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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...

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Related Experiment Video

Updated: Jul 19, 2025

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

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High-throughput screening to evaluate optimum coagulation conditions via colloidal stability analysis.

Abhishek Premachandra¹, Yves McKay¹, Matthew McClure¹

¹Department of Chemical Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario, L8S 4L7, Canada.

|August 12, 2023

Summary

Analytical centrifuges rapidly screen coagulant dosage for wastewater treatment. This method optimizes chemical use and sludge production, outperforming traditional jar testers.

Keywords:

Analytical centrifuge Coagulant screening Colloid stability Floc settling kinetics Industrial wastewater

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Area of Science:

Environmental Engineering
Analytical Chemistry
Water Treatment Technologies

Background:

Traditional coagulant dosage optimization relies on labor-intensive jar testers.
Jar testers are insufficient for dynamic wastewater treatment processes with variable influent properties.
Analytical centrifuges (ACs) offer a potential solution with their integrated optics and low sample volume requirements.

Purpose of the Study:

To evaluate the suitability of analytical centrifuges (ACs) for optimizing coagulant dosage in wastewater treatment.
To investigate the stability and settling kinetics of coagulation processes using ACs.
To establish ACs as a rapid screening tool for wastewater treatment performance.

Main Methods:

Wastewater centrate samples from a biogas facility were analyzed using ACs.
A comprehensive screening was performed using varying pH and ferric chloride concentrations.
Front-tracking profiles from the AC's integrated optics system were used to monitor phase boundary movement.

Main Results:

AC front-tracking profiles identified minimal coagulation conditions for rapid settling.
Settling velocity correlated with an instability index, predicting optimal separation.
Chemical Oxygen Demand (COD) removal plateaued around an instability index of 0.5.
ACs accurately estimated sludge volume under different coagulation conditions.

Conclusions:

Analytical centrifuges are effective for rapid evaluation of wastewater treatment performance.
ACs significantly reduce material consumption and operator time compared to jar testers.
This study validates ACs as a valuable tool for optimizing coagulant dosage and predicting treatment outcomes.