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Received March 15, 2007
Accepted January 17, 2008
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Improvement in the coagulation performance by combining Al and Fe coagulants in water purification
Marin Pollution Control Division, Gunsan Coast Guard, 9-9 Soryongdong, Gunsan Si, Jeollabukdo 573-400, Korea 1Department of Environmental Engineering, Cheongju University, 36, Naedok-dong, Sangdang-gu, Cheongju, Chungbuk 360-764, Korea 2Department of Environmental Engineering, Konkuk University, 1, Hwayang-dong, Gwangjin-gu, Seoul 143-701, Korea
Korean Journal of Chemical Engineering, May 2008, 25(3), 505-512(8), 10.1007/s11814-008-0085-3
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Abstract
This study evaluated the beneficial effects on the coagulation process of combining coagulants with Fe and Al in the removal of turbidity and DOC (dissolved organic carbon), and proposed conditions for proper operation of a coagulation process. In addition, the floc characteristics and sludge dewater ability were evaluated. Blended coagulants were more effective than single coagulants at lower concentrations in water purification. The optimal blended ratio for the removal of DOC was 1.45 mM as Al/mM as Fe. Also, blended coagulants were less affected than single coagulants by pH, temperature, and rapid mixing intensity. Based on the results of the change in the apparent molecular weight distribution (AMWD) of DOC in raw and treated water by coagulation, low molecular weight organic matters were removed by 40.7% for the blended coagulant (1.45 mM as Al/mM as Fe). Blended coagulants formed larger flocs than single coagulants did. At pH 6.0, floc strength and sludge dewaterablity were both improved.
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Myung BT, Woo DS, Choi JH, Lee YJ, Nam SH, Kor. J. Env. Hlth. Soc., 27, 60 (2001)
Dharmappa HB, Verink J, Fujiwara O, Vigneswaran S, Water Res., 27(3), 513 (1993)
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Biggs CA, Lants PA, Water Res., 34, 2542 (2000)
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Johnson PN, Amirtharajah A, J. AWWA, 75, 232 (1983)
Edzwald JK, Water Sci. Technol., 27, 11 (1993)
Vesilind PA, J. WPCF, 60, 215 (1988)
APHA, AWWA and WEF, Standard methods for the examination of water and wastewater (19th edition), Washinton, D.C. (1995)
Amy GL, Sierka RA, Bedessem J, Price D, Tan L, J. AWWA, 84, 67 (1992)
Benschoten JEV, Edzwald JK, Water Res., 24, 1519 (1990)
