| Title |
Comparison of PACl with Al ( 3 ) Coagulants in Water Treatment and Its Characterization |
| Authors |
한승우(Seung Woo Han),강임석(Lim Seok Kang) |
| Abstract |
Various Al(Ⅲ) solutions having different r (OH_(added)/Al) values and chemical species compositions were prepared and physical arid chemical characteristics of PACls solutions were examined. Then, the prepared PACls were compared with other Al(Ⅲ) coagulants for coagulation characteristics in water treatment process. The addition of NaOH to the supersaturated AlCl₃ solutions made it possible to synthesize the different types of PACls useful for water treatment. The result of the analysis by timed spectrophotometer with a color developing reagent (ferron) showed that r (OH_(added)/Al), initial aluminum concentration, and base concentration significantly influenced the hydrolytic compositions of aluminum in PACls, but revealed that Al species distribution of PACls was little affected by the base injection rate ranging from 21.5 ㎖/hr to 60 ㎖/hr. Coagulation test of synthetic water showed that the effect of coagulation pH on turbidity removal was severer for low r ratio PACls, alum, and AlCl₃. Also, the effect of pH for coagulation of Nakdong river water showed that each Al(Ⅲ) coagulant had different effects on turbidity and TOC removal. Especially, PACls were least affected among other Al(Ⅲ) coagulants used. |