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Evaluation of methane production from the anaerobic co-digestion of manure of guinea pig with lignocellulosic Andean residues

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Abstract

The objective of this research was to evaluate anaerobic co-digestion of guinea pig manure (GP) with Andean agricultural residues such as amaranth (AM), quinoa (QU) and wheat (TR) in batch biodigesters under mesophilic conditions (37 0C) for 40 days. As microbial inoculum, sewage treatment sludge was used in two inoculum/substrate ratios (ISR of 1 and 2). In terms of methane production, the best results occurred in treatments containing AM and QU as co-substrate and an ISR of 2. Thus, the highest methane production yield in the GP:AM biodigesters (25:75) and GP:QU (25:75) with 341.86 mlCH4/g VS added and 341.05 mlCH4/g VS added, respectively. On the other hand, the results showed that methane production with an ISR of 2 generated higher yields for guinea pig waste and the methane fraction of the biogas generated was in a range from 57 to 69%. Methane production kinetics from these raw materials was studied using five kinetic models: modified Gompertz, logistic equation, transfer, cone and Richards. The cone model adjusted best to the experimental values ​​with those observed with r2 of 0.999 and RMSE of 1.16 mlCH4/g VS added. Finally, the highest biodegradability (experimental yield/theoretical yield) was obtained in the GP-AM biodigesters (25:75) with 67.92%.

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Acknowledgements

This work has been carried out within the framework of the project "Analysis of the implementation of biomass exploitation chains in rural communities in the province of Bolívar (Ecuador)" of the ADSIEO-COOPERATION program of the Polytechnic University of Valencia (UPV). The Ecuadorian Energy Exploitation Research Network of Biomass (ECUMASA) and the IBEROMASA Network of the Ibero-American Program of Science and Technology for Development (CYTED) have participated in this program.

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Contributions

Contribution of each co-author is described below:

OWMQ: performed the conceptualization, methodology, validation, formal analysis, investigation and writing-original draft preparation.

BVM: performed the conceptualization, methodology, validation, formal analysis, investigation, writing—original draft preparation, writing review and editing and funding acquisition.

JGC: performed the formal analysis and funding acquisition.

ZNR: performed the methodology, validation, writing review and editing and funding acquisition.

AFG: performed the writing review and editing.

Corresponding author

Correspondence to Borja Velázquez-Martí.

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The datasets during the current study are available from the corresponding author on reasonable request.

Competing interests

The authors declare that they have no competing interests.

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Responsible Editor: Ta Yeong Wu

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Meneses Quelal, W.O., Velázquez-Martí, B., Gaibor Chávez, J. et al. Evaluation of methane production from the anaerobic co-digestion of manure of guinea pig with lignocellulosic Andean residues. Environ Sci Pollut Res 29, 2227–2243 (2022). https://doi.org/10.1007/s11356-021-15610-x

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  • DOI: https://doi.org/10.1007/s11356-021-15610-x

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