Aquatic environment

Impact of dynamic distribution of floc particles on flocculation e ect

NAN Jun , HE Weipeng , SONG Xinin , LI Guibai


Received September 11, 2008,Revised December 17, 2008, Accepted , Available online

Volume 21,2009,Pages 1059-1065

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Polyaluminum chloride (PAC) was used as coagulant and suspended particles in kaolin water. Online instruments including turbidimeter and particle counter were used to monitor the flocculation process. An evaluation model for demonstrating the impact on the flocculation e ect was established based on the multiple linear regression analysis method. The parameter of the index weight of channels quantitatively described how the variation of floc particle population in di erent size ranges cause the decrement of turbidity. The study showed that the floc particles in di erent size ranges contributed di erently to the decrease of turbidity and that the index weight of channel could excellently indicate the impact degree of floc particles dynamic distribution on flocculation e ect. Therefore, the parameter may significantly benefit the development of coagulation and sedimentation techniques as well as the optimal coagulant selection.

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