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Abstract <p>This study investigated the energy recovery potential of fruit and vegetable wastes (FVWs) from the Pernambuco Supply and Logistics Center (CEASA-PE) through anaerobic digestion (AD), aiming to increase biomethane production by using different inoculum mixtures and recirculating stabilized liquid biofertilizer (BIO). Combinations of digestate (R3), cattle rumen content (RU), and sewage sludge (SS) were tested using a mixture experimental design based on the simplex-centroid method and response surface methodology, which allowed us to systematically evaluate the interactions between the inocula and identify optimal proportions to produce biomethane. The experiments were conducted in an Automatic Methane Potential Test System (AMPTS II) under mesophilic conditions, with an inoculum-to-substrate ratio of 2:1 on a volatile solids (VS) basis and an organic load of 3.0384&#xa0;g VS. The combination of 25% BIO and 75% RU provided the highest biomethane yield, reaching 453.1 NmL/g VS, approximately four times higher than the positive control. The mixture of 25% BIO and 75% R3 resulted in 256.7 NmL/g VS, about 2.5 times the control. The first-order and modified Gompertz kinetic models showed good agreement with the experimental data. In addition, the statistical modeling revealed that the special cubic model obtained the best fit (<i>R</i><sup>2</sup> ~0.98, <i>E</i><sub>RMSE</sub> ~8.07 NmL/g VS), demonstrating significant synergistic effects between the components. Additionally, based on the amount of FVW generated at CEASA-PE, a deterministic analysis of potential generation of 124 MWh per month in electricity was performed. The probabilistic analysis via Monte Carlo simulation estimated an electricity generation potential of approximately 1.0 GWh/a for CEASA-PE. The results confirm the technical and energetic viability of using optimized inoculum mixtures for the valorization of urban organic waste in decentralized systems.</p> Graphical abstract <p></p>

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Improving biomethane production from co-digestion of fruit and vegetable waste through inoculum mixtures and recirculation of liquid biofertilizer

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月15日

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  • Daniela dos Santos Santana,
  • Jonathan da Cunha Teixeira,
  • Maria Odete Holanda Mariano,
  • José Fernando Thome Jucá

摘要

Abstract

This study investigated the energy recovery potential of fruit and vegetable wastes (FVWs) from the Pernambuco Supply and Logistics Center (CEASA-PE) through anaerobic digestion (AD), aiming to increase biomethane production by using different inoculum mixtures and recirculating stabilized liquid biofertilizer (BIO). Combinations of digestate (R3), cattle rumen content (RU), and sewage sludge (SS) were tested using a mixture experimental design based on the simplex-centroid method and response surface methodology, which allowed us to systematically evaluate the interactions between the inocula and identify optimal proportions to produce biomethane. The experiments were conducted in an Automatic Methane Potential Test System (AMPTS II) under mesophilic conditions, with an inoculum-to-substrate ratio of 2:1 on a volatile solids (VS) basis and an organic load of 3.0384 g VS. The combination of 25% BIO and 75% RU provided the highest biomethane yield, reaching 453.1 NmL/g VS, approximately four times higher than the positive control. The mixture of 25% BIO and 75% R3 resulted in 256.7 NmL/g VS, about 2.5 times the control. The first-order and modified Gompertz kinetic models showed good agreement with the experimental data. In addition, the statistical modeling revealed that the special cubic model obtained the best fit (R2 ~0.98, ERMSE ~8.07 NmL/g VS), demonstrating significant synergistic effects between the components. Additionally, based on the amount of FVW generated at CEASA-PE, a deterministic analysis of potential generation of 124 MWh per month in electricity was performed. The probabilistic analysis via Monte Carlo simulation estimated an electricity generation potential of approximately 1.0 GWh/a for CEASA-PE. The results confirm the technical and energetic viability of using optimized inoculum mixtures for the valorization of urban organic waste in decentralized systems.

Graphical abstract