Serrano-Palacios,
  • L. H. Alvarez

摘要

Carbon-based conductive materials (CMs) were used during the anaerobic digestion of swine wastewater in batch and semi-continuous bioreactors at hydraulic residence times (HRT) of 72h, 144h, and 96h. The graphite felt achieved a maximum methane conversion rate of 93% in the batch bioreactors, which is 2.7, 1.6, 1.5, and 1.5-fold higher than the control, vegetal granular activated carbon (GAC), mineral GAC, and carbon cloth, respectively. Nonetheless, the chemical oxygen demand (COD) removal rate for graphite felt was only 69%. The maximum methane production achieved with graphite felt was associated with high consumption of volatile fatty acids (VFA), particularly acetic acid, which accounted for 76% of total consumption at the end of the cultures. Meanwhile, the graphite felt produced the highest methane yield in the semi-continuous bioreactors, followed by vegetal GAC and the control, across the three HRTs tested. The vegetal GAC achieved a COD removal rate of 62%. The results obtained from scanning electron microscopy, X-ray microanalysis, and infrared spectroscopy suggest that the morphology and chemical composition of the carbon-based CMs significantly affect anaerobic digestion under both bioreactor configurations.