Does polyaluminum chloride hydrolysis affect kaolin coagulation performance?

The effects of polyaluminum chloride (PACl) hydrolysis prior to coagulation on both the coagulation zone and coagulation performance of a kaolin suspension were investigated by a novel jar test named the “reversed coagulation test”.

What is a hydrolyzed coagulant?

Hydrolyzing coagulants are extensively used in water and wastewater treatment, often under conditions where hydroxide precipitation is important, giving "sweep flocculation". Pre-hydrolyzed coagulants, such as polyaluminium chloride (PACl) are also widely used and have several advantages over traditional additives, such as aluminium sulfate.

Does PACL hydrolysis increase turbidity during charge neutralization coagulation?

Conclusions PACl hydrolysis prior to coagulation caused an increase in the optimal dosage for charge neutralization coagulation and sweep coagulation, and also induced an increase in the residual turbidity of a kaolin suspension during charge neutralization coagulation.

Does polymeric aluminum chloride coagulate efficiently?

Taking the more widely used polymeric aluminum chloride (PACl) as an example, coagulation efficiency is closely related to the characteristics and distribution of Al species of PACl (He et al. 2024).

Can fine bubbles enhance coagulation efficiency by forced hydrolysis of PACL?

Although the physicochemical characteristics of the fine bubbles needed to be further investigated, the results of the coagulation enhancement showed the feasibility of the fine bubbles to enhance the coagulation efficiency by forced hydrolysis of PACl.

Does ALCL 3 polyaluminum chloride coagulate humic acid?

Therefore, the coagulation performance and mechanism of AlCl 3, polyaluminum chloride with basicity of 2.2 (PAC 22 ), and PAC 25 in treating polyethylene (PE), humic acid (HA), and PE-HA composite systems were systematically investigated.