Hydrogen production with immobilized sewage sludge in three-phase fluidized-bed bioreactors.
Biotechnol Prog
; 19(3): 828-32, 2003.
Article
en En
| MEDLINE
| ID: mdl-12790646
Municipal sewage sludge was immobilized with a modified alginate gel entrapment method, and the immobilized cells were used to produce hydrogen gas in a three-phase fluidized bed. The hydrogen-producing fluidized beds were operated at different liquid velocity (U(0)) and hydraulic retention time (HRT). The results show that in response to operating liquid velocities, the fluidized-bed system had three flow regimes, namely, plug flow, slug flow, and free bubbling. Pressure fluctuation analysis was used to analyze the hydrodynamic properties in this three-phase fluidized bed when it was under a steady-state production of biogas. With a steady-state biogas production rate (U(g)) of 0.196 mL/s/L, a transition state occurred at a liquid velocity (U(0)) of 0.85 cm/s. As U(0) < 0.85 cm/s, the system was basically a nonhomogeneous fluidized bed, whereas the bed became homogeneous when U(0) was higher than 0.85 cm/s. The fluidized bed can be stably carried out at high loading rates (HRT as low as 2 h). Hydrogen fermentation results show that the maximal hydrogen production rate was 0.93 L/h/L and the best yield (Y(H)2(/sucrose)) was 2.67 mol H(2)/mol sucrose.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Reología
/
Aguas del Alcantarillado
/
Técnicas de Cultivo de Célula
/
Hidrógeno
Tipo de estudio:
Evaluation_studies
Idioma:
En
Revista:
Biotechnol Prog
Asunto de la revista:
BIOTECNOLOGIA
Año:
2003
Tipo del documento:
Article
País de afiliación:
Taiwán
Pais de publicación:
Estados Unidos