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A Comprehensive Comparison of Methane and Bio-Based Volatile Fatty Acids Production from Urban and Agro-Industrial Sources

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Abstract

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.

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Acknowledgements

Ceit would like to thank Gipuzkoa Provincial Council- Department of Environment and Hydraulic Works for its financial support and all the staff from the WWTP of San Sebastian. Furthermore, authors would like to thank Raul Muñoz, from the University of Valladolid, for kindly providing the microalgae biomass used in the present research.

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  1. CEIT - Basque Research and Technology Alliance (BRTA), Manuel Lardizabal 15, 20018, Donostia/San Sebastián, España

    José Manuel Alejandro Cerdán, Yaiza Tejido-Nuñez, Enrique Aymerich, Jaime González-Mtnez de GoñiGoñi & Jon Garcia-Aguirre

  2. Universidad de Navarra, Tecnun, Manuel Lardizabal 13, 20018, Donostia/San Sebastián, Spain

    José Manuel Alejandro Cerdán, Yaiza Tejido-Nuñez, Enrique Aymerich, Jaime González-Mtnez de GoñiGoñi & Jon Garcia-Aguirre

  3. Universidad Nacional Agraria La Molina, Av. La Molina s/n, 15024, La Molina/Lima, Perú

    José Manuel Alejandro Cerdán

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Cerdán, J.M.A., Tejido-Nuñez, Y., Aymerich, E. et al. A Comprehensive Comparison of Methane and Bio-Based Volatile Fatty Acids Production from Urban and Agro-Industrial Sources. Waste Biomass Valor 12, 1357–1369 (2021). https://doi.org/10.1007/s12649-020-01093-3

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