Biogas production and microbial communities of mesophilic and thermophilic anaerobic co-digestion of animal manures and food wastes in Costa Rica

 

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Autores: Murillo Roos, Mariana, Uribe Lorío, Lorena, Fuentes Schweizer, Paola, Vidaurre Barahona, Daniela, Brenes Guillén, Laura Natalia, Jiménez Godínez, Ivannia, Arguedas, Tatiana, Liao, Wei, Uribe Lorío, Lidieth
格式: artículo original
Fecha de Publicación:2022
实物特征:Biomass generated from agricultural operations in Costa Rica represents an untapped renewable resource for bioenergy generation. This study investigated the effects of two temperatures and three mixture ratios of manures and food wastes on biogas production and microbial community structure. Increasing the amount of fruit and restaurant wastes in the feed mixture significantly enhanced the productivity of the systems (16% increase in the mesophilic systems and 41% in the thermophilic). The methane content of biogas was also favored at higher temperatures. Beta diversity analysis, based on high-throughput sequencing of 16S rRNA gene, showed that microbial communities of the thermophilic digestions were more similar to each other than the mesophilic digestions. Species richness of the thermophilic digestions was significantly greater than the corresponding mesophilic digestions (F = 40.08, p = 0.003). The mesophilic digesters were dominated by Firmicutes and Bacteroidetes while in thermophilic digesters, the phyla Firmicutes and Chloroflexi accounted for up to 90% of all sequences. Methanosarcina was the key methanogen and was more abundant in thermophilic digestions. These results demonstrate that increasing digestion temperature and adding food wastes can alleviate the negative impact of low C:N ratios on anaerobic digestion.
País:Kérwá
机构:Universidad de Costa Rica
Repositorio:Kérwá
语言:Inglés
OAI Identifier:oai:kerwa.ucr.ac.cr:10669/86433
在线阅读:https://hdl.handle.net/10669/86433
Palabra clave:Biogas
Chicken litter
Manure
Fruit and vegetable wastes
Restaurant wastes
Bacteria
Archea