A New Thiele's Modulus for the Monod Biofilm Model

Fang, Yuanxiang; Rao, Govind

doi:10.1016/s1004-9541(08)60075-0

Cited by 13 publications

(6 citation statements)

References 29 publications

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“…From this standpoint, the pulsed substrate injection might present an advantage over the continuous substrate feeding. Indeed, if one compares a continuous feed bioreactor with a pulsed feed system containing the same total amount of cells, the pulsed system should be characterized by a more uniform cell distribution along the reactor and therefore by a thinner biofilm, which translates into a smaller diffusional resistance in the biofilm [46][47][48]. This assumption is supported by the results of the evaluation of " e biofilm in different operational phases tested in this study.…”

Section: Cfmentioning

confidence: 81%

Chloroform aerobic cometabolism by butane-growing Rhodococcus aetherovorans BCP1 in continuous-flow biofilm reactors

Ciavarelli

Cappelletti

Fedi

et al. 2011

Bioprocess Biosyst Eng

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This work focuses on chloroform (CF) cometabolism by a butane-grown aerobic pure culture (Rhodococcus aetherovorans BCP1) in continuous-flow biofilm reactors. The goals were to obtain preliminary information on the feasibility of CF biodegradation by BCP1 in biofilm reactors and to evaluate the applicability of the pulsed injection of growth substrate and oxygen to biofilm reactors. The attached-cell tests were initially conducted in a 0.165-L bioreactor and, then, scaled-up to a 1.772-L bioreactor. Glass cylinders were utilized as biofilm carriers. The continuous supply of growth substrate (butane), which led to the attainment of the highest CF degradation rate (8.4 mg(CF) day(-1) m (biofilm surface)(-2)), was compared with four schedules of butane and oxygen pulsed feeding. The pulsed injection technique allowed the attainment of a ratio of CF mass degraded per unit mass of butane supplied equal to 0.16 mg(CF) mg (butane)(-1), a value 4.4 times higher than that obtained with the continuous substrate supply. A procedure based on the utilization of integral mass balances and of average concentrations along the bioreactors resulted in a satisfactory match between the predicted and the experimental CF degradation performances, and can therefore be utilized to provide a guideline for optimizing the substrate pulsed injection schedule.

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Section: Cfmentioning

confidence: 81%

Chloroform aerobic cometabolism by butane-growing Rhodococcus aetherovorans BCP1 in continuous-flow biofilm reactors

Ciavarelli

Cappelletti

Fedi

et al. 2011

Bioprocess Biosyst Eng

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“…The kinetic model considers similar affinities for lactose and galactose, which yields a first-order reaction model. The reaction progress with the soluble enzyme was obtained from Equation (19), while for the immobilized enzyme, the solution was obtained from Equation (20). The kinetic constants and parameters for the hydrolysis of lactose by β-galactosidase are summarized in Table 1.…”

Section: Resultsmentioning

confidence: 99%

“…The method has proved to be highly effective, but there are still no studies related to the comparison of experimental data or to its application in multisubstrate reactions. • Approximated analytical solutions [19][20][21][22][23]: While analytical solutions provide an understanding of the system with a satisfactory precision, they are usually related to one-substrate reactions. They use complex hyperbolic periodic equations, which are tedious to use and diverge from the real EF behavior as the Thiele modulus increases.…”

mentioning

confidence: 99%

Estimation of the Effectiveness Factor for Immobilized Enzyme Catalysts through a Simple Conversion Assay

Valencia

Ibáñez

2019

Catalysts

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A novel methodology to estimate the effectiveness factor (EF) of an immobilized enzyme catalyst is proposed here. The methodology consists of the determination of the productivity of both the immobilized enzyme catalyst and its corresponding soluble enzyme, plotted as a function of the reaction conversion. The ratio of these productivities corresponds to the EF estimator of the catalyst. Conversion curves were simulated in a batch reactor with immobilized enzyme and soluble enzyme for different values of the S0/KM ratio and Thiele modulus (Φ) to demonstrate this hypothesis. Two different reaction orders were tested: first-order kinetic and Michaelis–Menten-based kinetic with product inhibition. The results showed that the ratio of productivities between the immobilized and soluble enzymes followed the behavior profile presented by the EF with satisfactory agreement. This simple methodology to estimate the EF is based on routine conversion experiments, thus avoiding the exhaustive kinetic and mass transfer characterization of the immobilized enzyme catalyst.

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“…Yeast method was a way by single strain to treat wastewater, the substrate concentration was uniform and completely mixed in any time, so it was suitable for Monod model [16,17]:…”

Section: The Establishment Of Kineticsmentioning

confidence: 99%

Optimization of Conditions for Wastewater Treatment and Kinetics Establishment by Yeast

Song

Sun

et al. 2013

AMR

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Yeast SP1 was selected from the three strains to remove chemical oxygen demand (COD) in wastewater from refining part of N, 2, 3-trimethyl-2-isopropyl butanamide (WS-23). The effects of some factors on the degradation for wastewater from refining part of WS-23 were investigated and the optimum conditions for biological water treatment by yeast SP1 were obtained through orthogonal experiments. The results indicate that this wastewater can be treated directly by yeast without any pre-treatment and the best conditions are as follows: inoculum is 10% (v/v), reaction temperature at 30 °C for 48 h. Under these conditions, the total COD removal efficiency can reach 87.11%. In addition, according to Monod model, the kinetics parameters were obtained from the experiments by determining influent COD (S0), effluent COD (Se), biomass (X) and the kinetics of COD removal was established, furthermore, the difference of experimental and calculated values was within 1 hour by testing.

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A New Thiele's Modulus for the Monod Biofilm Model

Cited by 13 publications

References 29 publications

Chloroform aerobic cometabolism by butane-growing Rhodococcus aetherovorans BCP1 in continuous-flow biofilm reactors

Chloroform aerobic cometabolism by butane-growing Rhodococcus aetherovorans BCP1 in continuous-flow biofilm reactors

Estimation of the Effectiveness Factor for Immobilized Enzyme Catalysts through a Simple Conversion Assay

Optimization of Conditions for Wastewater Treatment and Kinetics Establishment by Yeast

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