Concentration of Rutin Model Solutions from Their Mixtures with Glucose Using Ultrafiltration

Separation of polyphenolic phytochemical compounds from their mixtures with sugars is necessary to produce an added-value sugar-reduced extract with high biological activity from fruit juice processing industry waste streams. The separation characteristics of a binary mixture of rutin and glucose using a Pellicon-2 regenerated cellulose ultrafiltration membrane with an area of 0.1 m2 having nominal MWCO of 1,000 Da were investigated, to demonstrate the separation of phenolic compounds from sugars. The effects of the operating variables–transmembrane pressure, feed solution temperature and pH, initial feed concentration and feed flow rate–on the permeate flux and enrichment of rutin, were determined. The permeate flux increased with the increase in transmembrane pressure up to a certain limit and after that the flux remained more or less constant. The optimum transmembrane pressure was within 4–5 bar. The flux increased with the increase in feed solution temperature because of reduced feed viscosity, and better solubility. The concentration of rutin was optimum at lower temperature (30°C), with an enrichment factor of 1.3. The effect of pH on permeate flux was less obvious. Lowering the feed solution pH increased the retention of rutin and the optimum separation was obtained within pH 3–4. The permeate flux decreased with the increase in feed concentration of rutin (concentration range 0.1–0.5 g/L). The enrichment of rutin was significant in the glucose concentration range 0.35–0.5 g/L. The feed flow rate had a significant effect on the flux and separation characteristics. Higher cross-flow through the membrane reduced the fouling by providing a shear force to sweep away deposited materials from the membrane surface. At high feed flow rate, more rutin was retained by the membrane with less sugar permeating through. The optimum feed flow rate was 1.5 L/min. For the separation of rutin (in the retentate) and glucose (in the permeate), the best results were obtained at rutin enrichment of 2.9 and recovery 72.5%, respectively. The performance of this system was further improved by operating it in a diafiltration mode, in which only approx. 11% of glucose remained in the retentate

Maitrise du colmatage des fibres creuses en polysulfone : pretraitement de floculation sur une eau a potabiliser par ultrafiltration

SIGLECNRS T Bordereau / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

A new process to remove halogenated VOCs for drinking water production: vacuum membrane distillation

International audienc

Méthodes de détection de Cryptosporidium dans l'eau : Revue et application à l'analyse d'eaux usées au laboratoire

Cryptosporidium a été retrouvé dans différents types d'eaux (usées, surface, traitées) à des concentrations et des taux d'isolement conséquents. De plus, il affiche une résistance très importante vis-à-vis des différents systèmes utilisés dans les stations de traitement et les différents modes de désinfection appliqués dans les réseaux. Le contrôle de Cryptosporidium dans les eaux est donc ressenti aujourd'hui comme un impératif notoire. Une revue de la littérature a été réalisée à propos des techniques appropriées aux différents types d'eaux et aux mises en évidence de ce protozoaire dans l'eau potable. Une application a été développée dans le cadre de la recherche de Cryptosporidium à partir d'eaux usées par filtration sur cartouche de polypropylène