A study of the improvement in dewatering behavior of wastewater sludge through the addition of fly ash |
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| Authors: | Jung Eun Lee Jae Keun Lee Dong Soo Kim |
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| Affiliation: | (1) Laboratory for Molecular Ecology, Department of Environmental Health, Science, and Policy, University of California, 92697–7070 Irvine, CA, USA;(2) Ciphergen Biosystems, Inc., 94555 Fremont, CA, USA;; |
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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 2.9×1014 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 2.9×1013 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. |
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