Biowaste management by hydrothermal carbonization and anaerobic co-digestion: Synergistic effects and comparative metagenomic analysis
Entity
UAM. Departamento de Ingeniería QuímicaPublisher
ElsevierDate
2024-05-15Citation
10.1016/j.wasman.2024.03.019
Waste Management 180 (2024): 1-8
ISSN
0956-053X (print)DOI
10.1016/j.wasman.2024.03.019Funded by
PDC2021-120755-I00, TED2021-130287B-I00Project
Gobierno de España. PDC2021-120755-I00; Gobierno de España. TED2021-130287B-I00Editor's Version
https://doi.org/10.1016/j.wasman.2024.03.019Subjects
Energy Recovery; Food Waste; Garden and Park Waste; Methane Yield; Organic Loading Rate; QuímicaRights
© 2024 The AuthorsAbstract
The feasibility of anaerobic co-digestion in semicontinuous mode of two major urban biowaste, food waste (FW) and garden and park waste (GPW) (75 % FW and 25 % GPW) as well as the co-digestion of FW with the process water originated from the hydrothermal carbonization of GPW (95 % FW and 5 % process water), both on a COD basis, has been assessed. The effect of varying organic loading rate (OLR) from 1.5 to 3.5 g COD/L⋅d on methane yield, gross energy recovery, and microbiome population was evaluated. For comparison, anaerobic digestion of FW was also conducted to determine the best strategy for sustainable biowaste management. This study showed an optimal OLR of 2.5 g COD/L⋅d. Acetic and propionic acid content increased as OLR raised for each condition studied, while methane yield decreased at the highest OLR tested indicating overloading of the system. The anaerobic co-digestion of FW and process water showed a 10 % increase on methane production compared to anaerobic digestion of FW (324 vs. 294 mL CH4 STP/L⋅d). Moreover, it enhances the process due to a greater abundance and diversity of hydrolytic and acidogenic bacteria belonging to Bacterioidota, Firmicutes, and Chloroflexi phyla, as well as promotes the hydrogenotrophic pathway under higher propionic concentrations which is not usually favoured for methane production. The integration of hydrothermal carbonization of GPW with the anaerobic co-digestion of 95 % FW and 5 % of process water results in the highest potential energy recovery and could be a good strategy for sustainable management of urban biowaste
Files in this item
Google Scholar:Suarez, Eneko
-
Tobajas Vizcaíno, Montserrat
-
Fernández Mohedano, Ángel
-
Rubia Romero, María de los Ángeles de la
This item appears in the following Collection(s)
Related items
Showing items related by title, author, creator and subject.