https://scholars.lib.ntu.edu.tw/handle/123456789/408207
標題: | Unidirectional freezing of waste-activated sludge: The presence of sodium chloride | 作者: | Chu C.P. Feng W.H. Tsai Y.H. Lee D.J. |
公開日期: | 1997 | 卷: | 31 | 期: | 5 | 起(迄)頁: | 1512-1517 | 來源出版物: | Environmental Science and Technology | 摘要: | This paper experimentally addressed the discrepancies in sludge freezing literature regarding the effect of electrolyte (sodium chloride) on the subsequent freeze/thawed sludge dewaterability. Waste-activated sludge is vertically frozen at fixed freezing speeds with sodium chloride concentration as a parameter. Results obtained herein demonstrate that if the sludge is completely frozen, regardless of the electrolyte, the sludge filterability can be markedly improved. However, the associated sludge settle ability and the final sediment height do not alter much except when flocs gross migration occurs. Adding NaCl retards the flocs gross migration, thereby reducing the corresponding critical freezing speed. We speculate that the transition- layer freezing point suppression, the double-layer compression, and the initiation of wavy ice front are possible factors for the electrolyte effects. However, whether the double-layer compression is an influential mechanism in freeze/thaw treatment still remains unclear. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/408207 | ISSN: | 0013936X | DOI: | 10.1021/es960781x |
顯示於: | 化學工程學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。