Modelling of aggregation processes

Elimelech, Menachem; Gregory, John; Jia, Xiaodong; Williams, Richard A

doi:10.1016/b978-075067024-1/50006-6

Cited by 254 publications

(498 citation statements)

References 52 publications

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“…It is well known that the amount of polymer flocculant adsorbed onto colloidal particles profoundly affects the stability of the colloidal suspension (Fleer and Lyklema, 1974;Ash and Clayfield, 1976;Gregory and Barany, 2011). To explain the flocculation mechanism, several models of bridging between two or more particles by adsorbed polymers have been proposed (Smellie and La Mer, 1958;Healy and La Mer, 1964;Sakohara et al, 1980;Hogg, 1984;Moudgil et al, 1987;Molski, 1989;Elimelech et al, 1995). La Mer and co-workers (Smellie and La Mer, 1958;Healy and La Mer, 1964) expressed bridging flocculation in terms of the fraction of the surface covered by adsorbed polymer.…”

Section: Introductionmentioning

confidence: 99%

Effect of Intermittent Addition on Turbidity Removal by Polymer Flocculant: Computer Simulation of Simplified Flocculation Model

Kadooka

Miyajima

Tanaka

et al. 2018

J. Chem. Eng. Japan / JCEJ

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Since there are many factors which in uence the process of occulation by polymer occulant, the scienti c understanding of the occulation mechanism is still under discussion. We have proposed a simple bridging model which expresses occulation under various additive manners of the occulant and enables the understanding of qualitative trends of the occulation system. In the present study, from the simulated results based on the model and experimental data, we obtained the following knowledge: 1) the intermittent addition of polymer occulant gives better and reproducible turbidity removal; 2) the optimum dosage, which results in maximum turbidity removal in a given manner of addition, increases as the number of doses under the intermittent addition increases; 3) at a given amount of primary particles, the reproducibility at the optimum dosage of the 1-time dose is the worst among all results, irrespective of the additive manner. It could, therefore, be concluded that all these ndings are originating from the di erence of probability of bridging formation among particles under various additive manners.

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Section: Introductionmentioning

confidence: 99%

Effect of Intermittent Addition on Turbidity Removal by Polymer Flocculant: Computer Simulation of Simplified Flocculation Model

Kadooka

Miyajima

Tanaka

et al. 2018

J. Chem. Eng. Japan / JCEJ

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“…Upon infiltration into the ground, in contact with soil and mixing with soil and groundwater, this signature may start to change, affecting the transportability of FBPs. Water chemistry parameters such as pH and salt concentration are well known to affect particle transport in porous media (e.g., [11][12][13][14][15][16]). While water chemistry can vary strongly for different fires and extinguishing operations, it is important to understand how these parameters influence the particle mediated contaminant transport and ultimate fate of the fire-generated contamination.…”

Section: Introductionmentioning

confidence: 99%

Fate and Transport of Fire-Born Particles in Porous Media

et al. 2015

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Abstract:A variety of hazardous substances may be generated from the burning materials during fire extinguishing operations, depending on the location, type, and place of the fire. As a result, the fire-extinguishing water may act as a carrier for these nano-and micro-sized fire-born particles, including various types of associated contaminants, and may cause contamination of soil and groundwater resources. While airborne particles from fires have been studied, it is currently not well known what types of nano-and micro-sized contaminants are typically carried by the fire-extinguishing water and how these contaminants can be transported in the natural environment. The main purpose of this study was to increase the understanding about the occurrence and physical and chemical properties of nanoparticles commonly found in discharge water from fire extinguishing operations. The current study was based on collection of original samples from a fire location. A detailed characterization of the particles present in the extinguishing water was performed including both quantification of contaminants associated with the particles (such as metals and polycyclic aromatic hydrocarbons (PAHs) as well as measurement of properties related to the mobility of these particles through porous media. Such mobility properties include size distributions of the particles and the porous media, surface charges and solution chemistry). Results indicate that metals and PAHs are present in both finer and relatively larger fire-born particles. The particles larger than 11 µm were not mobile in porous media. The mobility of the finer particles (<11 µm) was generally high but was dependent on the solution chemistry. Low mobility of large particles in porous media indicates that a large amount of the contamination can likely be trapped in the top soil layer even though the fire extinguishing water infiltrates.

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“…We confirmed experimentally that a dispersion liquid of silver nanoparticles changes its color gradually due to aggregation when LED light at the plasmon resonance frequency impinges. Approaches that induce aggregation of the particles can be roughly divided into two categorieschemical and non-chemical methods [7]. Our interest, in this study, is in a non-chemical approach that uses the Lorentz force generated by light irradiation behaving as a dominant attracting force between the particles positioned at some distance each other [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Precise Finite Difference Analysis of Lorentz Force Acting on Metal Nanoparticle Irradiated With Light

Yamaguchi¹,

Ebisawa²,

Ohnuki³

2017

PIER C

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Abstract-A finite difference method in the frequency domain is evaluated to clarify characteristics of the Lorentz force exerted on a metal nanoscale particle by light irradiation. Numerical results are compared with exact values obtained from Mie theory to show that applying a smoothing algorithm to the surface of a nanoparticle increases the accuracy of the simulation. Analysis of the Lorentz force exerted between two spheres aligned closely indicates that strong forces cause the spheres to attract each other at the plasmon resonant frequency. It was also noticed that application of the smoothing algorithm was indispensable in order to achieve the above result.

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Modelling of aggregation processes

Cited by 254 publications

References 52 publications

Effect of Intermittent Addition on Turbidity Removal by Polymer Flocculant: Computer Simulation of Simplified Flocculation Model

Effect of Intermittent Addition on Turbidity Removal by Polymer Flocculant: Computer Simulation of Simplified Flocculation Model

Fate and Transport of Fire-Born Particles in Porous Media

Precise Finite Difference Analysis of Lorentz Force Acting on Metal Nanoparticle Irradiated With Light

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