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KMID : 1024520090180060675
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Journal of the Environmental Sciences
2009 Volume.18 No. 6 p.675 ~ p.682
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A Study on the Solubilization and Dewaterability of Ultrasonically Treated Wastewater Sludge
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Youn You-Sik
Kim Dong-Jin
Yoo Ik-Keun
Ahn Dae-Hee
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Abstract
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Sludge minimization from wastewater treatment plant is becoming more important to save disposal costs and to contribute to sustainable development. For the reduction of sludge production, solubilization and dewaterability of sludge are important factors in sludge processing. Ultrasonic treatment has been used to enhance sludge solubility and dewaterability with anaerobic digestion sludge, primary sludge, and activated sludge. At the ultrasonic power of 0.2 kW/L for 1 hour, anaerobic sludge and activated sludge showed higher solubilization efficiency than the primary sludge in terms of COD, proteins, and suspended solids. Ultrasonic treatment decreased sludge dewaterability and sludge settling characteristics up to 720 kJ/L of ultrasonic energy. In conclusion, ultrasonic treatment was effective for sludge solubilization but it deteriorate dewaterability (specific resistance) and settling characteristics (SVI) of sludge at the experimental conditions.
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KEYWORD
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Dewaterability, Hydrolysis, Sludge, Solubilization, Ultrasonic treatment
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