Poly Aluminium Chloride (PAC) is a highly effective inorganic coagulant widely used in water treatment processes. It is a complex aluminium-based polymer formed by the reaction of aluminium hydroxide or aluminium chloride with a base, usually involving a series of hydrolysis and polymerization reactions. 

PAC comes in liquid or powder form and possesses a varying degree of positive charge, which is instrumental in its functionality. When introduced into water, PAC molecules interact with negatively charged particles such as suspended solids, colloids, and microorganisms, neutralizing their charges and promoting the agglomeration of these particles into larger masses called flocs.

This coagulation-flocculation process significantly improves the sedimentation and filtration properties of the water. PAC is highly effective in removing turbidity, color, organic matter, and even certain heavy metals from water, hence its extensive use in municipal drinking water treatment, industrial wastewater treatment, and various other water purification applications.

Different PAC products can have different properties depending on their manufacturing processes, which can result in variations in their Al species distribution and charge density. This variability allows for customization to meet specific water treatment needs, such as varying pH conditions, water hardness, and target contaminants.

Overall, PAC is valued for its versatility, high efficiency, and relatively low cost compared to other coagulants, making it a popular choice in the water treatment industry.

What is Poly Aluminium Chloride (PAC)?

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