| Autor: |
Cerdán, José Manuel Alejandro, Tejido-Nuñez, Yaiza, Aymerich, Enrique, de GoñiGoñi, Jaime González-Mtnez, Garcia-Aguirre, Jon |
| Zdroj: |
Waste & Biomass Valorization; 2021, Vol. 12 Issue 3, p1357-1369, 13p |
| Abstrakt: |
In this study, a systematic comparison between methanogenic and acidogenic potential tests of five waste streams from urban and agro-industrial origin was investigated. Methanogenic potential tests were performed under neutral pH (7.0) and thermophilic temperature (55°C). Additionally, acidogenic potential tests consisted of mono-fermentation tests at acidic pH (5.5) and co-fermentation tests performed at alkaline pH (9.0), under thermophilic temperature (55 °C). The methanogenic yield increased up to 0.54 gCH4 g−1 CODfed while the acidogenic yield ranged within 0.04–0.24 g VFA g−1 CODfed. The VFA (volatile fatty acids) yield was boosted when adding co-substrates that complemented the optimal C/N balance, i.e. 0.27–0.36 gVFA g−1 CODfed. Herein, highest total volatile fatty acid (tVFA) concentration was attained by microalgae biomass (MB), with 8769 mg COD L−1. During mono-fermentation tests under acid pH, butyric acid was promoted as main fermentation product, which varied between 1526 and 6114 mg COD L −1, whereas shifting to alkaline pH in co-fermentation tests promoted acetic production, from 3387 to 5415 mg COD L−1. The results of the current research revealed a significant potential of organic waste to enrich the carboxylic platform (e.g. acetic and butyric acids), which have higher industrial applicability and economic potential than methane. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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