Flotation efficiency of activated sludge flocs using population balance modelin dissolved air flotation

Heung-Joe Jung; Jae-Wook Lee; Do-Young Choi; Seong-Jin Kim; Dong-Heui Kwak

Korean Journal of Chemical Engineering, Vol.23, No.2, 271-278, March, 2006

DOI10.1007/BF02705726 Export Citation

Flotation efficiency of activated sludge flocs using population balance modelin dissolved air flotation

Heung-Joe Jung, Jae-Wook Lee , Do-Young Choi , Seong-Jin Kim¹, and Dong-Heui Kwak^†

Department of Environment and Chemical Engineering, Seonam University, Gwangchi Dong, Namwon, Jeonbuk 590-711, Korea
¹Department of Sanitary and Environmental, Hanyeong College, Yeosu, Jeonnam 550-260, Korea

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The activated sludge process is one of the most frequently used processes for biological wastewater treat-ment. Conventional gravity sedimentation (CGS), which is widely used as a secondary clarifier in activated sludgeprocesses, has a routine problem due to floating tendency, called bulking, caused by filamentous microorganisms. Dis-solved air flotation (DAF) has been applied as potential alternative to CGS as a secondary clarifier. A series of ex-periments were performed to measure physico-chemical characteristics and removal efficiency of activated sludge flocs.The removal efficiency of flocs corresponding in lag and exponential growth phases was lower, while that of flocs bothin stationary and endogenous phases considerably increased. The rise velocity of floc/bubble agglomerates was cal-culated by using a population balance (PB) model explaining the distribution of floc/bubble agglomerates. The ex-perimental results of flotation efficiency showed a similar tendency with the results predicted by PB model for the risevelocity and distribution of floc/bubble agglomerates. It was found from our study that the DAF process was very effec-tive as a secondary clarifier in the activated sludge process.

Keywords:DAF;Dissolved Air Flotation;Population Balance Model;Activated Sludge;Flotation Efficiency

[References]

American Public Health Association, American Water Works Association and Water Pollution Control Federation (APHA-AWWAWPCF), Standard methods for the examination of water and wastewater, 20th ed., Washington, DC (1998)
Bourgeois JC, Walsh ME, Gagnon GA, Water Res., 38, 1173 (2004)
Clift R, Grace JR, Weber ME, Bubbles, drops, and particles, Academic Press, New York (1978)
Edzwald JK, Water Sci. Technol., 31(3-4), 1 (1995)
Fukushi K, Tambo N, Matsui Y, Water Sci. Technol., 31(3-4), 37 (1995)
Kalinske AA, Evans RR, Comparison of flotation and sedimentation in treatment of industrial wastes, Proceeding of Industrial Waste Conference 8th, pp. 64-71 (1953)
Kwak DH, Jung HJ, Kim SJ, Won CH, Lee JW, Sep. Sci. Technol., 40(14), 3001 (2005)
Lee JE, Choi WS, Lee JK, Korean J. Chem. Eng., 20(5), 942 (2003)
Lee JM, Biochemical engineering, Prentice-Hall, New Jersey, 2nd ed. (1992)
Lee JW, Jung HJ, Kwak DH, Chung PJ, Water Res., 39, 617 (2005)
Lee JW, Yang TH, Jung HJ, Kim SJ, Kwak DH, Water Res., submitted (2005)
Lee MG, Hano T, Korean J. Chem. Eng., 18(2), 178 (2001)
Leppinen DM, Dalziel SB, Linden PF, Water Sci. Technol., 43(8), 159 (2001)
Leppinen DM, Dalziel SB, J. Wat. Suppl: Res. & Tech.-AQUA, 53(8), 531 (2004)
Liers S, Baeyens J, Mochtar I, Water Environ. Res., 68(6), 1061 (1996)
Matsui Y, Fukushi K, Tambo N, J. Wat. Suppl: Res. & Tech.-AQUA, 47, 9 (1998)
Martins AMP, Pagilla K, Heijnen JJ, Loosdrecht MCM, Water Res., 38, 793 (2004)
Reid RC, Prausnitz JM, Poling BE, The properties of gases and liquids, McGraw-Hill, 4th ed. (1987)
Rodrigues RT, Rubio J, Miner. Eng., 16, 757 (2003)
Tambo N, Fukushi K, J. JWWA, 606, 22 (1985)
Tambo N, Fukushi K, Matsui Y, J. JWWA, 610, 2 (1985)
Vlyssides AG, Mai ST, Barampouti EMP, Ind. Eng. Chem. Res., 43(11), 2775 (2004)
Zabel T, J. AWWA, 77(5), 42 (1985)

[Referenced By]

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[1] American Public Health Association, American Water Works Association and Water Pollution Control Federation (APHA-AWWAWPCF), Standard methods for the examination of water and wastewater, 20th ed., Washington, DC (1998)

[2] Bourgeois JC, Walsh ME, Gagnon GA, Water Res., 38, 1173 (2004)

[3] Clift R, Grace JR, Weber ME, Bubbles, drops, and particles, Academic Press, New York (1978)

[4] Edzwald JK, Water Sci. Technol., 31(3-4), 1 (1995)

[5] Fukushi K, Tambo N, Matsui Y, Water Sci. Technol., 31(3-4), 37 (1995)

[6] Kalinske AA, Evans RR, Comparison of flotation and sedimentation in treatment of industrial wastes, Proceeding of Industrial Waste Conference 8th, pp. 64-71 (1953)

[7] Kwak DH, Jung HJ, Kim SJ, Won CH, Lee JW, Sep. Sci. Technol., 40(14), 3001 (2005)

[8] Lee JE, Choi WS, Lee JK, Korean J. Chem. Eng., 20(5), 942 (2003)

[9] Lee JM, Biochemical engineering, Prentice-Hall, New Jersey, 2nd ed. (1992)

[10] Lee JW, Jung HJ, Kwak DH, Chung PJ, Water Res., 39, 617 (2005)

[11] Lee JW, Yang TH, Jung HJ, Kim SJ, Kwak DH, Water Res., submitted (2005)

[12] Lee MG, Hano T, Korean J. Chem. Eng., 18(2), 178 (2001)

[13] Leppinen DM, Dalziel SB, Linden PF, Water Sci. Technol., 43(8), 159 (2001)

[14] Leppinen DM, Dalziel SB, J. Wat. Suppl: Res. & Tech.-AQUA, 53(8), 531 (2004)

[15] Liers S, Baeyens J, Mochtar I, Water Environ. Res., 68(6), 1061 (1996)

[16] Matsui Y, Fukushi K, Tambo N, J. Wat. Suppl: Res. & Tech.-AQUA, 47, 9 (1998)

[17] Martins AMP, Pagilla K, Heijnen JJ, Loosdrecht MCM, Water Res., 38, 793 (2004)

[18] Reid RC, Prausnitz JM, Poling BE, The properties of gases and liquids, McGraw-Hill, 4th ed. (1987)

[19] Rodrigues RT, Rubio J, Miner. Eng., 16, 757 (2003)

[20] Tambo N, Fukushi K, J. JWWA, 606, 22 (1985)

[21] Tambo N, Fukushi K, Matsui Y, J. JWWA, 610, 2 (1985)

[22] Vlyssides AG, Mai ST, Barampouti EMP, Ind. Eng. Chem. Res., 43(11), 2775 (2004)

[23] Zabel T, J. AWWA, 77(5), 42 (1985)