Removal of Phosphate Using Coal Fly Ash from a Thermal Power Station

Suk Soon Choi; Jae Chun Chung; Sung Ho Yeom

Journal of Industrial and Engineering Chemistry, Vol.11, No.5, 638-642, September, 2005

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Removal of Phosphate Using Coal Fly Ash from a Thermal Power Station

Suk Soon Choi^†, Jae Chun Chung¹, and Sung Ho Yeom²

Department of Environmental Engineering, Semyung University, Jecheon 390-711, Korea
¹Division of Environmental Engineering, Yonsei Univesity, Wonju 220-710, Korea
²Department of Environmental and Applied Chemical Engineering, Kangnung National University, Kangneung 210-702, Korea

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Coal fly ash is a cheap and abundant industrial waste obtained from thermal power stations. In this study, we used it as an adsorbent for the removal of phosphate from aqueous solution. The optimal conditions for phosphate removal were an initial pH of 4.0, a temperature of 60 ℃, and a coal fly ash dosage of 3.5 g/L. The removal efficiencies for 10, 25, 50, and 100 mg/L of phosphate under the optimal conditions were all over 90%. In addition, the coal fly ash was able to remove TOC (Total Organic Carbon) simultaneously with a removal efficiency over 85%. To improve the adsorption capacity of the coal fly ash, it was treated with chemical reagents such as HCI, NaOH, EDTA, and NH4HCO3. The adsorption capacity of the coal fly ash treated with 11 M HC1 was four times higher than that of raw coal fly ash. These results can be used as economical and practical engineering data for the development of phosphate removal processes.

Keywords:phosphate removal;coal fly ash;optimal conditions;adsorption capacity;HCl treatment

[References]

Choeong KH, Choi HI, Jung OJ, Kim YH, Kor. J. Soc. Water Quality, 19, 43 (2003)
Ozacar M, Chemosphere, 51, 321 (2003)
Karaca S, Gurses A, Ejder M, Acikyildiz M, J. Colloid Interface Sci., 277(2), 257 (2004)
Murakami A, Jap. J. Soc. Water Envinon., 10, 187 (1987)
Yildiz E, Sep. Purif. Technol., 35, 241 (2004)
Lee MG, Cheon JK, Kam SK, J. Ind. Eng. Chem., 9(2), 174 (2003)
Lee HS, in Workshop of utilization of coal fly ash, H. S. Chung and I. H. Baek Eds., pp. 3~15, Seoul, Korea (2002)
Agyei NM, Strydom CA, Potgieter JH, Cem. Concr. Res., 2134, 1 (2002)
Ugurlu A, Saman B, Environ. Int., 24, 911 (1998)
Sakadevan K, Bavor HJ, Water Res., 32, 393 (1998)
Tanada S, Kabayama M, Kawasaki N, Sakiyama T, Nakamura T, Araki M, Tamura T, J. Colloid Interface Sci., 257(1), 135 (2003)
Cheung KC, Venkitachalam TH, Chemosphere, 41, 243 (2000)
Agyei NM, Strydom CA, Potgieter JH, Cem. Concr. Res., 30, 823 (2000)
Andrew DE, Lenore S, Arnold E, Standard methods for the examination of water and waste-water, 19th Edn., pp. 106~114, American Public Health Association, Washington, DC (1995)
Hong KM, Kim MS, Chung JG, J. Korean Ind. Eng. Chem., 14(3), 281 (2003)
Hu J, Lo IMC, Chen G, Water Sci. Technol., 50, 139 (2004)
Pradhan J, Das J, Das S, Thakur RS, J. Colloid Interface Sci., 204(1), 169 (1998)

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[1] Choeong KH, Choi HI, Jung OJ, Kim YH, Kor. J. Soc. Water Quality, 19, 43 (2003)

[2] Ozacar M, Chemosphere, 51, 321 (2003)

[3] Karaca S, Gurses A, Ejder M, Acikyildiz M, J. Colloid Interface Sci., 277(2), 257 (2004)

[4] Murakami A, Jap. J. Soc. Water Envinon., 10, 187 (1987)

[5] Yildiz E, Sep. Purif. Technol., 35, 241 (2004)

[6] Lee MG, Cheon JK, Kam SK, J. Ind. Eng. Chem., 9(2), 174 (2003)

[7] Lee HS, in Workshop of utilization of coal fly ash, H. S. Chung and I. H. Baek Eds., pp. 3~15, Seoul, Korea (2002)

[8] Agyei NM, Strydom CA, Potgieter JH, Cem. Concr. Res., 2134, 1 (2002)

[9] Ugurlu A, Saman B, Environ. Int., 24, 911 (1998)

[10] Sakadevan K, Bavor HJ, Water Res., 32, 393 (1998)

[11] Tanada S, Kabayama M, Kawasaki N, Sakiyama T, Nakamura T, Araki M, Tamura T, J. Colloid Interface Sci., 257(1), 135 (2003)

[12] Cheung KC, Venkitachalam TH, Chemosphere, 41, 243 (2000)

[13] Agyei NM, Strydom CA, Potgieter JH, Cem. Concr. Res., 30, 823 (2000)

[14] Andrew DE, Lenore S, Arnold E, Standard methods for the examination of water and waste-water, 19th Edn., pp. 106~114, American Public Health Association, Washington, DC (1995)

[15] Hong KM, Kim MS, Chung JG, J. Korean Ind. Eng. Chem., 14(3), 281 (2003)

[16] Hu J, Lo IMC, Chen G, Water Sci. Technol., 50, 139 (2004)

[17] Pradhan J, Das J, Das S, Thakur RS, J. Colloid Interface Sci., 204(1), 169 (1998)