The trade-offs and effect of carrier size and oxygen-loading on gaseous toluene removal performance of a three-phase circulating-bed biofilm reactor.
Appl Microbiol Biotechnol
; 61(3): 214-9, 2003 May.
Article
en En
| MEDLINE
| ID: mdl-12698278
ABSTRACT
We conducted a series of steady-state and short-term experiments on a three-phase circulating-bed biofilm reactor (CBBR) for removing toluene from gas streams. The goal was to investigate the effect of macroporous-carrier size (1-mm cubes versus 4-mm cubes) on CBBR performance over a wide range of oxygen loading. We hypothesized that the smaller biomass accumulation with 1-mm carriers would minimize dissolved-oxygen (DO) limitation and improve toluene removal, particularly when the DO loading is constrained. The CBBR with 1-mm carriers overcame the performance limitation observed with the CBBR with 4-mm carriers i.e., oxygen depletion inside the biofilm. The 1-mm carriers consistently gave superior removal of toluene and chemical oxygen-demand, and the advantage was greatest for the lowest oxygen loading and the greatest toluene loading. The 1-mm carriers achieved superior performance because they minimized the negative effects of oxygen depletion, while continuing to provide protection from excess biomass detachment and inhibition from toluene.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Oxígeno
/
Tolueno
/
Biopelículas
/
Reactores Biológicos
/
Gases
Idioma:
En
Revista:
Appl Microbiol Biotechnol
Año:
2003
Tipo del documento:
Article
País de afiliación:
Estados Unidos