Estudio exploratorio del efecto combinado de la adsorción y degradación de sulfuros por medio de bacterias fijadas en carbón activado
From the anaerobic fermentation of biomass it is possible to produce biogas as an alternative energy source. Although their composition can vary according to the source of substrate used as well as the fermentation conditions, it typically ranges from CH4 between 50-75%, N2 between 0-10%, H2 0-3%, O...
- Autores:
-
Rojas Vargas, Juan Felipe
- Tipo de recurso:
- Fecha de publicación:
- 2017
- Institución:
- Universidad de los Andes
- Repositorio:
- Séneca: repositorio Uniandes
- Idioma:
- spa
- OAI Identifier:
- oai:repositorio.uniandes.edu.co:1992/61477
- Acceso en línea:
- http://hdl.handle.net/1992/61477
- Palabra clave:
- Absorción
Adsorción
Biofiltración
Biogás
- Rights
- openAccess
- License
- http://creativecommons.org/licenses/by-nc-nd/4.0/
| Summary: | From the anaerobic fermentation of biomass it is possible to produce biogas as an alternative energy source. Although their composition can vary according to the source of substrate used as well as the fermentation conditions, it typically ranges from CH4 between 50-75%, N2 between 0-10%, H2 0-3%, O2 less than 0.1 %, CO2 between 25-50% and H2S between 0-3% (Herout et al., 2011). However for economic (corrosion) and health reasons (toxicity) traces of H2S and CO2 must be removed from the gas streams. In particular the presence of sulfuric acid at 1 ppm starts to produce rotten egg odor and above 10 ppm the toxicity limits begin to be exceeded (E.M. Elkanzi 2009). Today, there are several physical and chemical remotion methods widely used for the elimination of H2S and CO2 depending on the conditions of the gas to be purified. Among these, the implementation of biological purification systems has been widely studied, because these processes directly oxidize H2S to elemental sulfur with lower energy, capital cost and waste generation (Amirfakhri, Vossoughi, & Soltanieh, 2006). A bioabsorption system is proposed in which the gas stream goes through a column packed with activated carbon with sulfuroxidating bacteria immobilized on its surface, whereas an aqueous liquid stream of 20% NaOH and nutrients are fed in counter current, removing by chemical reaction the unwanted compounds ( H2S and CO2), to be later metabolized and degraded by bacteria. For this work, the technical feasibility of the implementation of the bioabsorption system of packed bed with immobilized bacteria was evaluated. This was done from the selection of a bacteria with the oxidizing characteristics of sulfur compounds and the determination of sulfur removal parameters for the isolated bacteria... |
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