At NINGBO INNO PHARMCHEM CO.,LTD., we are passionate about the science behind water treatment. Polyaluminium Chloride (PAC) is a remarkable chemical agent, and understanding its mechanism of action – specifically, how it facilitates flocculation – is key to appreciating its effectiveness. This article explores the scientific principles that make PAC a leading solution for water purification.

Water, especially in its natural state or as wastewater, contains various impurities. These can be dissolved substances, colloidal particles, or larger suspended solids. Colloidal particles, typically ranging from 1 nanometer to 1 micrometer, are particularly challenging to remove because they are too small to settle naturally and often carry a surface charge that keeps them dispersed. This is where coagulants like PAC come into play.

The primary function of Polyaluminium Chloride is to act as a coagulant. It is an inorganic polymer composed of aluminum, oxygen, and chlorine. When added to water, PAC undergoes hydrolysis, forming positively charged polymeric species, such as Al13 polymers. These positively charged species are highly effective at neutralizing the negatively charged colloidal particles in the water. This neutralization process is known as 'charge neutralization' or 'cationic bridging'.

Once the charges are neutralized, the destabilized particles begin to attract each other, forming micro-flocs. This process is often facilitated by the bridging action of the longer PAC polymer chains, which physically link multiple particles together. The resulting micro-flocs are still relatively small but are no longer electrostatically repelled from each other.

Following coagulation, the process of flocculation begins. This is a slower process where the micro-flocs are gently agitated, allowing them to collide and aggregate into larger, visible flocs. The efficiency of flocculation depends on factors like mixing intensity, contact time, and the characteristics of the coagulant used. PAC is known for forming dense and fast-settling flocs, which is a significant advantage in sedimentation tanks and filters.

For those looking to buy Polyaluminium Chloride, understanding this scientific basis emphasizes why it is so effective in applications like industrial wastewater treatment. NINGBO INNO PHARMCHEM CO.,LTD. provides high-purity PAC that ensures optimal hydrolysis and efficient charge neutralization, leading to superior flocculation. Our commitment is to supply chemicals that perform reliably and scientifically.

In essence, PAC's effectiveness stems from its complex polymeric structure and its ability to interact with and aggregate impurities through charge neutralization and bridging. This scientific understanding confirms why Polyaluminium Chloride is a cornerstone of modern water treatment technologies, enabling the production of clean and safe water.