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Metanogénesis y crecimiento bacteriano a partir de CO2 con el hierro elemental como única fuente de electrones
Science (New York, N.Y.)
|July 31, 1987
Resumen
Las bacterias metanogénicas aceleran la corrosión de los metales al consumir hidrógeno. Estos microbios utilizan el hierro elemental como fuente de energía, impulsando procesos de biocorrosión anaeróbica en materiales que contienen hierro.
Área de la Ciencia:
- Microbiología Microbiología.
- Ciencia de la corrosión Ciencia de la corrosión.
- La electroquímica es electroquímica.
Sus antecedentes:
- La biocorrosión anaeróbica está influenciada por los productos microbianos de azufre y fósforo, y el consumo de hidrógeno.
- Las bacterias metanogénicas prevalecen en entornos anaerobios y utilizan dióxido de carbono e hidrógeno para producir metano.
- Estas bacterias pueden utilizar el hierro elemental (Fe ((0)) o el hierro en acero blando como fuente de electrones.
Objetivo del estudio:
- Para investigar el papel de las bacterias metanogénicas en la corrosión anaeróbica del hierro.
- Para aclarar el mecanismo por el cual los metanógenos contribuyen a la oxidación de los metales.
Principales métodos:
- Cálculos termodinámicos para evaluar la viabilidad de la oxidación del hierro.
- Análisis de los procesos de transferencia de electrones que involucran bacterias metanogénicas y hierro.
Principales resultados:
- Las bacterias metanogénicas utilizan la oxidación de Fe para obtener energía y crecimiento.
- El mecanismo implica la despolarización catódica, donde la oxidación de Fe(0) produce hidrógeno (H(2) consumido por los metanógenos.
- La oxidación significativa de Fe ((0) es termodinámicamente dependiente del consumo de hidrógeno.
Conclusiones:
- Los metanógenos juegan un papel importante en la corrosión anaeróbica del hierro y el acero.
- El mecanismo de despolarización catódica explica la contribución de los metanógenos a la biocorrosión.
- La comprensión de esta interacción microbiana es crucial para la gestión de la corrosión en entornos anaerobios.
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