Coagulation properties of an electrochemically prepared polyaluminum chloride containing active chlorine

With high content of the Al13 species and the active chloride, an electrochemically prepared polyaluminum chloride (E-PACl) presents integrated efficiency of coagulation and oxidation. The coagula- tion properties of E-PACl were systemically investi- gated through jar tests in the various water quality conditions. The active chlorine in E-PACl can signifi- cantly influence the coagulation behavior due to the active chlorine preoxidation, which can change the surface charge characteristic of organic matter (OM) in water. The active chlorine preoxidation could im- prove the E-PACl coagulation efficiency if the water possessed the characteristics of relatively low OM content (2 mg/L) and high hardness (278 mg CaCO3/L). In the water with medium content of OM (5 mg/L), dosage would be a crucial factor to decide whether the active chlorine in E-PACl aided coagula- tion process or not. Comparing with alkaline condition, active chlorine would show a more significant influ- ence on the coagulation process in acidic region.

With high content of the Al13 species and the active chloride, an electrochemically prepared polyaluminum chloride （E-PACI） presents integrated efficiency of coagulation and oxidation. The coagulation properties of E-PACI were systemically investigated through jar tests in the various water quality conditions. The active chlorine in E-PACI can significantly influence the coagulation behavior due to the active chlorine preoxidation, which can change the surface charge characteristic of organic matter （OM） in water. The active chlorine preoxidation could improve the E-PACI coagulation efficiency if the water possessed the characteristics of relatively low OM content （2 mg/L） and high hardness （278 mg CaCO3/L）. In the water with medium content of OM （5 mg/L）, dosage would be a crucial factor to decide whether the active chlorine in E-PACI aided coagulation process or not. Comparing with alkaline condition active chlorine would show a more significant influence on the coagulation process in acidic region.