Syrup Clarification Using Flotation System with Optimized Dosages of Phosphate and Cationic Flocculant
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Date
2018-05
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
AAU
Abstract
Syrup is a clarified juice evaporated to approximately 65% dry solids in a stepwise
evaporation process. This concentrated syrup is needed to clarify further before the final
fractionation. All Ethiopian sugar factories are designed for the production of plantation
white sugar (PWS) by double sulphitation system which is the main source of an increased
residual sulphur dioxide in the final product. There is a significant interest in many sugar
producing countries towards producing a higher quality plantation white sugar with lower
color and lower residual sulphur dioxide content. A sugar with a lower color and lower
residual sulphur dioxide values is achieved by replacing the syrup sulfitation process with
syrup phosphatation and flocculation. The study was conducted to optimize the syrup
clarification as the result of the effect of Talodura and Phosphate on reducing color,
turbidity and viscosity using flotation system and there by modifying or reducing the sulfate
content in the sugar. This increased sulfate is due to syrup double salfitation during syrup
clarification at Wonji Sugar Factory. Since degree of clarification is dependent on the dose
of Phosphate and Talodura flocculant, optimization of the doses was carried out against
color, turbidity and reduction of viscosity. Design Expert 7 and JMP13 software were used
to determine the common optimum doses. The range of levels of the P
2
O
5
used was 117.8 -
680 mg/L, and that of the Talodura was 7.2 - 12.8 mg/L. The optimum levels, 668 mg/L of
P
2
O
5
and 12 mg/L of Talodura gave color and turbidity values of 9772 and 4669 ICUMSA
respectively and a viscosity reduction of 39 %. Practicing the above optimum conditions at
Wonji Sugar Factory could increase productivity and sugar quality.
Description
Keywords
Color, Phosphate, Syrup clarification, Talodura, Turbidity, Viscosity