Statistical optimization of methane production from brewery spent grain: Interaction effects of temperature and substrate concentration
| Autor: | Marina Mauro Gomes, Camila Abreu B. Silva Rabelo, Edson Luiz Silva, Maria Bernadete Amâncio Varesche, Isabel Kimiko Sakamoto |
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| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
Central composite design Methanogenesis 0208 environmental biotechnology 02 engineering and technology Euryarchaeota 010501 environmental sciences Management Monitoring Policy and Law Interaction 01 natural sciences Methanosaeta Autoclave Bioreactors Organic matter Anaerobiosis Food science Response surface methodology Methane production Waste Management and Disposal 0105 earth and related environmental sciences chemistry.chemical_classification biology Chemistry Temperature General Medicine Fatty Acids Volatile biology.organism_classification 020801 environmental engineering Edible Grain Methane |
| Zdroj: | Journal of Environmental Management. 288:112363 |
| ISSN: | 0301-4797 |
| DOI: | 10.1016/j.jenvman.2021.112363 |
| Popis: | This study evaluated the effects of thermal pretreatment of brewery spent grain (BSG) (by autoclave 121 °C, 1.45 atm for 30 min) on methane production (CH4). Operation temperature (31–59 °C) and substrate concentration (8.3–19.7 g BSG.L−1) factors were investigated by Response Surface Methodology (RSM) and Central Composite Design (CCD). Values ranging from 81.1 ± 2.0 to 290.1 ± 3.5 mL CH4.g−1 TVS were obtained according to operation temperature and substrate concentration variation. The most adverse condition for methanogenesis (81.1 ± 2.0 mL CH4.g−1 TVS) was at 59 °C and 14 g BSG.L−1, in which there was increase in the organic matter concentration from 173.6 ± 4.94 to 3036 ± 7.78 mg.L−1) result of a higher final concentration of volatile fatty acids (VFA, 2662.7 mg.L−1). On the other hand, the optimum condition predicted by the statistical model was at 35 °C and 18 g BSG.L−1 (289.1 mL CH4.g−1 TVS), which showed decrease in the organic matter concentration of 78.6% and a lower final concentration of VFA (533.2 mg.L−1). Hydrogenospora and Methanosaeta were identified in this optimum CH4 production condition, where acetoclastic methanogenic pathway prevailed. The CH4 production enhancement was concomitant to acetic acid concentration decrease (from 578.9 to 135.7 mg.L−1). |
| Databáze: | OpenAIRE |
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