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Comparison of batch, fed-batch and continuous well-mixed reactors for enzymatic hydrolysis of orange peel wastes

Paper ID Volume ID Publish Year Pages File Format Full-Text
34765 45047 2012 7 PDF Available
Title
Comparison of batch, fed-batch and continuous well-mixed reactors for enzymatic hydrolysis of orange peel wastes
Abstract

An alternative potential feedstock for bioethanol in the automotive sector is citrus peel waste (CPW), which can be processed through enzymatic hydrolysis and fermentation. The present work considers mathematical modeling of orange peel wastes (OPW) hydrolysis with the use of free enzymes and compares the performance of batch, fed-batch and continuous well-mixed reactors after introducing appropriate rate equations in dynamic mass balances. MATLAB® was used for model implementation.Following the Michaelis–Menten approach, the authors used their own kinetic parameters for the pectin hydrolysis rate equation. The parameters were generated in an apposite experimental program for OPW hydrolysis to galacturonic acid with consideration of product inhibition; the corresponding values were obtained after Lineweaver–Burk linearization and are: rmax = 0.28 g/(L min), Km = 19.80 g/L and KIGA = 6.96 g/L, respectively. Vice-versa, the authors adopted the Kadam's group kinetic schemes and parameters for cellulose hydrolysis to cellobiose and glucose. The mathematical model of a well-mixed batch reactor was perfectly validated against the experimental results of OPW hydrolysis to galacturonic acid. In the case of a continuous well-mixed reactor, high dilution rates determine low conversion of OPW. The increased complication of fed-batch operation does not add advantages when compared to batch processing.

Keywords
Enzymatic hydrolysis; Mathematical modeling; Citrus peel waste; Batch; Fed-batch; Continuous well-mixed reactor
First Page Preview
Comparison of batch, fed-batch and continuous well-mixed reactors for enzymatic hydrolysis of orange peel wastes
Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 47, Issue 11, November 2012, Pages 1588–1594
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering