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<p>Anaerobic co-digestion allows one to treat multiple substrates simultaneously, improving process stability and increasing methane production. The aim of this study was to investigate the solid-state anaerobic co-digestion of cow manure with sugarcane molasses. For this study, mixtures of cow manure and sugarcane molasses were tested in the following ratios: 100/0, 90/10, 80/20, 70/30, 60/40, 50/50, 40/60, 30/70, 20/80, 10/90, and 0/100%w/w. The 90/10%w/w mixture produced the most methane, with a yield of 294.09&#xa0;mL CH<sub>4</sub>/g volatile solids, attributed to the fact that it maintained the buffering capacity of the medium favoring the production of methane. The gradual increase in the sugarcane molasses concentration from the 60/40%w/w mixture to the 0/100%w/w mixture favoured the accumulation of volatile fatty acids, which negatively affected the digestion process, denoted by the lowest methane yield for the 100/0%w/w mixture (0.98&#xa0;mL CH<sub>4</sub>/g volatile solids). The correct fit of the modified Gompertz model (with R<sup>2</sup> values in the range of 0.92 to 0.99) to the experimentally data demonstrated its reliability in predicting the dynamics of methane production. The best operating conditions obtained from this research could represent an alternative for large-scale energy production and the recovery of polluting agro-industrial waste.</p> Graphical Abstract <p></p>

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Methane Production by Co-digestion of Sugarcane Molasses and Cow Manure under Solid-State Anaerobic Digestion

  • 期刊论文

  • 发表日期：

    2026年2月27日

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  • Sergio Cisneros de la Cueva,
  • Francisco Javier Zavala Díaz de la Serna,
  • Ivan Salmerón,
  • Laura Alicia Paniagua,
  • Roberto Valencia Vázquez,
  • Rosario Peralta Peréz

摘要

Anaerobic co-digestion allows one to treat multiple substrates simultaneously, improving process stability and increasing methane production. The aim of this study was to investigate the solid-state anaerobic co-digestion of cow manure with sugarcane molasses. For this study, mixtures of cow manure and sugarcane molasses were tested in the following ratios: 100/0, 90/10, 80/20, 70/30, 60/40, 50/50, 40/60, 30/70, 20/80, 10/90, and 0/100%w/w. The 90/10%w/w mixture produced the most methane, with a yield of 294.09 mL CH4/g volatile solids, attributed to the fact that it maintained the buffering capacity of the medium favoring the production of methane. The gradual increase in the sugarcane molasses concentration from the 60/40%w/w mixture to the 0/100%w/w mixture favoured the accumulation of volatile fatty acids, which negatively affected the digestion process, denoted by the lowest methane yield for the 100/0%w/w mixture (0.98 mL CH4/g volatile solids). The correct fit of the modified Gompertz model (with R2 values in the range of 0.92 to 0.99) to the experimentally data demonstrated its reliability in predicting the dynamics of methane production. The best operating conditions obtained from this research could represent an alternative for large-scale energy production and the recovery of polluting agro-industrial waste.

Graphical Abstract