High-poly-aluminum chloride sulfate coagulants and their coagulation performances for removal of humic acid
Related Experiment Video
Updated: Sep 25, 2025

Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments
Published on: May 11, 2017
Zhen Wu1,2, Xian Zhang1,2, Jinglin Pang1
1Department of Chemical Engineering, Ordos Institute of Technology Ordos 017000 China hnuzx1101@163.com panyue_zhang@bjfu.edu.cn +86 18647722156.
Abstract:
High-poly-aluminum chloride sulfate (HPACS) coagulants with different [SO4 2-]/[Al3+] molar ratio (S) were prepared and proved to have high coagulation efficiency for the removal of humic acid and strong stability for storage and application. The results showed that the higher the SO4 2- addition, the bigger the aluminum polymerization particles and the more the polymerization Alc existed in the prepared HPACS coagulants. The HPACS exhibited higher coagulation efficiency, a better aging stability and stronger resistance to the change of pH and Ca2+ concentration of raw water than the polyaluminum chloride (PAC) and poly-aluminum chloride sulfate (PACS) reported before. The Sips adsorption neutralization model was established to illustrate the relationship between coagulant dosage and zeta potential of the water system. The adsorption neutralization capacity was proved to be HPACS (S = 0) > HPACS (S = 0.02) > HPACS (S = 0.06) > HPACS (S = 0.10), which was not completely consistent with the coagulation effect of HPACS with different S values and indicated that in addition to adsorption neutralization, actions like bridge-aggregation, precipitation, and sweep-flocculation also played an important role during HPACS coagulation. Moreover, the negative Gibbs free energy indicated that the coagulant adsorption neutralization reaction was a spontaneous process.
More Related Videos
Related Concept Videos
Coagulation
Precipitation and Co-precipitation
Extraction: Advanced Methods
Colloidal precipitates
Precipitation of Ions
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
Factors Affecting Solubility

