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Author: search.filters.author.Gaibor Chávez, JuanSubject: search.filters.subject.SYNERGY

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    Evaluation of methane production from the anaerobic co-digestion of manure of guinea pig with lignocellulosic Andean residues
    (Universidad Estatal de Bolívar, 2021-08-07) Meneses Quelal, Washington Orlando; Velázquez Martí, Borja; Gaibor Chávez, Juan; Niño Ruiz, Zulay; Ferrer Gisbert, Andrés
    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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    Effect of the co-digestion of agricultural lignocellulosic residues with manure from South American camelids
    (Universidad Estatal de Bolívar, 2021-01-05) Meneses Quelal, Orlando; Velázquez Martí, Borja; Gaibor Chávez, Juan; Niño Ruiz, Zulay
    This study aims to evaluate the effects of the co-digestion of agricultural residues with manure from camelids from the Andean zone. Different combinations of llama manure (LM) and vicuñas (VM) were made with amaranth (AS), quinoa (QS), and wheat (WS) residues. They were fermented using sewage sludge as inoculum. The co-digestion was evaluated under mesophilic conditions for 40 days. The ratios of volatile substances of substrate / co-substrate evaluated were 0:100; 25:75; 50:50, 75:25, and 100:0. Two substrate / inoculum ratios (SIR 1:1 and SIR1:2) were also evaluated. The results indicate that the maximum methane accumulation rate is obtained in SIR 1:1 for a VM-AS ratio (25:75) with 540 mL/g volatile solid (VS). In general, the results did not increase with the increase in inoculum; rather, the tendency to improve methane yield is associated with an increase in the amount of agricultural residues, mainly AS. Regarding the kinetic modeling, the transfer model is the one that best adjusted the predicted values to those observed with an r2 between 0.991 and 0.999, and an RMSE value between 2.06 and 13.62 mL/g (volatile solid) VS. Finally, all the trials presented synergistic effects in their co-digestion except the digesters formed by LM-AS, LM-QS and LM-WS of SIR 1:2. These presented antagonistic effects in which the addition of the co-substrate generated competition with the substrates, reducing methane production. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd