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http://dx.doi.org/10.4491/KSEE.2013.35.1.023

Enhancement of Dewaterability of Sewage Sludge by Ultrasonification and Electric Field Treatment  

Mo, Woojong (Department of Environmental Engineering, Inha University)
Han, Jisun (Department of Environmental Engineering, Inha University)
Ahn, Changmin (Department of Environmental Engineering, Inha University)
Yoon, Soonuk (Department of Environmental Engineering, Inha University)
Seok, Heejung (Department of Environmental Engineering, Inha University)
Kim, Changgyun (Department of Environmental Engineering, Inha University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.35, no.1, 2013 , pp. 23-30 More about this Journal
Abstract
The sludge disposal is a major economic factor in the sewage treatment facility operation. Moreover, since the ocean dumping will be prohibited by Korean environmental law from 2013, sludge should be eliminated or sludge volumetric reduction should be performed urgently. In this study, improvement of the sewage sludge dewaterability was investigated by ultrasound and electric field treatment. Sludge was treated by a single or in combination of either the electric field or ultrasound on a pilot pretreatment facility, then it was dewatered by lab-scale filter press. The operating input energy of ultrasound device was varied from 225~1,200 kJ/L and electric field device was varied from 4.5~24 kJ/L. The water contents of dewatered sludge cake treated with ultrasound (1,200 kJ/L) and combination of ultrasound/electric field (1,224 kJ/L) were decreased 10~12% by comparing non-treated sludge. At that time, water contents were 65~66%. The combination treatment of ultrasound/electric field was effective to reduce water content of dewatered sludge cake, however, water content was not changed by a single treatment of electric field because of low energy density.
Keywords
Sludge; Dewaterability; Ultrasound; Electric Field; Sludge Pre-treatment;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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