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http://dx.doi.org/10.5762/KAIS.2014.15.6.4019

Dewaterability Improvement and Volume Reduction of Bio-Solid using Ultrasonic Treatment  

Park, Cheol (Greentech Environmental Consulting Co.)
Ha, Jun Soo (School of Civil, Environmental and Architectural Engineering, Korea University)
Kim, Young Uk (Department of Civil and Environmental Engineering, Myongji University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.15, no.6, 2014 , pp. 4019-4023 More about this Journal
Abstract
This study examined the effectiveness of ultrasound on enhancing the dewaterability and volume reduction of bio solids from a waste treatment plant. The test specimen was obtained from a storage tank immediately before the dewatering process at a local treatment plant. The test conditions included the energy levels of ultrasonic waves and treatment time. The tests were undertaken using three types of different treatment processors (7 liter, 1 ton, 7 ton container). The capillary suction time (CST) and the viscosity of sludge, which is one of the influencing factors for dewaterbility, were obtained under various test conditions. The results showed that ultrasound increases the CST of the raw specimens, whereas a significant reduction (20 % of the maximum value) of CST occurred in the sample with ultrasound and flocculent. The decrease in viscosity reached 40 % of the maximum value. A centrifugal test was performed to examine the characteristics of the sludge settlement. The settling rate and time required to reach the final values were both enhanced by the ultrasonic energy. An ultrasonic treatment is potentially useful tool for reducing the amount of released sludge. To examine the possible use of field application, the real scale sonic processor was designed and operated. The results were similar (50 % of the maximum value) to those of laboratory experiments.
Keywords
Bio solid; Centrifugal separation; CST; Flocculent; Sludge dewatering;
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Times Cited By KSCI : 5  (Citation Analysis)
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