In-situ methane enrichment in continuous anaerobic digestion of pig slurry by zero-valent iron nanoparticles addition under mesophilic and thermophilic conditions
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Author
Burgos, Laura
Ruiz, Beatriz
Barrena, Raquel
Moral-Vico, Javier
Font, Xavier
Sánchez, Antoni
Bonmatí, August
Publication date
2021-08-27ISSN
0960-1481
Abstract
The effect of zero-valent iron nanoparticles (nZVI) addition on methane production during anaerobic digestion of pig slurry was assessed. Experiments were conducted using two experimental set-ups: batch and long-term continuous operation at a fixed nZVI dosage. Two different temperature operation ranges (mesophilic and thermophilic) were assessed. Biogas production and methane content were monitored, and the specific methanogenic activity of the biomass and nZVI oxidation state were evaluated at different times. The results of batch experiments at mesophilic temperature operation showed an inhibition of methane production at all tested dosages (42, 84, 168 and 254 mgnZVI g−1 VSS concentrations), while methane production was boosted with the lowest dosage in thermophilic temperature operation. In continuous operation, nZVI addition produced an increase in methane content of biogas, achieving values between 80 and 85% in both temperature ranges. The average methane production rate increased 165% and 94% with respect to the control in thermophilic and mesophilic temperature range, respectively. The oxidation state of nZVI showed a value of +3 almost immediately after contact with substrate and a slower progressive oxidation during the reactors operation. The obtained results indicate that nZVI addition in anaerobic digestion is an interesting strategy for in situ biogas upgrading.
Document Type
Article
Document version
Accepted version
Language
English
Subject (CDU)
636 - Animal husbandry and breeding in general. Livestock rearing. Breeding of domestic animals
Pages
39
Publisher
Elsevier
Is part of
Renewable Energy
Citation
Cerrillo, Míriam, Laura Burgos, Beatriz Ruiz, Raquel Barrena, Javier Moral-Vico, Xavier Font, Antoni Sánchez, and August Bonmatí. 2021. "In-Situ Methane Enrichment In Continuous Anaerobic Digestion Of Pig Slurry By Zero-Valent Iron Nanoparticles Addition Under Mesophilic And Thermophilic Conditions". Renewable Energy 180: 372-382. doi:10.1016/j.renene.2021.08.072.
Grant agreement number
MINECO/Programa Estatal de I+D+I orientada a los retos de la sociedad/RTA2015-00079-C02-01/ES/Uso de reactores bioelectroquímicos para optimizar la recuperación de energía y nutrientes de aguas residuales de alta carga/
Program
Sostenibilitat en Biosistemes
This item appears in the following Collection(s)
- ARTICLES CIENTÍFICS [2503]
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Except where otherwise noted, this item's license is described as http://creativecommons.org/licenses/by-nc-nd/4.0/