Effect of methanogenic effluent recycling on continuous H2production from food waste
| Autor: | Xiomar Gómez, J. Fierro, Judith E. Martínez, Antonio Morán, Vanesa Redondas |
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| Rok vydání: | 2014 |
| Předmět: |
Environmental Engineering
Waste management Renewable Energy Sustainability and the Environment Chemistry General Chemical Engineering Ultrafiltration Dark fermentation Food waste Biogas Environmental Chemistry Fermentation Nanofiltration Waste Management and Disposal Effluent General Environmental Science Water Science and Technology Hydrogen production |
| Zdroj: | Environmental Progress & Sustainable Energy. 34:227-233 |
| ISSN: | 1944-7442 |
| DOI: | 10.1002/ep.11980 |
| Popis: | The production of hydrogen from food wastes was studied in a two-stage (dark fermentation-digestion) process under mesophilic conditions. The effect of a recycling stream, from the methanogenic phase to the fermentation phase, over H2 production and alkali consumption was evaluated in a semicontinuous fermentation process. The cases of no-recycling, direct recycling, and membrane permeate recycling of methanogenic supernatant (using an ultrafiltration and nanofiltration membrane) were evaluated. Adding a recycling stream from a methanogenic reactor to the hydrogen-producing reactor significantly reduced the need of external alkali addition for pH control, up to 52%. The performance of the hydrogen-producing reactors receiving the recycling stream was similar in all cases tested, with values of specific hydrogen production of about 30 mL g−1 VSadded. This value was also similar to that one obtained from the no-recycling configuration. The use of a membrane pretreatment stage proved to be not necessary. Operating conditions established in the fermentation stage were enough to avoid any detrimental effect associated to methanogenic microflora predominance. © 2014 American Institute of Chemical Engineers Environ Prog, 34: 227–233, 2015 |
| Databáze: | OpenAIRE |
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