Biodegradation Of Phenol In A Draft-tube
Spouted Bed Bioreactor With Biomass Attached
To Hydrogel Particles
Author(s)
B. Safont, A. I. Vitas & F. J. Peñas
Abstract
The performance of a draft-tube spouted bed bioreactor (DT-SBB) packed with
hydrogel particles for biomass immobilization has been used to treat a phenolic
wastewater in continuous mode. The biomass support particles were made of a
cyclodextrin-based polymer and then seeded with an acclimated mixed culture.
Due to the low density of such particles and also the bioreactor design, the
pumping energy required to maintain a moving bed of the resulting bioparticles
was very low and a recirculation flow was not necessary. The inlet phenol
concentration and the phenol inlet loading rate were the operating variables
studied. Phenol removal efficiency was used to monitor the process. The DTSBB
showed a high removal capacity (up to 2.8 kg-phenol/m3d) with a high
efficiency (>99%). The removal capacity of the DT-SBB was found to be limited
by the availability of dissolved oxygen in periods with high phenol elimination
rate. The removal efficiency decreased significantly for higher loading rates
(>3.1 kg/m3d) because of phenol inhibition. The evolution of the distribution of
microbial populations was also investigated. A predominance of gram-negative
bacteria (especially the genera Pseudomonas and Acinetobacter) was observed
during the periods of maximum degradation.
Keywords: spouted bed bioreactor, draft-tube, cyclodextrin polymer, hydrogel
biomass support, phenol aerobic degradation.
Keywords
spouted bed bioreactor, draft-tube, cyclodextrin polymer, hydrogel
biomass support, phenol aerobic degradation
Related Book
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