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Comparison of Al(III) and Fe(III) Coagulants for Improving Coagulation Effectiveness in Water Treatment
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 Title & Authors
Comparison of Al(III) and Fe(III) Coagulants for Improving Coagulation Effectiveness in Water Treatment
Han, Seung woo; Kang, Lim seok;
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The experimental results of the characteristics of aluminum based and ferric based coagulants for the Nakdong River water showed that the main hydrolysis species contained in alum and are monomeric species of 98% and 93.3%, respectively. The PACl of r=1.2 produced by the addition of base contained 31.2% of polymeric Al species and the PACl of r=2.2 contained 85.0% of polymeric Al species, as showing more polymeric Al species with increasing r value. Coagulation tests using Al(III) and Fe(III) salts coagulants for the Nakdong River water showed that the coagulation effectiveness of turbidity and organic matter was high in the order of > PACl (r=2.2) > PACl (r=1.2) > alum. has showed better flocculation efficiency than Al(III) salts coagulants. In addition, in case of Al(III) coagulants, the Al(III) coagulants of higher basicity, which contained more polymeric Al species, resulted in better coagulation efficiency for both turbidity and organic matter removed. The optimum pH range for all of the coagulants investigated was around pH 7.0 under the experimental pH range of 4.0~9.5. Especially, the highest basicity PACl (r=2.2) and were considered as more appropriate coagulants for the removal of turbidity in the case of raw water exhibiting higher pH.
Coagulant;Basicity;Aluminum Salt;Ferric Salt;Coagulation Effectiveness;
 Cited by
수처리용 Fe(III)계 응집제의 특성 및 응집특성 비교,한승우;강임석;

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