Polyaluminum chloride can remove colloidal substances in water due to some physical and chemical effects in the coagulation process. This is because:
Adsorption: Polyaluminum chloride is a macromolecular material, which plays an adsorption bridging role in water, so that the particles in water stick to each other to form large particles, and then the colloidal material is removed by precipitation.
Neutralization: polyaluminum chloride generates a large number of highly charged positive ions in water, while colloidal substances in natural water are mostly negatively charged, which makes them attract each other with different charges and neutralize each other, thus eliminating the electrostatic repulsion between colloidal particles and growing into large particles, which can be removed by gravity sedimentation.
The surface contact effect and flocculation process are carried out on the surface with particles as the core, so as to make the particle surfaces contact, bond to form large particles, and remove them through sedimentation.
Filtration, the process of flocculation settling in water, is like a falling filter screen, thus wrapping up other particles to settle together.
The colloidal substances in water are removed through these complex processes.
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