Abstract
Ultrafiltration of polysaccharide macromolecule has been carried out in a stirred batch cell using a fully retentive membrane over a wide range of operating conditions. An unsteady state mass transfer model in conjunction with resistance-in-series model is developed using film theory. The proposed model is used to predict the transient permeate flux decline behavior in gel controlled ultrafiltration. This model is also able to quantify the variation of bulk volume as well as the bulk concentration of solute with time. The variation of viscosity as a function of solute concentration is included in the model. A model parameter is used in this model and is evaluated by optimizing the experimental flux profiles with calculated flux profiles. The model predictions are successfully compared with the experimental data. A parametric study has been performed to observe the effect of different process parameters on the filtration performance in terms of transient permeate flux decline behavior. The proposed model in general will provide a better understanding of gel controlled ultrafiltration.
Abbreviations
- A :
-
Effective membrane area, square meters
- a :
-
Parameter used in Eq. 19, dimensionless
- C :
-
Concentration of pectin, kilograms per cubic meter
- d p :
-
Equivalent diameter, meters
- D :
-
Diffusivity of pectin, square meters per second
- K :
-
Boltzmann constant (1.38 × 10−23), joules per Kelvin
- k :
-
Mass transfer coefficient, meters per second
- L :
-
Gel layer thickness, meters
- M ω :
-
Molecular weight, kilograms per kilogram-mole
- N total :
-
Total number of data points, dimensionless
- Pe w :
-
Water flux, dimensionless
- \( Pe_{\mathrm{w}}^0 \) :
-
Pure water flux, dimensionless
- R :
-
Radius of stirred cell, meters
- R m :
-
Membrane hydraulic resistance, per meter
- R g :
-
Gel layer resistance, per meter
- Re :
-
Reynolds number at the bulk condition
- Sc b :
-
Schmidt number at the bulk condition
- Sh :
-
Sherrod number at the bulk condition
- T :
-
Absolute temperature, degrees Kelvin
- t :
-
Time of experiment, seconds
- V :
-
Volume, cubic meters
- J :
-
Permeate flux, cubic meters per square meter-second
- J exp :
-
Experimental permeate flux, cubic meters per square meter-second
- J cal :
-
Calculated permeate flux, cubic meters per square meter-second
- y :
-
Coordinate from the membrane, meters
- z :
-
Parameter in Eq. 13, kilograms per kilomole-cubic meter
- ν :
-
Parameter used in Eq. 4, dimensionless
- α 1 :
-
Specific gel layer resistance, meters per kilogram
- ω :
-
Angular speed of stirring, radian per second
- μ :
-
Viscosity of the solution, Pascal-second
- δ g :
-
Gel layer thickness, meters
- δ c :
-
Thickness of concentration boundary layer, meters
- ε g :
-
Gel porosity, dimensionless
- ΔP :
-
Transmembrane pressure, kilopascals
- ρ g :
-
Gel density, kilograms per cubic meter
- ρ :
-
Density, kilograms per cubic meter
- τ total :
-
Total operation time, dimensionless
- τ :
-
Operation time, dimensionless
- 0:
-
Initial condition
- b:
-
Bulk condition
- p:
-
Permeate
- f:
-
Feed
- g:
-
Gel
- *:
-
Dimensionless
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Appendix
Appendix
Viscosity: Viscosity of various pectin solutions at normal pH and at 25 °C is experimentally measured and can be expressed by the following polynomial (correlation coefficient 0.997) as follows:
Where, μ is in Pasacl-second and C is in kilograms per cubic meter.
Density: Density of pectin solution has been taken as 1,000 kg/m3.
Diffusivity: Diffusivity of pectin solution at feed concentration of 1, 3, and 5 kg/m3 are calculated using Eq. 12 and are found to be 7.25 × 10−11, 4.6 × 10−11, 3.2 × 10−11 m2/s, respectively.
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Sharma, P., Sarkar, B. Prediction of Permeate Flux During Ultrafiltration of Polysaccharide in a Stirred Batch Cell. Food Bioprocess Technol 6, 3634–3643 (2013). https://doi.org/10.1007/s11947-012-0990-7
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DOI: https://doi.org/10.1007/s11947-012-0990-7