Use of Lignocellulosic Residue from Second-Generation Ethanol Production to Enhance Methane Production Through Co-digestion

Autor: Gustavo Mockaitis, Telma Teixeira Franco, Lívia B. Brenelli, Bruna de Souza Moraes, Maria Paula Cardeal Volpi, Sarita Cândida Rabelo
Přispěvatelé: Universidade Estadual de Campinas (UNICAMP), Brazilian Center of Research in Energy and Materials (CNPEM), Universidade Estadual Paulista (UNESP)
Rok vydání: 2021
Předmět:
Zdroj: Scopus
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
ISSN: 1939-1242
1939-1234
Popis: Made available in DSpace on 2022-04-28T19:40:53Z (GMT). No. of bitstreams: 0 Previous issue date: 2022-03-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) This is a pioneer study evaluating the methane (CH4) production potential from residues of integrated first (vinasse and filter cake) and second (deacetylation pretreatment liquor from straw) generation (1G2G) sugarcane biorefinery, providing a fully chemical characterization of them and their relation with the anaerobic digestion (AD) process. Small-scale assays provided fundamentals for basing the co-digestion optimization by assessing the optimal co-substrates synergistic conditions. Biochemical methane potential (BMP) tests showed co-digestion enhanced CH4 yield of isolated substrates, reaching up to 605 NmLCH4 gVS−1. The association of vinasse and deacetylation liquor as co-substrates increased the BMP by ~ 38% mostly by nutritionally benefiting the methanogenic activity. The kinetic analysis confirmed that the deacetylation liquor was the co-substrate responsible for improving the CH4 production in the co-digestion systems due to the highest CH4 conversion rate. The alkaline characteristic of the liquor (pH ~ 12) also prevented alkalizing from being added to the co-digestion, an input that normally makes the process economically unfeasible to implement on an industrial scale due to the large quantities required for buffering the reactor. The filter cake had the lowest BMP (262 NmLCH4 gVS−1) and digestibility (≤ 40%), further limited by the required stirring to improve the mass transfer of biochemical reactions. The present study drives towards the more sustainable use of vinasse, the most voluminous waste from the sugarcane industry, and lignin-rich residues derived from pretreatment alkaline methods, aiming at an energy-efficient utilization, by at least 16% when compared to the traditional vinasse AD. The experimental and modeling elements from this work indicated the lignin-rich liquor is the main responsible for putting the co-digestion as a disruptive technological arrangement within the 1G2G sugarcane biorefineries, reinforcing the biogas production as the hub of the bioeconomy in the agroindustrial sector. Interdisciplinary Center of Energy Planning University of Campinas (NIPE/UNICAMP), R. Cora Coralina, 330 – Cidade Universitária, São Paulo Interdisciplinary Research Group On Biotechnology Applied To the Agriculture and the Environment (GBMA) School of Agricultural Engineering (FEAGRI) University of Campinas (UNICAMP), Av. Candido Rondon, 501 – Cidade Universitária, São Paulo Brazilian Biorenewables National Laboratory (LNBR) Brazilian Center of Research in Energy and Materials (CNPEM), Giuseppe Máximo Scolfaro, 10000 – Bosque das Palmeiras, São Paulo Department of Bioprocess and Biotechnology College of Agricultural Sciences São Paulo State University (UNESP), Av. Universitária, nº 3780 – Altos do Paraíso, São Paulo Chemical Engineering School University of Campinas (FEQ/UNICAMP), Av. Albert Einstein 500, São Paulo Department of Bioprocess and Biotechnology College of Agricultural Sciences São Paulo State University (UNESP), Av. Universitária, nº 3780 – Altos do Paraíso, São Paulo FAPESP: 2015/50612-8 FAPESP: 2016/16438-3 FAPESP: 2018/09893-1
Databáze: OpenAIRE
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