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Coagulation

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...

Colloids and Suspensions

Colloids and Suspensions

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...

Colloidal precipitates

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

Centrifugation

Centrifugation

Centrifugation is a separation technique based on differences in density or size. It is commonly used to separate solids from aqueous interferents. During centrifugation, the sample is placed in centrifugation tubes and spun at high angular velocity, which allows centrifugal force to act differentially on the different densities or masses of the components. After spinning, the supernatant liquid is decanted. Depending on the specific application, either the pellet or the supernatant is retained...

Colloids

Colloids

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...

Typical Model Studies

Typical Model Studies

Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.

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Related Experiment Video

Updated: Jun 23, 2026

Determination of the Settling Rate of Clay/Cyanobacterial Floccules

Determination of the Settling Rate of Clay/Cyanobacterial Floccules

Published on: June 11, 2018

Simulation of coagulation, flocculation, and sedimentation.

L Smoczynski¹, Z Bukowski, R Wardzynska

¹University of Warmia and Mazury Olsztyn, Olsztyn, Poland.

Water Environment Research : a Research Publication of the Water Environment Federation

|May 19, 2009

Summary

The ZB2 computer program simulated soil coagulation and flocculation, aligning with practical conditions for initial particle velocity. However, simulated coagulant excess unexpectedly slowed coagulation, diverging from real-world observations.

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A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

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Last Updated: Jun 23, 2026

Determination of the Settling Rate of Clay/Cyanobacterial Floccules

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Procedure to Evaluate the Efficiency of Flocculants for the Removal of Dispersed Particles from Plant Extracts

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Published on: February 14, 2017

Area of Science:

Environmental Engineering
Water Treatment Technologies
Computational Fluid Dynamics

Background:

Coagulation, flocculation, and sedimentation are critical processes in water and wastewater treatment.
Understanding the kinetics and influencing factors of these processes is essential for optimizing treatment efficiency.
Computer simulations offer a valuable tool for studying complex environmental engineering phenomena.

Purpose of the Study:

To investigate the simulated effects of initial soil particle velocity on reaction-rate constants during coagulation.
To assess the impact of coagulant concentration (excess/deficiency) on early-stage floc formation and overall coagulation rate.
To evaluate the performance of the ZB2 simulation program against established coagulation-flocculation theory and practical observations.

Main Methods:

Utilized the ZB2 computer program for simulating coagulation, flocculation, and sedimentation processes.
Analyzed the influence of varying initial soil particle velocities on reaction-rate constants.
Estimated the effects of coagulant excess and deficiency on initial floc development and 50% soil coagulation rates.

Main Results:

Simulated reaction-rate constants correlated well with coagulation theory and practical conditions concerning initial particle velocity.
An increase in simulated coagulant excess led to a decrease in the simulated soil coagulation rate.
This finding regarding coagulant excess contradicted real-world coagulation observations, prompting theoretical analysis.

Conclusions:

The ZB2 program accurately simulates certain aspects of coagulation, particularly relating to initial particle velocity.
Discrepancies between simulated and real-world results for coagulant excess highlight the need for further refinement of simulation models.
The ZB2 program serves as a foundation for developing specialized, localized simulation tools for wastewater treatment plants.