Degradation of formaldehyde in packed-bed bioreactor by kissiris-immobilized Ralstonia eutropha

Habibi, Alireza; Vahabzadeh, Farzaneh

doi:10.1007/s12257-012-0200-5

Cited by 21 publications

(15 citation statements)

References 36 publications

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“…The scanning electron microscopy (SEM) image of the kissiris surface before and after the immobilization process showed a uniform layer of biofilm covering the kissiris surface where the immobilization yield was about 151.4 mg cell g kissiris −1 (Figure ) . This is because bacteria prefer to grow on available surfaces rather than in the surrounding aqueous phase and the porous structure of kissiris would allow bacteria to penetrate in pores because the size of the interconnecting holes is considerably larger than the bacterial dimensions . The relatively high specific surface area (2.19 m 2 g −1 ) of kissiris provides a proper natural environment for the attachment of the cell in this study.…”

Section: Resultsmentioning

confidence: 98%

“…Among these techniques, the entrapment in a natural matrix with open pore structure is a simple and applicable technique for cell immobilization in large scale facilities. In comparison with commercial synthetic supports, kissiris is a natural volcanic rock with high porosity (~ 0.5) and specific area about 1.2–2.2 m 2 g −1 which has a very low price . Previously, this matrix had been successfully utilized in biodegradation of toxic components such as phenol and P ‐nitrophenol by Ralstonia eutropha cell …”

Section: Introductionmentioning

confidence: 99%

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Mass transfer effects on biodegradation of methylene blue by immobilized cell in a packed bed bioreactor

Habibi

Rad

2018

Asia-Pacific J Chem Eng

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Aerobic degradation of methylene blue by a pure culture of Ralstonia eutropha was studied by both freely suspended cells and kissiris‐immobilized packed bed reactors. Kissiris as a cell support matrix favored the retention of the cells in the packed bed reactor during of the methylene blue biodegradation process. The biodegradation experiments showed that the kissiris‐packed bed reactor had higher performance in removal of the dyestuff for initial concentrations equal or higher than 150 mg L−1 when compared with the freely suspended cells. To evaluate the effect of mass transfer phenomena in the immobilized system, mass balance of methylene blue for a single kissiris piece was applied to derive expressions correlating the methylene blue concentration in the bulk liquid medium and inside of the bioparticle. Kinetics studies revealed a self‐inhibitory effect of methylene blue on its biodegradation at concentrations higher than 85.76 mg L−1 in the free cell and 190.1 mg L−1 for immobilized system. The mass transfer modeling indicated the protective role of the support from cells against the inhibitory role of methylene blue is related to both external and internal mass transfer limitations in the immobilized system. In the kissiris packed bed reactor, the effectiveness value was higher than unity for initial methylene blue concentration of 150 mg L−1.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Mass transfer effects on biodegradation of methylene blue by immobilized cell in a packed bed bioreactor

Habibi

Rad

2018

Asia-Pacific J Chem Eng

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“…Then the pieces were washed with distillated water and dried at the above described conditions. The difference in weights of dried kissiris and dried bare kissiris pieces gave the weight of biomass in the bioreactor [18].…”

Section: Methodsmentioning

confidence: 99%

“…Despite of the negligible changes of kissiris-immobilized cells, the trend of the free cells content was decreased by increasing PNP initial concentration and reached to its lowest level (dry cell weight ¼ 0.012 g L À1 ) at 48.7 mg L À1 as the initial concentration of PNP. Kissiris pieces have been used in our laboratory in several studies and were found highly suitable cells support, mainly because of its unique physicochemical properties [16,18]. The likely event of the cell proliferation on the porous structure of the kissiris pieces (specific surface area equal 2.19 m 2 g À1 on the basis of the Brunauer-Emmet-Teller test), is the cells penetration (i.e., cells have relatively balanced exchange between the nutrient receive and the metabolite release).…”

Section: Co-metabolic Degradation Of Pnp and Phenolmentioning

confidence: 99%

Experimental Investigation and Kinetic Modeling of p‐Nitrophenol and Phenol by Kissiris‐Immobilized Ralstonia eutropha in a Batch Reactor

Motamedi

Habibi

Maleki

et al. 2014

CLEAN Soil Air Water

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Experimental Investigation and Kinetic Modeling of p-Nitrophenol and Phenol by Kissiris-Immobilized Ralstonia eutropha in a Batch ReactorCo-metabolic degradation of p-nitrophenol (PNP) and phenol by kissiris-immobilized Ralstonia eutropha cells was studied in a batch bioreactor operated in recycling mode (30°C, initial pH of 7.7, aeration rate of 0.5 vvm, and recycling flow rate of 25 mL min À1). Decreasing trends of specific degradation rates of phenol (q Sg ) and PNP (q Sng ) with an increase of initial PNP concentration, were mathematically modeled considering the competitive inhibition between growth and non-growth substrates and self-inhibition of non-growth substrate. A non-linear regression on the equations used in defining of q Sg , and q Sng , was used to estimate the relevant kinetic parameters. On the best fitted curve, the kinetic parameters were q max Sg ¼ 0.032, and. These parameters were used for dynamic prediction of the substrates concentration feature during co-metabolic degradation experiments.

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“…Dursun and Tepe [17] investigated and reported the effective diffusion coefficient of phenol in Ca-alginate-immobilized Ralstonia eutropha in batch system. Recently, the influence of mass transfer resistance on formaldehyde degradation in kissirisimmobilized R. eutropha has been reported [18]. Ha and his group [19] studied the diffusion characteristics of chlorferon and diethylthiophosphate in Ca-alginate gel beads.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of steady state and unsteady state mass transfer rate of Cr(VI) in immobilized Bacillus sp.

Kathiravan

Gim

Ryu

et al. 2015

Biotechnol Bioproc E

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A novel hexavalent chromium (CrVI)-removing Bacillus sp. was isolated from leather industry wastewatercontaminated soil. This potential isolate was subjected to Cr(VI) removal under free and immobilized states in a stirred batch reactor (SBR). Two biokinetic parameters, V max and K m , and the effective diffusivity (D e ) for various bead sizes were calculated from Lineweaver-Burk and Eadie-Hoftsee plots, respectively. With respect to bead size, D e decreased significantly from a maximum of 3.024 × 10 −6 cm 2 /sec in the 0.20 cm bead to 2.948 × 10 −6 , 1.775 × 10 −7 , and 1.144 × 10 −7 cm 2 /sec in the 0.40-, 0.60-and 0.80 cm beads, respectively. Additionally, steady and unsteady state modeling of diffusional mass transfer into the immobilized beads was conducted to determine the mass transfer rate as a function of time and the beads' radial profile. Furthermore, the space-time yield (STY) was modeled according to the residence time of the reactor. The reactor's STY was reasonable and could be further boosted by increasing the fractional biocatalyst.

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Degradation of formaldehyde in packed-bed bioreactor by kissiris-immobilized Ralstonia eutropha

Cited by 21 publications

References 36 publications

Mass transfer effects on biodegradation of methylene blue by immobilized cell in a packed bed bioreactor

Mass transfer effects on biodegradation of methylene blue by immobilized cell in a packed bed bioreactor

Experimental Investigation and Kinetic Modeling of p‐Nitrophenol and Phenol by Kissiris‐Immobilized Ralstonia eutropha in a Batch Reactor

Evaluation of steady state and unsteady state mass transfer rate of Cr(VI) in immobilized Bacillus sp.

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