Internal mass transfer effect on biodegradation of phenol by Ca-alginate immobilized Ralstonia eutropha

Phenol biodegradation by free and Ca-alginate immobilized Ralstonia eutropha was performed in batch system. Optimum initial pH and temperature were determined as 7 and 30 °C, respectively for free cells, while a wide pH and temperature range were obtained for immobilized cells. Phenol had a strong i...

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Bibliographic Details
Published in:Journal of hazardous materials 2005-11, Vol.126 (1), p.105-111
Main Authors: Dursun, Arzu Y., Tepe, Ozlem
Format: Article
Language:English
Subjects:
Alginates - metabolism
Applied sciences
Biodegradation
Biodegradation, Environmental
Biomass
Chemical engineering
Cupriavidus necator - metabolism
Diffusion limitation
Effective diffusion coefficients
Exact sciences and technology
Glucuronic Acid - metabolism
Heat and mass transfer. Packings, plates
Hexuronic Acids - metabolism
Hydrogen-Ion Concentration
Immobilized Ralstonia eutropha
Industrial Waste - prevention & control
Kinetics
Mass transfer
Osmolar Concentration
Particle Size
Phenol
Phenol - metabolism
Pollution
Temperature
Water Pollutants, Chemical - isolation & purification
Water Pollution, Chemical - prevention & control
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Summary:Phenol biodegradation by free and Ca-alginate immobilized Ralstonia eutropha was performed in batch system. Optimum initial pH and temperature were determined as 7 and 30 °C, respectively for free cells, while a wide pH and temperature range were obtained for immobilized cells. Phenol had a strong inhibitory effect on the microbial growth and Haldane model was used to describe the substrate inhibition. Model parameters were determined as μ max = 0.89 h −1, K S = 55.11 mg dm −3 and K I = 257.94 mg dm −3 by non-linear regression analysis. The effective diffusion coefficient of phenol in immobilized particles was calculated. For this purpose, using biodegradation rates experimental effectiveness factors were determined for different sized immobilized particles. The Thiele modulus was evaluated from experimental effectiveness factors. Then the average effective diffusion coefficient was calculated as 1.21 × 10 −7 cm 2 s −1. These results showed that intraparticle diffusion resistance was important for this system and could not be ignored.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2005.06.013