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”.

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.

How does poly aluminum chloride affect sludge production?

PAC benefited the aggregates of sludge flocs. PAC caused more EPS remained in sludge cells. Solubilization, hydrolysis, acidiogenesis, and methanogenesis were inhibited by PAC. Alb and Alc were the contributors to the decreased SCFA production. Poly aluminum chloride (PAC) is accumulated in waste activated sludge at high levels.

What is a polyaluminium chloride (PACL)?

The IPFs, such as polyaluminium chloride (PACl) and polyiron chloride (PICl), are a category of partially neutralized metal salts with significant polymeric fraction present in some circumstances.

How does poly aluminum chloride affect short-chain fatty acids (SCFA) production?

Alb and Alc were the contributors to the decreased SCFA production. Poly aluminum chloride (PAC) is accumulated in waste activated sludge at high levels. However, details of how PAC affects short-chain fatty acids (SCFA) production from anaerobic sludge fermentation has not been documented.

Does pH affect the hydrolysis of PACL?

Based on the work done by Wang et al. (2004), solution pH has a significant effect on the hydrolysis of PACl, especially for PACl with a low basicity ( [OH]/ [Al]). It was found that a large amount of Al b can form for PACl within weak acidic condition, but it transforms quickly into Al c after aging.