Purification of Brown Cane Sugar Solutions by Ultrafiltration with Ceramic Membranes: Investigation of Membrane Fouling
| Autor: | M. Y. Jaffrin, S. Jacob |
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| Rok vydání: | 2000 |
| Předmět: | |
| Zdroj: | Separation Science and Technology. 35:989-1010 |
| ISSN: | 1520-5754 0149-6395 |
| DOI: | 10.1081/ss-100100206 |
| Popis: | This paper describes the purification and decoloration of brown cane sugar solutions by ultrafiltration with multichannel 2.5 mm inner diameter ceramic membranes of 15 kDa cutoff. Filtration tests were carried out at concentrations of 30, 40, and 50°Brix, a temperature of 60°C, and 3 and 5 m/s velocities. The permeate flux at 100 kPa decays continuously during 8 hours, reaching at the end 20 L/h·m2 at 30°Bx and 6 L/h·m2 at 50°Bx. Higher fluxes were obtained at 300 kPa. The permeate coloration stabilized at 1000 I.U. (ICUMSA units) from a retentate at 2400 I.U., representing a 58% decoloration rate. A comparison was made with microfiltration using a 0.1-μm ceramic membrane. The permeate flux in this case was much higher, decaying from 140 to 100 L/h·m2 in 8 hours for 30°Bx. In order to reduce membrane fouling, other ultrafiltration tests were performed by superimposing velocity and pressure pulsations of 1 Hz frequency at the membrane inlet. A gain in permeate flux became significant (20%) after 3 hours of... |
| Databáze: | OpenAIRE |
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