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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received March 19, 2009
Accepted October 2, 2009

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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

Jung Eun Lee^† Jae Keun Lee¹ 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

jelee@pusan.ac.kr

Korean Journal of Chemical Engineering, March 2010, 27(3), 862-867(6), 10.1007/s11814-010-0136-4

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Abstract

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×_x000D_ 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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