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Abstract
Abstract
Sugar production from sugar cane juice is an industry with great economical and technical importance for Egypt. The technology simply involves milling, clar evaporation, and crystallization of sugar cane juice. Clar and decolorization are classically achieved by defecation, suiphitation, phosphatation, carbonation, etc. of sugar juice. Most existing technologies utilize many chemicals, which are not only polluting, but also affect the quality of the sugar product. Sugar industry has to accommodate itself with the new environmental regulations and to upgrade the quality of sugar with optimizing the production cost using new techniques such as membrane filtration.
The present thesis explores the prospect of employing crossflow microfiltration and ultrafiltration for cane juice clar in the Egyptian sugar industry. In the present work, an experimental study is carried out in order to examine the effect of a group of parameters not only on the flux decline but also on the quality (such as purity, turbidity and color) of the processed juice. The parameters considered include the type of membrane (different molecular weight cut off MWCO), inlet pressure and inlet temperature. To this end, a test rig is designed and constructed during this study where mixed juice and limed mixed juice is processed in batch operation. The heart of the test rig is a DSS Labstak ® Ml 0 crossflow microjIltration and ultrafiltration module.
The present study shows that the juice is free of turbidity for all the tested membranes. The permeate color is comparable with that resulted from conventional sulphitalion process. The statistical analysis of the experimental results suggested that there is no sign effects of the studied parameters on the color of permeate except for the type of membrane. None of the studied parameters show effect on turbidity, which has been eliminated within 30 minutes in every condition. It was observed that the permeate flux obtained is increased as the transmembrane pressure is increased for all the membranes considered in this study. Moreover, permeate flux has been increased as the feed temperature is increased.