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- Title
Process Parameters and Energy Evaluation of Biological Hydrogen and Methane Sequentially Produced Using Residual Glycerin from Biodiesel.
- Authors
de Oliveira Faber, Mariana; de Meireles, Pérola Lana Souza; Ferreira-Leitão, Viridiana Santana
- Abstract
Glycerin from biodiesel production can be considered a low-value-added product, which can be valorized if used as feedstock in biological processes. For this, hydrogen (H2) and methane (CH4) production via dark fermentation followed by anaerobic digestion showed promising results. Batch-mode was used to investigate the influence of batch-reactor headspace, hydrogen partial pressure, and glycerol initial concentration over H2 production. During H2 production, the increase in the reactor headspace from 15 to 50% promoted 91% improvement of H2 production. Additionally, the increase in initial glycerol concentration from 3 to 7 g/L exhibited no adverse effect on H2 production; however, H2 partial pressure higher than 0.25 atm showed an inhibitory pattern. The two-stage anaerobic digestion was performed by applying glycerin as feedstock in the acidogenic stage and its effluent as feedstock in the methanogenic stage, leading to 247 N-mL-H2/L-medium in 26 h and 729 N-mL-CH4/L-medium in 39 days. Comparatively, glycerin was used as feedstock to direct anaerobic digestion, in which 376 N-mL/L of CH4 was generated in 41 days. The two-stage anaerobic digestion resulted in an energetic yield 118% higher and a COD removal 95% superior to the single-stage. This study proposed a simple medium containing a balanced composition of nitrogen, phosphorus, and Tween 80, in addition to the carbon source and inoculum. The adjustment of batch-reactor headspace and glycerol initial concentration enabled a short fermentation time, which resulted in higher productivity. The glycerin was digested in two stages as the sole carbon source, generating H2 and CH4 separately.
- Subjects
BIOENERGETICS; METHANE as fuel; ANAEROBIC digestion; GLYCERIN; PARTIAL pressure; METHANE
- Publication
BioEnergy Research, 2023, Vol 16, Issue 3, p1758
- ISSN
1939-1234
- Publication type
Article
- DOI
10.1007/s12155-022-10539-6