The Optimum Flocculation Process and Inactivation Kinetics of Lotus Leaf Water-extraction

In order to study the flocculation activity of composite flocculants(chitosan、tannin),optimize the flocculation process conditions of lotus leaf water-extraction,the dosage of flocculants,temperature and the stirring rate were examined by orthogonal experiments.The best flocculation process parameters were as follows:the dosage of chitosan was 1.071g/L;the dosage of tannin was 5.357g/L;the temperature was 30℃;the stirring rate was 60r/min,respectively.The inactivity kinetics of the flocculant experiments were established on the basis of process above.It was indicated by the results that the lotus leaf water-extraction solution had a good selection on flocculation in range of 25℃—30℃.When the temperature was higher than 30℃,the flocculation activity was descended obviously.At the same time,it was proved that the inactivity kinetics of composite flocculants agreed with the first-order inactivity kinetic model.The relation of time、temperature with the rate of flocculation and the losing rate of flavonoids were discussed,and gain the function values of kinetic parameters K and E.The method would be useful for the flocculant process design and operating condition selection of lotus leaf water-extraction.