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J Korean Soc Environ Eng > Volume 37(6); 2015 > Article
J Korean Soc Environ Eng 2015;37(6): 325-331. doi: https://doi.org/10.4491/KSEE.2015.37.6.325
정수처리 응집효율 개선을 위한 Al(III)염과 Fe(III)염 응집제의 비교
한승우2, 강임석1
1(주)이에프티 기업부설연구소
2부경대학교 환경공학과
Comparison of Al(III) and Fe(III) Coagulants for Improving Coagulation Effectiveness in Water Treatment
Seung woo Han2, Lim seok Kang1
1EFT R&D Center
2Department of Environmental Engineering, Pukyong National University
Corresponding author  Lim seok Kang ,Tel: 051-629-6527, Fax: 051-629-6523, Email: kangls@pknu.ac.kr
Received: April 22, 2015;  Revised: June 9, 2015;  Accepted: June 18, 2015.  Published online: June 30, 2015.
ABSTRACT
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 FeCl3 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 FeCl3 > PACl (r=2.2) > PACl (r=1.2) > alum. FeCl3 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 FeCl3 were considered as more appropriate coagulants for the removal of turbidity in the case of raw water exhibiting higher pH.
Key Words: Coagulant, Basicity, Aluminum Salt, Ferric Salt, Coagulation Effectiveness
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