Modeling of Sludge Behavior in a Steam Dryer |
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| Authors: | Mitsuo Tazaki Hiroshi Tsuno Masaki Takaoka Koh Shimizu |
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| Affiliation: | 1. Technical Engineering Department , Senshu Koki Co., Ltd. , Sakai City, Osaka, Japan ta-mitsuo@senshu-koki.com;3. Department of Environmental Engineering , Graduate School of Engineering, Kyoto University , Kyoto City, Kyoto, Japan;4. 21st Century Water Club , Tokyo, Japan |
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| Abstract: | Steam dryers are in widespread use for sewage sludge treatment. The effectiveness of the steam dryer could be improved by increasing the drying rate, which is influenced by the movement of the sludge in the dryer. Therefore, it is necessary to understand the movement of sludge and water evaporation in the dryer. In this study, tracers were used to elucidate the behavior of sludge in the dryer. The experiment confirmed that sludge did not simply flow in one direction; instead, part of the sludge flowed in the reverse direction (back-mixing). A tanks-in-series model analysis was performed to analyze the back-mixing phenomenon. This analysis provided insight into the behavior of sludge in the dryer, and the drying rate of each segment was determined. |
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| Keywords: | Back-mixing Movement of sludge Residence time in dryer Sewage sludge dryer Tanks-in-series model |
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