최적 응집 효율을 위한 A1계 액상 응집제의 희석 효과

허재용; 이상화; Jac-Yong Heo; Sang-Wha Lee

Journal of the Korean Industrial and Engineering Chemistry, Vol.17, No.1, 37-43, February, 2006

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최적 응집 효율을 위한 A1계 액상 응집제의 희석 효과

The Predilution Effect of Al-based Liquid Coagulants for the Optimal Efficacy

허재용, 이상화 ^†

경원대학교 화학생명공학과

Jac-Yong Heo, and Sang-Wha Lee^†

Department of Chemical and Bio Engineering, Kyungwon University, Kyunggi-Do 461-701, Korea

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The coagulation efficacy of Al-based coagulants (such as Alum, PACS, and PACC) was investigated to ascertain removal efficiencies of turbidity and phosphate with variation of solution pH, coagulant dosages, and pre-dilution ratios. The efficacy of Al-based coagulants was maximized in the pH range of 6~9. Under the initial condition of pH 8, 10 mg/L PO4 3-, and 20 NTU, Al-based coagulants exhibited a similar efficacy in the removal of turbidity, whereas the removal efficiency of phosphate was clearly dependent on the basicity of coagulants: Alum (0%) > PACS (45~50%) > PACC (70%). At high initial turbidity of 100 NTU, polymeric coagulants, such as PACS and PACC, exhibited a higher removal efficiency of turbidity compared to Alum. In comparison to direct injection of coagulants at low initial turbidity (20 NTU), 500~2000 times pre-diluted ALum, exhibited reduced coagulation efficacy; however, removal efficiencies of turbidity and phosphate increased with the increase of retention time. Pres-diluted PACC exhibited the enhanced coagulation efficacy followed by silght decrease of the removal efficiencies with increase of the retention time. At high initial turbidity of 100 NTU, pre-diluted Alum and PACC exhibited higher removal efficiencies of turbidity and phosphate.

Keywords:Al-based;coagulants;predilution;phosphate;turbidity

[References]

Kwak JW, Physico-Chemical Principle and Practice of Water Treatment, Ji-Sam, Seoul (1998)
Kang KY, Jung HS, Cheon JK, J. Korean Ind. Eng. Chem., 15(5), 523 (2004)
Kim JS, Choi JH, J. Korean Ind. Eng. Chem., 9(3), 330 (1998)
Amirtharajah A, Mills KJ, J. AWWA., 74, 210 (1982)
Rossini M, Garrido JG, Galluzzo M, Water Res., 33, 1817 (1999)
Francois RJ, Water Res., 21, 523 (1987)
Lee SW, Lee KS, Kang IJ, Yoon HH, Haam SJ, Kwak JW, J. Korean Ind. Eng. Chem., 16(1), 74 (2005)
Lee SW, Lee KS, Kwak JW, J. KSWO., 18, 19 (2002)
Kwak JW, Environ. Technol., 18, 293 (1997)
Kim SH, J. KSEE., 18, 603 (1996)
Kemira K, Handbook on Water Treatment, Helsingborg, Sweden (1993)
Gillberg L, Influence of the Basicity of Polyaluminium Chlorides When Cleaning Municipal Wastewater, Chemical Water and Wastewater treatment III, 39 (1994)
Letterman RD, Quon JE, Gemmell RS, J. AWWA, 65, 716 (1973)
Randtke SJ, J. AWWA, 80, 40 (1988)

[Related Articles]

[1] Kwak JW, Physico-Chemical Principle and Practice of Water Treatment, Ji-Sam, Seoul (1998)

[2] Kang KY, Jung HS, Cheon JK, J. Korean Ind. Eng. Chem., 15(5), 523 (2004)

[3] Kim JS, Choi JH, J. Korean Ind. Eng. Chem., 9(3), 330 (1998)

[4] Amirtharajah A, Mills KJ, J. AWWA., 74, 210 (1982)

[5] Rossini M, Garrido JG, Galluzzo M, Water Res., 33, 1817 (1999)

[6] Francois RJ, Water Res., 21, 523 (1987)

[7] Lee SW, Lee KS, Kang IJ, Yoon HH, Haam SJ, Kwak JW, J. Korean Ind. Eng. Chem., 16(1), 74 (2005)

[8] Lee SW, Lee KS, Kwak JW, J. KSWO., 18, 19 (2002)

[9] Kwak JW, Environ. Technol., 18, 293 (1997)

[10] Kim SH, J. KSEE., 18, 603 (1996)

[11] Kemira K, Handbook on Water Treatment, Helsingborg, Sweden (1993)

[12] Gillberg L, Influence of the Basicity of Polyaluminium Chlorides When Cleaning Municipal Wastewater, Chemical Water and Wastewater treatment III, 39 (1994)

[13] Letterman RD, Quon JE, Gemmell RS, J. AWWA, 65, 716 (1973)

[14] Randtke SJ, J. AWWA, 80, 40 (1988)