In today’s world, with the growing concern for environmental protection and water resource conservation, the treatment of domestic sewage has become a crucial task. Poly aluminium chloride (PAC), a widely used water treatment chemical, has been playing a significant role in this field.
Outstanding Flocculation Performance
When PAC is added to domestic sewage, it undergoes hydrolysis to produce a series of positively charged hydrolysis products. These products can strongly adsorb the negatively charged colloidal particles in the sewage, such as those formed by the interaction of surfactants with oil stains and dust particles. Through the mechanisms of electrostatic neutralization and adsorption bridging, PAC promotes the aggregation of colloidal particles into larger flocs, which can then settle or be filtered out easily, thereby achieving effective solid-liquid separation and removing suspended solids and impurities from the water.
Wide pH Adaptability and Good Low-temperature Performance
PAC has a relatively wide pH application range of 5.0–9.0, ensuring stable performance in domestic sewage treatment under different pH conditions. Unlike traditional coagulants, PAC can achieve good coagulation and turbidity removal effects in both low-temperature (<5℃) and normal-temperature water, which is of great significance for domestic sewage treatment in cold regions or during winter.
Excellent Decolorization and Phosphorus Removal Effect
Domestic sewage often contains a certain amount of colored substances and phosphorus nutrients. PAC can effectively remove color from the sewage by adsorbing and aggregating colored particles. Moreover, it can combine with phosphorus in the water to form insoluble phosphates, which are then removed along with the flocs, thereby reducing the phosphorus content in the sewage and preventing water eutrophication caused by excessive phosphorus discharge.
Cost-effective and Environmentally Friendly
PAC can replace traditional flocculants and coagulants, significantly improving the purification efficiency of sewage treatment while reducing treatment costs. It can reduce the dosage of coagulants by 2/3 compared to traditional aluminum salts and achieve the same treatment results at lower doses. Additionally, PAC has low residual aluminum content in treated water, avoiding secondary pollution problems that may be caused by traditional aluminum salts, making it more environmentally friendly.
Practical Application Effects
Numerous practical applications have proven that PAC is highly effective in domestic sewage treatment. For instance, in a domestic sewage treatment plant in [specific location], after using PAC as the main flocculant, the turbidity removal rate of the treated water reached over 90%, the chemical oxygen demand (COD) removal rate exceeded 80%, and the phosphorus removal rate was also remarkable, with the treated water quality meeting or even exceeding discharge standards. This has effectively improved the surrounding water environment and reduced the impact of domestic sewage on rivers, lakes, and other water bodies.
In conclusion, poly aluminium chloride demonstrates remarkable performance in domestic sewage treatment. With its outstanding flocculation, decolorization, phosphorus removal, and other functions, it provides a powerful solution for addressing domestic sewage pollution. As environmental awareness continues to rise, PAC is expected to play an even more important role in the field of domestic sewage treatment, contributing to the protection of water resources and the construction of a beautiful environment.
