UCL logo

UCL Discovery

UCL home » Library Services » Electronic resources » UCL Discovery

Optical monitoring of particle aggregates

Gregory, J; (2009) Optical monitoring of particle aggregates. J ENVIRON SCI-CHINA , 21 (1) 2 - 7.

Full text not available from this repository.

Abstract

Methods for monitoring particle aggregation are briefly reviewed. Most of the techniques are based on some form of light scattering and may be greatly dependent on the optical properties of aggregates, which are not generally known. As fractal aggregates grow larger their density can become very low and this has important practical consequences for fight scattering. For instance, the scattering coefficient may be much less than for solid objects, which means that the aggregates can appear much smaller than their actual size by a light transmission method. Also, for low-density objects, a high proportion of the scattered light energy is within a small angle of the incident beam, which may also be relevant for measurements with aggregates.Using the "turbidity fluctuation" technique as an example, it is shown how the apparent size of hydroxide flocs depends mainly on the included impurity particles, rather than the hydroxide precipitate itself. Results using clay suspensions with hydrolyzing coagulants and polymeric flocculants under different string conditions are discussed.

Type:Article
Title:Optical monitoring of particle aggregates
Keywords:monitoring method, flocculation, turbidity fluctuation, LIGHT-SCATTERING, FLOCS, BREAKAGE
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Civil, Environmental and Geomatic Engineering

Archive Staff Only: edit this record