Volatile fatty acid and methane production from vinasse and microalgae using two-stage anaerobic co-digestion.

Autor: Pinheiro AAD; Federal University of Pernambuco, Department of Civil and Environmental Engineering, Cidade Universitária, CEP, Recife, PE, 50670-901, Brazil., da Silva EM; Federal University of Pernambuco, Department of Civil and Environmental Engineering, Cidade Universitária, CEP, Recife, PE, 50670-901, Brazil., de Oliveira DCP; Federal University of Pernambuco, Department of Civil and Environmental Engineering, Cidade Universitária, CEP, Recife, PE, 50670-901, Brazil., Magnus BS; Federal University of Pernambuco, Department of Civil and Environmental Engineering, Cidade Universitária, CEP, Recife, PE, 50670-901, Brazil., Motteran F; Federal University of Pernambuco, Department of Civil and Environmental Engineering, Cidade Universitária, CEP, Recife, PE, 50670-901, Brazil., Florencio L; Federal University of Pernambuco, Department of Civil and Environmental Engineering, Cidade Universitária, CEP, Recife, PE, 50670-901, Brazil., Leite WRM; Federal University of Pernambuco, Department of Civil and Environmental Engineering, Cidade Universitária, CEP, Recife, PE, 50670-901, Brazil. wanderli.leite@ufpe.br.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2024 Jun 26. Date of Electronic Publication: 2024 Jun 26.
DOI: 10.1007/s11356-024-34089-w
Abstrakt: The effects of adding vinasse (VIN) as a co-substrate on the stability and production of volatile fatty acids (VFA) and methane (CH 4 ) during the anaerobic digestion (AD) of microalgal biomass (MB) were evaluated. The AD system consisted of an acidogenic reactor (AR) followed by a methanogenic reactor (MR). The experiment was divided into phase I-start-up and AD of VIN; phase II-MB+VIN co-digestion (50:50 based on chemical oxygen demand (COD)); and phase III-co-digestion of pretreated MB and VIN (PTMB+VIN, 50:50). In phase I, the total amount of VFA in the AR increased from 240 to 2126 mg/L. In the MR, the conversion of VFA into CH 4 yielded an average of 71 ± 37 NmL CH 4 /g COD in . In phase II, the initial CH 4 production was 246 ± 31 mL CH 4 /g COD in but it decreased to 63 mL CH 4 /g COD in due to the accumulation of longer chain acids. More stable conditions were achieved after two hydraulic retention cycles and the average CH 4 yield in this phase was 183 mL CH 4 /g COD in . In phase III, when using PTMB, 197 ± 72 NmL CH 4 /g COD in were obtained, i.e., a 2.7- and 1.1-fold increases compared to phases I and II, respectively. The predominance of acetate producers and syntrophic organisms suggests acetoclastic methanogenesis, confirmed by the occurrence of Methanosaeta (10.5%).
(© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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