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Characteristics of the dynamic distribution of suspended particles in the flocculation process

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Abstract

Polyaluminium chloride (PAC) synthetic water was selected as a coagulant and kaolin suspension particles as objects to be removed. Online instruments such as the turbidimeter and particle counter were employed to monitor the flocculation process online and collect test data. The aim of the experiments was to study the dynamic distribution characteristics of suspension particles in the flocculation process. The 3D flow field in the reacting vessel was also simulated at different slow stirring speeds. The experiments showed that particle collision and aggregation in the flocculation process is in compliance with the Sutherland cluster aggregation model. This study further indicated that under appropriate hydrodynamic conditions, the distribution of turbulent flow in the reactor could be improved to increase the odds of effective particle collision and restrain the breakup of formed flocs by vortex shearing force. A good flocculation effect could therefore be produced.

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Authors and Affiliations

  1. State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, China

    Jun Nan, Wei-peng He, Juan-juan Song & Gui-bai Li

Authors
  1. Jun Nan
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  2. Wei-peng He
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  3. Juan-juan Song
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  4. Gui-bai Li
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Corresponding author

Correspondence to Jun Nan.

Additional information

Project supported by the National Natural Science Foundation of China (No. 50678047), the Hi-Tech Research and Development Program (863) of China (No. 2006AA06Z305), and the National Science and Technology Project of Eleventh Five Years of China (No. 2006BAJ08B05-2)

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Nan, J., He, Wp., Song, Jj. et al. Characteristics of the dynamic distribution of suspended particles in the flocculation process. J. Zhejiang Univ. Sci. A 10, 1350–1358 (2009). https://doi.org/10.1631/jzus.A0820652

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  • DOI: https://doi.org/10.1631/jzus.A0820652

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