Abstract
Based on laboratory trials on the optimal flocculating point, in which the variation of this command variable of the juice purification was demonstrated, a prototype for the automated determination was constructed. A measurement system, which is operated in the bypass of the industrial production, is used for an automatic stepwise carbonatation of main liming juice. Starting at pH = 11.2 carbonatation gas is injected to bring down the pH to 10.4 in 0.1 or 0.2 pH units per step. After every pH step, the sedimentation behavior of the juice is characterized by means of a turbidity measurement after a clarification time of 3.5 min. With the function of turbidity versus pH value the optimal end point of the1st carbonatation can be determined. All in all an analysis takes approximately 60 min. Afterwards, an automated cleaning step takes place. For the prototype, the control of every step as well as the interpretation of the results is carried out with a personal computer. Based on the good experiences a so-called industrial version of this measurement system was constructed.
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