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Light scattering:A review of particle characterization applications

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Particuology 2015年第1期13卷 11-21页

作者： Renliang Xu Micromeritics Instrument Corporation

This review covers the progress of light scattering applications in the field of particle characterization in the past decade. The review addresses static light scattering （the measurement of scattering intensities due to light-particle interaction at various spatial locations）, dynamic light scattering （the measurement of scattering due to light-particle interaction as a function of time）, and scattering tracking analysis （the tracking of particle movement through scattering measurement）.

关键词： Dynamic light scattering particle tracking analysis Electrophoretic light scattering Laser diffraction particle counter Self-mixing laser spectroscopy

Impact of dynamic distribution of floc particles on flocculation effect

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Journal of Environmental Sciences 2009年第8期21卷 1059-1065页

作者： NAN Jun, HE Weipeng, SONG Xinin, LI Guibai State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China. State Key Laboratory of Urban Water Resource and Environment School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China

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 effect 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 different size ranges cause the decrement of turbidity. The study showed that the floc particles in different size ranges contributed differently 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 effect. Therefore, the parameter may significantly benefit the development of coagulation and sedimentation techniques as well as the optimal coagulant selection.

关键词： particle size distribution particle counter index weight flocculation process

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

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第9期10卷 1350-1358页

作者： Jun NAN Wei-peng HE Juan-juan SONG Gui-bai LI State Key Laboratory of Urban Water Resource and Environment School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China

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.

关键词： Suspension particle particle counter Flocculation process Dynamic distribution

Fractal Characteristics of particle Size Distribution in Dynamic Flocculation Process

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Wuhan University Journal of Natural Sciences 2009年第6期14卷 511-517页

作者： NAN Jun, HE Weipeng, ZHANG Zhijun, LI Guibai State Key Laboratory of Urban Water Resource and Environment/School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China State Key Laboratory of Urban Water Resource and Environment/School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin China

This study selected polyaluminum chloride（PAC） coagulant to remove suspended particles in Kaolin suspension solution and used a turbidimeter and particle counter to monitor the flocculation process online and collected the experiment data. The experiments were conducted to study the dynamic distribution characteristics of suspended particles under different hydrodynamic conditions. The results show the self-similarity and scale invariance of particle size distribution. The study further proposed the concept of fractal dimension of particle size distribution and found out that fractal dimension changed in a similar way as residual turbidity did and could excellently indicate the variation of coagulation effect. Therefore, fractal dimension could be adopted to optimize the addition of coagulants and the quality of outflow could be further improved to reduce production costs.

关键词： flocculation particle size distribution fractal dimension particle counter