What is polyaluminium chloride flocculant?

Poly Aluminium Chloride (PAC) is an inorganic polymer flocculant, which is widely used in the water treatment industry due to its high efficiency and rapid flocculation performance. PAC has excellent decolorization ability and strong turbidity removal effect, so it is used in the treatment of drinking water, industrial wastewater and urban sewage.

Working Principle of Polyaluminium Chloride

Polyaluminium chloride effectively removes suspended matter, colloidal impurities and organic matter in water through coagulation and precipitation. First, PAC hydrolyzes in water to form a large number of highly charged cations, which can neutralize the negatively charged colloidal particles in the water, causing them to lose stability. The flocs formed then further capture suspended matter in the water and form large flocs (commonly known as alum flowers) through their own adsorption bridging effect, which eventually settle or float to the water surface.

Advantages of polyaluminium chloride

Compared with traditional aluminum salts and iron salts, polyaluminum chloride has many advantages in flocculation effect, dosage and sludge generation. First, PAC has better flocculation effect, the generated alum flocs are denser and the sedimentation rate is faster. Secondly, the optimal dosage of PAC is lower, which greatly reduces the dosage of the agent and the cost of sludge treatment. At the same time, PAC also has good acid and alkali resistance and is suitable for a wide range of water quality.

Application Areas

Polyaluminium chloride is widely used in the water treatment industry. It can not only effectively treat urban sewage, but also be widely used in drinking water treatment, industrial circulating cooling water treatment, papermaking wastewater treatment and other fields. In drinking water treatment, PAC can effectively remove turbidity, bacteria and some heavy metals in water, improving water quality safety. In industrial wastewater treatment, PAC can solve the problem of high-concentration organic pollutants and ensure that wastewater meets discharge standards.

Conclusion

As an efficient, low-cost and stable flocculant, polyaluminium chloride has become indispensable in modern water treatment processes. Through reasonable addition and scientific operation, polyaluminium chloride can significantly improve water quality, protect the environment, and provide security for social water safety.