Preparation and characterization of organic polymer modified composite polyaluminum chloride

Compared with traditional aluminum salts, polyaluminum chloride （PACI） has better coagulation-flocculation performance in turbidity removal. However, it is still inferior to organic polymers in terms of bridging function. In order to improve the aggregating property of PACl, different composite PACl flocculants were prepared with various organic polymers. The effect of organic polymer on the distribution or Al（Ⅲ） species in composite flocculants was studied using ^27TAl NMR and Al-ferron complexation methods. The charge neutralization and surface adsorption characteristics of composite flocculants were also investigated. Jar tests were conducted to evaluate the turbidity removal efficacy of organic polymer modified composite flocculants. The study shows that cationic polymer and anionic polymer have significant influences on the coagulation-flocculation behaviors of PACl. Both cationic and anionic polymers can improve the turbidity removal performancc of PACl but the mechanisms arc much different： cationic organic polymer mainly increases the charge neutralization ability, but anionic polymer mainly enhances the bridging function.

Preparation and characterization of organic polymer modified composite polyaluminum chloride

Compared with traditional aluminum salts, polyaluminum chloride(PACl) has better coagulation-flocculation performance in turbidity removal. However, i t is still inferior to organic polymers in terms of bridging function. In order to improve the aggregating property of PACl, different composite PACl flocculant s were prepared with various organic polymers. The effect of organic polymer on the distribution of Al(III) species in composite flocculants was studied using 2 7Al NMR and Al-ferron complexation methods. The charge neutralization and surfac e adsorption characteristics of composite flocculants were also investigated. Ja r tests were conducted to evaluate the turbidity removal efficacy of organic pol ymer modified composite flocculants. The study shows that cationic polymer and a nionic polymer have significant influences on the coagulation-flocculation behav iors of PACl. Both cationic and anionic polymers can improve the turbidity remov al performance of PACl but the mechanisms are much different: cationic organic p olymer mainly increases the charge neutralization ability, but anionic polymer m ainly enhances the bridging function.