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http://dx.doi.org/10.17137/Korrae.2014.22.1.27

A Study on the Viscosity Characteristics of Dewatered Sewage Sludge according to Thermal Hydrolysis Reaction  

Song, Hyoung Woon (Clean Energy Team, Institute for Advanced Engineering)
Han, Seong Kuk (Clean Energy Team, Institute for Advanced Engineering)
Kim, Choong Gon (Dohwa Engineering Co., Ltd.)
Shin, Hyun Gon (Dept. of Energy & Environmental Engineering, Shinhan University)
Publication Information
Journal of the Korea Organic Resources Recycling Association / v.22, no.1, 2014 , pp. 27-34 More about this Journal
Abstract
demand for a low-cost treatment technology is high because the sewage sludge has an 80% or higher water content and a high energy consumption cost. This study apply the thermal hydrolysis reaction that consumes a small amount of energy for sludge treatment. The purpose of this study is to quantify the viscosity of sewage sludge according to reaction temperature. we measured continuously the torque of dewatered sludge by the reaction temperature. As the reaction temperature increased, the dewatered sludge is thermal hydrolysis under a high temperature and pressure. Therefore, the bond water in the sludge cells comes out as free water, which changes the dewatered sludge from a solid phase to slurry of a liquid phase. The results of the viscosity measurements according to the reaction temperature showed that the viscosity was very high at $270,180kg/m{\cdot}sec$ at a temperature of 293K, but rapidly decreased with increases in the reaction temperature to $12kg/m{\cdot}sec$ at a temperature of 400K and to $4kg/m{\cdot}sec$ at a temperature of 460K or higher, similar to the changes in the viscosity of water. And we was obtained the viscosity function of boundary condition for the optimal design of thermal hydrolysis reactor by numerical modeling based on the this results.
Keywords
Viscosity; Sewage sludge; Thermal hydrolysis; Torque; Bound water;
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Times Cited By KSCI : 1  (Citation Analysis)
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