A study of the improvement in dewatering behavior of wastewater sludge through the addition of fly ash

Jung Eun Lee; Jae Keun Lee; Dong Soo Kim

Korean Journal of Chemical Engineering, Vol.27, No.3, 862-867, March, 2010

DOI10.1007/s11814-010-0136-4 Export Citation

A study of the improvement in dewatering behavior of wastewater sludge through the addition of fly ash

Jung Eun Lee^†, Jae Keun Lee¹, and Dong Soo Kim²

ILIC, Pusan National University, Busan 609-735, Korea
¹Mechanical Engineering, Pusan National University, Busan 609-735, Korea
²Department of Environmental Engineering, Ewha Womans University, Seoul 120-750, Korea

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Wastewater sludge is classified as a difficult dewatering material (DDM) due to the high cake specific resistance (CSR). On the other hand, fly ash is classified as an easy dewatering material (EDM), which suggests that it might be able to improve the dewaterability of wastewater sludge. The water content and cake specific resistance of dewatered sludge without the addition of fly ash were 80% and 2.9×10^(14) kg/m, respectively. When 50% (by dry weight) fly ash was added to the sludge, the water content and cake specific resistance decreased to 29.4% and 2.9× 10^(13) kg/m, respectively. The cake specific resistance and water content decreased with increasing fly ash additions. Therefore, the production of sludge cake can be reduced by adding fly ash, which can help minimize the social and environmental problems caused by the need to dispose of wastewater sludge.

Keywords:Dewatering;Wastewater Sludge;Fly Ash;Difficult Dewatering Material;Easy dewatering Material;Cake Specific Resistance

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[1] Vijh AK, Drying Technology, 17, 585 (1999)

[2] Lee JE, Lee JK, Kim MJ, IWA 3rd World Water Congress, e21155a (2002)

[3] Lee JK, Shin HS, Park CJ, Lee CG, Lee JE, Kim YW, Korean J. Chem. Eng., 19(1), 41 (2002)

[4] Lee JE, Lee JK, Choi HK, Drying Technology, 25, 1985 (2007)

[5] Lee JE, Drying Technology, 24, 680 (2006)

[6] Nelson RF, Brattlof BD, Journal WPCF, 51, 1024 (1979)

[7] Thapa KB, Qi Y, Clayton SA, Hoadley AFA, Water Res., 43, 623 (2009)

[8] David EJ, Tapan KB, Journal WPCF, 42, R125 (1970)

[9] Mayer E, Chem. Eng. J., 80(1-3), 233 (2000)

[10] Hunter RJ, Zeta potential in colloid science principles and applications, Academic Press, New York, 32 (1981)

[11] Ruth BF, Ind. Eng. Chem., 27, 708 (1935)