What is the role of polyaluminum chloride in sewage treatment?

At the same time, polyaluminum chloride can also play a role in assisting coagulation, helping polyacrylamide to accelerate the sedimentation, making the water clear and sludge sinking. This is why need to add PAC first and then PAM in sewage treatment process.

What are the uses of polyaluminum chloride and polyacrylamide?

In the sewage treatment of papermaking, steel, metallurgy, mineral processing, chemical, electroplating, slaughter, urban sewage and other industries, it is often necessary to add polyaluminum chloride and polyacrylamide to accelerate the sedimentation rate of pollutants in the water in the process of flocculation and precipitation.

Why is polyaluminum chloride acidic?

Why? We need to know the functions of PAC and PAM first. The aqueous solution of polyaluminum chloride is acidic, with a pH between 3.5-5.0, which can adjust the pH of the water quality. The applicable water pH range of polyaluminum chloride is between 3-12, which is wider than that of polyacrylamide.

What is the effect of polyacrylamide on water quality?

PAChas a certain demulsification ability. When PACis used alone, floccules will form in the water, but these flocs are not easy to settle, the water quality is turbid after treatment, and the effect of rapid flocculation and sedimentation cannot be achieved. When using polyacrylamide, the pH range of water quality is between 6-9.