Abstract
Experiments in series horizontal anaerobic reactors with fixed bed (HARFB) were conducted to evaluate the co-digestion of crude glycerol (CG) from biodiesel production and domestic sewage (DS) concerning the start-up strategy and best organic loading rate (OLR) to improve biogas production as well as to analyze the dynamic changes in the anaerobic microbial consortium during their operation. This approach can be used to increase the buffering capacity of anaerobic reactors as well as dilute toxic compounds. The reactor configuration applied at the present research is a novelty about CG and DS co-digestion and biogas production. The highest hydrogen generation was 10.3 mol H2 (m3 day−1) in reactor R1, and the highest methane yield was 312.0 and 283.9 L CH4 (m3 day−1) in R2 and R3, respectively. These values, obtained with mixed culture, agree with previous co-digestion research. The three-stage system showed high efficiency in removing crude glycerol and chemical oxygen demand (COD), with consumptions of 99.9%, both. The strategy of co-digestion is positive to avoid substrate inhibition. In addition, there was a change in the relative abundance of microorganisms among R1, R2, and R3 and a considerable decrease in the diversity index in the fermentation reactor (R1). The results have shown the potential of applying HARFB reactors for energy recovery and alternative waste disposal.
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All experimental data generated or analyzed during this study are included in this published article and its supplementary information files.
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Acknowledgements
This work was supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPQ) under Grant 407298/2018-5 and 457144/2014-9; and Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) under Grant 2017/11767-1 and 2017/25329-6. The authors are also grateful to the “Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil” (CAPES) – Finance Code 001.
Funding
This work was supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPQ) under Grant 407298/2018–5 and 457144/2014–9; and Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) under Grant 2017/11767–1 and 2017/25329–6. The authors are also grateful to the “Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil” (CAPES) – Finance Code 001.
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All authors contributed to the study’s conception and design. Luan Vieira Adames, Ana Paula Jacobus, and Isabel Sakamoto performed material preparation, data collection, and analysis. Sandra Imaculada Maintinguer and Lorena Oliveira Pires made funding acquisition, advising, and experimental outline. Luan Vieira Adames wrote the first draft of the manuscript. Discussion, English, and text revised by Carolina Zampol Lazaro. All authors commented on previous versions of the manuscript read and approved the final manuscript.
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Adames, L.V., Jacobus, A.P., Sakamoto, I.K. et al. Bioenergy Recovery from Anaerobic Co-Digestion of Crude Glycerol and Domestic Sewage In-Series Reactor: Microbial Characterization and System Performance. Bioenerg. Res. 15, 2145–2158 (2022). https://doi.org/10.1007/s12155-022-10417-1
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DOI: https://doi.org/10.1007/s12155-022-10417-1