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Biodegradation of 3,4‐dichloroaniline in a fluidized bed bioreactor and a steady‐state biofilm Kinetic model
Author(s) -
Livingston Andrew Guy
Publication year - 1991
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.260380308
Subject(s) - bioreactor , biodegradation , fluidized bed , biofilm , diffusion , steady state (chemistry) , chemistry , chemical engineering , degradation (telecommunications) , oxygen , draft tube , kinetics , chromatography , thermodynamics , bacteria , organic chemistry , geology , telecommunications , physics , quantum mechanics , computer science , engineering , paleontology
Mixed culture of microorganisms immobilized onto Celite diatomaceous earth particles were used to degrade 3,4‐dichloroaniline (34DCA) in a three‐phase draft tube fluidized bed bioreactor. Biodegradation was confirmed as the dominant removal mechanism by measurements of the concomitant chloride ion evolution. Degradation efficiencies of 95% were obtained at a reactor retention time of 1.25 h. A mathematical model was used to describe the simultaneous diffusion and reaction of 34DCA and oxygen in the biofilms on the particles in the reactor. The parameters describing freely suspended cell growth on 34DCA were obtained in batch experiments. The model was found to describe the system well for three out of four steady states and to predict qualitatively the experimentally observed transition in the biofilm kinetics from 34DCA to oxygen limitation.