Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4990287 | Separation and Purification Technology | 2017 | 9 Pages |
Abstract
This work investigates the purification of juices obtained with innovative pulsed electric field treatment and alkaline pressing of sugar beet tissue. Sugar beets were first sliced into cossettes and treated by pulsed electric field (PEF) at ambient temperature with a strength of EÂ =Â 600Â V/cm and an effective duration of tPEFÂ =Â 10Â ms to electroporate cell membranes. Electroporated cossettes were then subjected to a double pressing with intermediate preliming using 0.6Â g CaO/100Â g fresh cossettes to produce mixed prelimed juice (MPJ). Alternatively, electroporated cossettes were pressed without preliming to produce non-limed raw juice (RJ). MPJ and RJ were then purified by liming-carbonation and alternatively by stirred ultrafiltration. Preliming of electroporated cossettes improves filtration and sedimentation characteristics of juices. Moreover, the overall lime quantity required for the liming-carbonation was lower for MPJ (6Â kg/m3) than for RJ (10Â kg/m3). Purified MPJ had a high purity (95.4%), low coloration (570Â IU), and low content of colloids (0.95Â g/L) and proteins (104Â mg/L). Alternatively, non-stirred and stirred ultrafiltration of centrifuged MPJ and RJ were studied using PES membranes with MWCO 10-100Â kDa. Specific resistance of deposits and ultrafiltration kinetics were evaluated, as well as the qualitative characteristics of obtained permeates and retentates. Ultrafiltration permits decreasing even more the overall quantity of lime used for MPJ purification. However, the quality of MPJ and RJ permeates was lower than the quality of the same juices purified by liming-carbonation. Results of this work show important advantages of the new sugar beet technology combining pulsed electric field treatment and alkaline pressing.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
Fouad Almohammed, Houcine Mhemdi, Eugène Vorobiev,