What is polyaluminum chloride coagulant?

1. Introduction Polyaluminum chloride (PAC) coagulant has been developed and used in water and wastewater treatment since the 1980s throughout the world (Jiang, 2001). PAC is made by partial hydrolysis of acid aluminum chloride solution using a specific reactor.

What is poly-Aluminium chloride (PAC)?

Poly-Aluminium Chloride (PAC)is a kind of highly effective water purificiant, which is wildly used in the purification of table water, industry water, industry circulation water and wasted and polluted water from pharmacy industry, paper making industry and printing and dying industry, as well as life wasted water.

Why is PAC a superior coagulant than alum?

Here comes the role of basicity of a coagulant and explains why PAC is a superior coagulant than alum. Basicity is a quantitative measure of how many hydroxyl ions are included in the structure of a polyaluminium coagulant. The higher the basicity of a coagulant, the lower the impact it will have on dosed water pH.

What is polyaluminium chloride used for?

Polyaluminium chloride (aluminium chlorohydrate) also simply called PAC, is used in deodorants and as a coagulant in water purification. This compound is preferred in some cases because of its high charge, which makes it more effective at destabilizing and removing suspended materials than other aluminium salts. CAS No.: 1327-41-9

What is the basicity of a polyaluminium coagulant?

Basicity is a quantitative measure of how many hydroxyl ions are included in the structure of a polyaluminium coagulant. The higher the basicity of a coagulant, the lower the impact it will have on dosed water pH. For example, a polyaluminium structure like (Al2 (OH)5Cl) has basicity of 83.3%.

Can PAC be applied to water with broad pH range?

It can be applied to water with broad pH range. The floc function valid in water of pH 5 to pH 9 Comparing to inorganic flocculants, PAC is suitable for water of broad temperature, and is functional in low temperature water. It reduces less basicity less, so less or no basifier needed.