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Bio-degradation of Phenol in Wastewater by Enzyme-loaded Membrane Reactor: Numerical Approach
Seung-Hak CHOI,Francesco SCURA,Giuseppe BARBIERI,Rosalinda MAZZEI,Lidietta GIORNO,Enrico DRIOLI,Jeong-Hoon KIM 한국막학회 2009 멤브레인 Vol.19 No.1
A mathematical model was written for simulating the removal of phenol from wastewater in enzyme-loaded membrane reactor (EMR). The numerical simulation program was developed so as to predict the degradation of phenol through an EMR. Numerical model proves to be effective in searching for optimal operating conditions and creating an optimal microenvironment for the biocatalyst in order to optimize productivity. In this study, several dimensionless parameters such as Thiele Modulus (Φ2, dimensionless Michaelis-Menten constant (ξ), Peclet number (Pe) were introduced to simplify their effects on system efficiency. In particular, the study of phenol conversion at different feed compositions shows that low phenol concentrations and high Thiele Modulus values lead to higher reactant degradation.
A Pd Doped PVDF Hollow Fibre for the Dissolved Oxygen Removal Process
Batbieri G.,Brunetti A.,Scura F.,Lentini F.,Agostino R G.,Kim, M.J.,Formoso V.,Drioli E.,Lee, K.H. The Membrane Society of Korea 2006 Korean Membrane Journal Vol.8 No.1
In semiconductor industries, dissolved oxygen is one of the most undesirable contaminants of ultrapure water. A method for dissolved oxygen removal (DOR) consists in the use of polymeric hollow fibres, loaded with a catalyst and fed with a reducing agent such as hydrogen. In this work, PVDF hollow fibres loaded with Pd were characterized by means of perporometry, scanning electron microscopy (SEM), energy dispersive X-ray (EDX). The hollow fibre analyzed shows a five-layer structure with remarkable morphological differences. An estimation of pore diameters and their distribution was performed giving a mean pore diameter of 100 nm. The permeance and selectivity of the fibres were measured using $H_2,\;N_2,\;O_2$ as single gases, at different operating conditions. An $H_2$ permeance of $37 mmol/m^2s$ was measured and $H_2/O_2$ and $H_2/N_2$ selectivities of ca. 3 were obtained. $H_2$ permeance was 1/3 when a water stream flows in the shell side. Catalytic fibrebehaviour was simulated using a mathematical model for a loop membrane reactor, considering only $O_2$ and $H_2$ diffusive transport inside the membrane and their catalytic reaction. Dimensionless parameters such as the Thiele modulus are employed to describe the system behaviour. The model agrees well with the experimental reaction data.
Bio-degradation of Phenol in Wastewater by Enzyme-loaded Membrane Reactor: Numerical Approach
Barbieri, Giuseppe,Choi, Seung-Hak,Scura, Francesco,Mazzei, Rosalinda,Giorno, Lidietta,Drioli, Enrico,Kim, Jeong-Hoon The Membrane Society of Korea 2009 멤브레인 Vol.19 No.1
A mathematical model was written for simulating the removal of phenol from wastewater in enzyme-loaded membrane reactor (EMR). The numerical simulation program was developed so as to predict the degradation of phenol through an EMR. Numerical model proves to be effective in searching for optimal operating conditions and creating an optimal microenvironment for the biocatalyst in order to optimize productivity. In this study, several dimensionless parameters such as Thiele Modulus (${\phi}^2$, dimensionless Michaelis-Menten constant ($\xi$), Peclet number (Pe) were introduced to simplify their effects on system efficiency. In particular, the study of phenol conversion at different feed compositions shows that low phenol concentrations and high Thiele Modulus values lead to higher reactant degradation.