How PACL coagulation zones are compared with alum?

The coagulation zones at various PACl dosages and solution pH values were developed and compared with those of alum. It is found that the optimal mechanism under acidic condition is charge neutralization, while alkaline condition will facilitate the coagulation of PACl.

Does polyaluminum chloride coagulate with hydrolyzed coagulants?

Coagulation with hydrolyzing coagulants has been studied thoroughly, but the coagulation behavior of pre-hydrolyzed coagulants such as polyaluminum chloride (PACl), especially the coagulation mechanisms at various coagulant dosages and pH values of raw water, has not been systemically investigated and not been well understood , .

Do PACL precipitates control charge neutralization coagulation process?

The destabilization extent of primary particles and PACl precipitates seems to control charge neutralization coagulation process. Sufficient PACl precipitates could reduce the adverse effect of insufficient destabilization in charge neutralization coagulation process to some extent.

Is PACL a pre-hydrolyzed coagulant?

As a pre-hydrolyzed coagulant, PACl is becoming increasingly popular in the coagulation–flocculation process.

What is the basicity of PACL powder?

Commercial PACl powder (Nanning Chemical Engineering Co. Ltd., Nanning, China), with a basicity (OH/Al) of 1.35 and Al 2 O 3 content of 30% (mass fraction), was dispersed into deionized water to prepare a concentrated stock solution (2 mol·L − 1 Al).

Does pH affect the coagulation mechanism of kaolin suspension?

4. Conclusions In the conventional jar tests for the coagulation of kaolin suspension with PACl as coagulant, the pH value of the treated suspension and PACl dosages have significant effects on the coagulant mechanism of PACl.