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http://dx.doi.org/10.5762/KAIS.2012.13.11.5628

A study of on site Pilot plant test of drying sewage sludge using Chain crusher flash dryer  

Ahn, June-Shu (Department of Environmental Engineering, Daejin University)
Kim, Byung-Tae (Department of Environmental Engineering, Daejin University)
Cho, Jung-Ho (Department of Chemical Engineering, Kongju National University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.13, no.11, 2012 , pp. 5628-5636 More about this Journal
Abstract
Effective drying method of sewage sludge is researched in this study. To dry the sludge, chain crusher flash dryer was adopted to remove moisture content in the cell which is mostly responsible for the sludge moisture content. And Pilot plant experiment was conducted in real life sewage treatment plant to study effect and characteristics of operating conditions. Operating variables include sludge feeding rate, rotational speed of chain, process temperature and feed moisture content. As rotational speed of chain increased, product yield of sludge increased, and the performance of the testing system increased. And, as process temperature increased, the sludge drying efficiency increased. It is found that optimum feed moisture content is at 60% which shows the maximum sludge product yield and about 10 moisture content(%) of sludge product. Sludge feed rate showed optimal value, and when the sludge feed rate is exceeded, sludge product yield did not increased but the amount of residue increased. Pilot plant experiment results are as follow. The optimal condition for the rotational speed of chain 1600rpm(max. speed), final sludge discharge temperature $80^{\circ}C$, feed moisture content 60%, and feed rate 60kg/h. When the plant was operated at the optimal conditions, the final product showed fairly good results such as sludge product yield 85.5%, moisture content 11.0% and sludge drying efficiency 81.7%.
Keywords
Drying of sewage sludge; Chain crusher flash dryer;
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Times Cited By KSCI : 2  (Citation Analysis)
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