Pilot-scale press electrofiltration of biopolymers

Hofmann, Ralph; Käppler, Tobias; Posten, Clemens

doi:10.1016/j.seppur.2006.01.015

Cited by 30 publications

(24 citation statements)

References 17 publications

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“…Electroosmotic dewatering is an assisted filtration technique that can be used to increase the solid content of suspensions of materials with charged surfaces (Iwata et al 2013;Mahmoud et al 2010). It has proved to be useful in increasing the solid content of cellulosic materials with high specific surface areas (Wetterling et al 2017a), such as microfibrillated cellulose suspensions (Heiskanen et al 2014), and has also shown potential for use in the dewatering of both biopolymers (Gözke and Posten 2010;Hofmann et al 2006;Hofmann and Posten 2003) and hydrogels (Tanaka et al 2014). Using electroosmotic dewatering prior to drying can decrease the total energy demand of the dewatering operation (Larue et al 2006;Loginov et al 2013;Mahmoud et al 2011) and is therefore also attracting significant research interest in the treatment of wastewater sludge (Citeau et al 2012;Mahmoud et al 2011;Olivier et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Electroosmotic dewatering of cellulose nanocrystals

et al. 2018

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One of the main challenges for industrial production of cellulose nanocrystals is the high energy demand during the dewatering of dilute aqueous suspensions. It is addressed in this study by utilising electroosmotic dewatering to increase the solid content of suspensions of cellulose nanocrystals. The solid content was increased from 2.3 up to 15.3 wt%, i.e. removal of more than 85% of all the water present in the system, at a much lower energy demand than that of thermal drying. Increasing the strength of the electric field increased not only the dewatering rate but also the specific energy demand of the dewatering operation: the electric field strength used in potential industrial applications is thus a trade-off between the rate of dewatering and the energy demand. Additionally, it was found that high local current intensity had the potential of degrading cellulose nanocrystals in contact with the anode. The maximum strength of the electric field applied should therefore be limited depending on the equipment design and the suspension conditions.

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Section: Introductionmentioning

confidence: 99%

Electroosmotic dewatering of cellulose nanocrystals

et al. 2018

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“…Earlier study suggested that hydrodynamic shear reduces Xanthan's viscosity due to Xanthan's shear-thinning behavior, 4 thus minimising gel layer formation. Higher CFV, which was optimum at level 2, might have reflected this effect.…”

Section: Effect Of Cfvmentioning

confidence: 99%

“…2,3 The potential substitute for conventional method of Xanthan recovery is membrane filtration. Previously, ultrafiltration (UF) was used to dewater and concentrate Xanthan solution, 4 whereas electrofiltration was used to concentrate Xanthan by electrophoretic effect. 5 In fact, membrane filtration is already common in the recovery and purification of other bioproducts, such as surfactin (biosurfactant), 6 fumaric acid, 7 alginate, 8 penicillin G 9 and enzymes.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Xanthan Gum from Palm Oil-Based Fermentation Broth by Diafiltration with Flat Polysulfone Microfiltration (MF) Membrane

So'aib¹

2014

Chem.Biochem.Eng.Q.

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Xanthan gum recovery from palm oil-based broth by diafiltration was carried out using flat microfiltration (MF) membrane. Optimization of process parameters such as transmembrane pressure (TMP), crossflow velocity (CFV), ionic strength (IS) and diafiltration factor (DF) was performed by Taguchi method using signal-to-noise (S/N) ratio of larger-the-better criterion yielding the following optimum conditions: level 1, level 2, level 3, and level 2, respectively, corresponding to Xanthan recovery of 68 %. Analysis of variance (ANOVA) showed the significance of TMP on providing a driving force for Xanthan's transmembrane transport (XTT), whereas little effect of DF indicated the evidence of sieving action by cake layer on XTT, which was also responsible for complete rejection of oil indicated by the absence of fatty acid component in permeate upon GC-MS analysis. On the contrary, better XTT was observed during MF operation on zero-oil broth due to absence of oily cake layer rendering CFV more effective.

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“…Isopropanol gave maximum precipitation of pullulan followed by ethanol and tetrahydrofuran [25]. In current processes for production of xanthan, it is concentrated by precipitation with isopropanol [26]. The FDA regulations for preparation of good grade xanthan gum prescribe the use of isopropanol for precipitation [14].…”

Section: Effect Of Isopropanol Reaction Time and Temperature On Recmentioning

confidence: 99%

Application of statistical experimental design for optimization of downstream process for recovery of pullulan produced by Aureobasidium pullulans HP-2001

Kim

Lee

Gao

et al. 2011

Korean J. Chem. Eng.

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The optimal conditions of the downstream process for recovery of pullulan produced by Aureobasidium pullulans HP-2001 were examined using response surface method (RSM). The optimal amount of diatomite in filter press and the optimal flow rate in a continuous flow centrifuge for removal of cells from the culture broth of A. pullulans HP-2001 were found to be 5.0% (v/v) and 2.0 L/min. Based on central composite design (CCD) experiments and analysis of variance (ANOVA) indicated that the optimal conditions for recovery of pullulan from the supernatant by precipitation were the volume ratio of ethanol (or isopropanol) to supernatant of 3.0 : 1.0, the reaction time of 29.5 h, and the reaction temperature of 20.2 o C. The expected maximal recovery yields of pullulan using ethanol and isopropanol under optimized conditions were 79.2 and 85.5%, respectively.

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Pilot-scale press electrofiltration of biopolymers

Cited by 30 publications

References 17 publications

Electroosmotic dewatering of cellulose nanocrystals

Electroosmotic dewatering of cellulose nanocrystals

Recovery of Xanthan Gum from Palm Oil-Based Fermentation Broth by Diafiltration with Flat Polysulfone Microfiltration (MF) Membrane

Application of statistical experimental design for optimization of downstream process for recovery of pullulan produced by Aureobasidium pullulans HP-2001

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