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

Dursun, Arzu; Tepe, Özlem

doi:10.1016/j.jhazmat.2005.06.013

Cited by 110 publications

(53 citation statements)

References 18 publications

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“…The average diffusion coefficient of MO in alginate with different additives (9.38×10 −9 cm 2 s −1 ) was lower than that in water (4.69× 10 −7 cm 2 s −1 at 35°C, calculated based on the Wilke and Chang equation (Wilke and Chang 1955)). The exclusion effect (the biopolymer reduces the volume available for substrate to move in) and the obstruction effect (the impenetrable part of biopolymer increase the path length for movement of substrate) may be attributed to the smaller diffusion coefficient in the matrices (Dursun and Tepe 2005). The coefficient of alginate and PAC beads (2.25×10 −8 cm 2 s −1 ) was five times of magnitude larger than that of the alginate beads, indicating the significant enhancement of intraparticle diffusion by adding PAC.…”

Section: Discussionmentioning

confidence: 99%

“…The Thiele moduli were found to be 5.81 to 15.88, showing the importance of internal diffusion effects on the overall bio-decolorization rate. Higher ϕ and smaller η values indicate that the intraparticle diffusion has more significant effect on the degradation rate, and the diffusion step controls the overall rate (Dursun and Tepe 2005).…”

Section: Adsorption Isothermsmentioning

confidence: 99%

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Decolorization characteristics of a newly isolated salt-tolerant Bacillus sp. strain and its application for azo dye-containing wastewater in immobilized form

Zhang

Tang

et al. 2015

Appl Microbiol Biotechnol

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Strain CICC 23870 capable of decolorization of various azo dyes under high saline conditions was isolated from saline-alkali soil. The oxygen-insensitive azoreductase in crude extracts exhibited a wide substrate adaptively in the presence of NADH as a cofactor. The decolorization process by free cells followed first-order kinetics, with a high Methyl Orange (MO) tolerance concentration up to 100 mg l(-1) estimated by Haldane model. The average decolorization rate of free cell system was 26.30 mg g(-1) h(-1) at initial MO concentration of 32.7 mg l(-1). However, the values for the systems of immobilized cells (4 mm) in alginate, alginate and nano-TiO2, and alginate and powered activated carbon (PAC) were 6.83, 4.64, and 11.34 mg g(-1) h(-1), respectively. The effective diffusion factors in the tree different matrices were calculated by diffusion-based mathematic model. The diffusion step controls the overall decolorization rate, and the effective diffusion coefficients varied with internal structure of the bead matrices. The diffusion coefficients were increased from 4.98 × 10(-9) to 2.25 × 10(-8) cm(2) s(-1) when PAC was added, but decreased to 6.62 × 10(-10) cm(2) s(-1) when nano-TiO2 was added. The immobilized matrices could be reused for at least three cycles but with a decreased decolorization rate, possibly due to the breakage of beads at the end of each cycle, which led to the loss of immobilized bacteria.

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Section: Discussionmentioning

confidence: 99%

Section: Adsorption Isothermsmentioning

confidence: 99%

Decolorization characteristics of a newly isolated salt-tolerant Bacillus sp. strain and its application for azo dye-containing wastewater in immobilized form

Zhang

Tang

et al. 2015

Appl Microbiol Biotechnol

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“…Chronic toxic effects due to phenols reported in humans include vomiting, difficulty in swallowing, anorexia, liver and kidney damages, headache, fainting and other mental disturbances (Calace et al 2002). While the World Health Organization (WHO) has recommended the permissible phenolic concentration of 0.001 mg/L in potable waters, the European Union (EU) has set a maximum concentration level of 0.5 lg/dm 3 of total phenols in drinking water (WHO 1963;Dursun and Tepe 2005). Moreover, the maximum permitted concentration level of phenols being 0.5-1 mg/L for industrial wastewaters (Sokol and Korpal 2004).…”

Section: Introductionmentioning

confidence: 99%

Removal of 4-chloro-2-nitrophenol occurring in drug and pesticide waste by adsorption onto nano-titanium dioxide

Mehrizad

Zare

Aghaie

et al. 2012

Int. J. Environ. Sci. Technol.

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The present study deals with removal of 4-chloro-2-nitrophenol (4C2NP) as a model contaminant from pharmaceutical and pesticide industries using titanium dioxide nanoparticles as an adsorbent. 4C2NP is recalcitrant and persistent toward biodegradation and its generation in aqueous environment during formulation, distribution and field application of pesticides is often unavoidable. Batch experiments were carried out to investigate the effect of contact time, nano-titanium dioxide dosage, initial pH, initial 4C2NP concentration and temperature on adsorption efficiency. The results showed that the adsorption capacity was increased with increasing 4C2NP concentration and temperature. Optimum conditions for 4C2NP adsorption were found to be initial pH & 2, nano-titanium dioxide dosage & 0.01 g/250 mL and equilibrium time & 1 h. Titanium dioxide nanoparticles recorded a maximum capacity of 86.3 mg/g at optimal conditions. The linear correlation coefficients of Langmuir, Freundlich and Temkin isotherms were obtained. The results revealed that the Freundlich isotherm fitted the experimental data better than the other isotherm models.

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“…In such a case, the control of micro-environmental conditions is difficult because of the resulting heterogeneity in the system. With viable cells, growth and gas evolution can lead to significant mechanical disruption of the immobilising matrix [9]. A recent innovation in immobilised cell or fixed film bioreactors is the pulsed plate bioreactor (PPBR) with immobilised cells [10].…”

Section: Introductionmentioning

confidence: 99%

Modelling and simulation of steady-state phenol degradation in a pulsed plate bioreactor with immobilised cells of Nocardia hydrocarbonoxydans

Shetty

Verma

Srinikethan

2010

Bioprocess Biosyst Eng

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A novel bioreactor called pulsed plate bioreactor (PPBR) with cell immobilised glass particles in the interplate spaces was used for continuous aerobic biodegradation of phenol present in wastewater. A mathematical model consisting of mass balance equations and accounting for simultaneous external film mass transfer, internal diffusion and reaction is presented to describe the steady-state degradation of phenol by Nocardia hydrocarbonoxydans (Nch.) in this bioreactor. The growth of Nch. on phenol was found to follow Haldane substrate inhibition model. The biokinetic parameters at a temperature of 30 ± 1 °C and pH at 7.0 ± 0.1 are μ (m) = 0.5397 h(-1), K (S) = 6.445 mg/L and K (I) = 855.7 mg/L. The mathematical model was able to predict the reactor performance, with a maximum error of 2% between the predicted and experimental percentage degradations of phenol. The biofilm internal diffusion rate was found to be the slowest step in biodegradation of phenol in a PPBR.

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

Cited by 110 publications

References 18 publications

Decolorization characteristics of a newly isolated salt-tolerant Bacillus sp. strain and its application for azo dye-containing wastewater in immobilized form

Decolorization characteristics of a newly isolated salt-tolerant Bacillus sp. strain and its application for azo dye-containing wastewater in immobilized form

Removal of 4-chloro-2-nitrophenol occurring in drug and pesticide waste by adsorption onto nano-titanium dioxide

Modelling and simulation of steady-state phenol degradation in a pulsed plate bioreactor with immobilised cells of Nocardia hydrocarbonoxydans

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