Is polyaluminium chloride a safe coagulant?

Polyaluminium Chloride is a safer alternative to several other chemical coagulants. For instance, aluminium sulphate has been widely used as coagulant for many years. It removes contaminates and general turbidity from water during the water treatment process.

Can polyaluminum chloride be used in water treatment?

In this study, synthesis and speciation of polyaluminum chloride (PAC) for application in water treatment was investigated using a colorimetric speciation method. It was possible to produce stable preparations of PAC solutions in which a relatively stable cationic polymer predominated.

Is polyaluminium chloride better than polyelectrolyte – alum-based coagulation?

At the Barekese Water Treatment Plant in Ghana, an alternative, the polyelectrolyte – polyaluminium chloride (PAC) is also used in coagulation but limited information is available on the operating conditions required to achieve better performance than alum-based coagulation.

Can PAC coagulants contain aluminum precipitates?

A variety of species can be formed when stock solutions of PAC are added to a raw water. O'Melia and Dempsey (1982), in a review of work done using a wide variety of PAC coagulants, proposed that some PAC formulations may contain aluminum precipitates.

What is polyaluminum chloride (PAC)?

Polyaluminum chloride (PAC), a pre-hydrolyzed Al-based polymer coagulant, has been found to be less sensitive to temperature and thus more suitable for application at lower temperatures .

Can high-basicity polyaluminum chloride and high-viscosity chitosan be used for?

High-basicity PAC/chitosan led to an effective coagulation and residual Al control. Molecular size of chitosan has an important role in the coagulation performance. This study evaluated the feasibility of integrating high-basicity polyaluminum chloride (PAC) and high-viscosity chitosan for the coagulation of low-temperature and low-turbidity water.