https://scholars.lib.ntu.edu.tw/handle/123456789/407859
標題: | Thermogravimetric analysis of activated sludge flocculated with polyelectrolyte | 作者: | Chu C.P. Lee D.J. Chang C.Y. |
公開日期: | 2000 | 卷: | 126 | 期: | 12 | 起(迄)頁: | 1082-1087 | 來源出版物: | Journal of Environmental Engineering | 摘要: | This work examines the thermal pyrolysis characteristics of polyelectrolyte-flocculated activated sludge at a heating rate up to 873 K by means of thermogravimetric analysis (TGA). Although the polyelectrolyte does not affect the pyrolysis rate of the sludge at a temperature of 8 or 14 K/min, using polyelectrolyte flocculation to charge neutralization appears to accelerate the pyrolysis process at 20 K/min. TGA/mass spectrometer tests were performed to identify the species released during pyrolysis of the sludges. A parallel-reaction kinetic model (Reactions 1 and 2) was applied to interpret the experimental data, with Reaction 1 corresponding to the release of C7H14 equivalents or lighter, and Reaction 2 corresponding to the heavier compounds. Using polyelectrolyte flocculation to change the neutralization point enhances Reaction 1 by transforming the heavier organics that are originally released at elevated temperature (Reaction 2) to the lighter compounds in the low-temperature regime (Reaction 1).This work examines the thermal pyrolysis characteristics of polyelectrolyte-flocculated activated sludge at a heating rate up to 873 K by means of thermogravimetric analysis (TGA). Although the polyelectrolyte does not affect the pyrolysis rate of the sludge at a temperature of 8 or 14 K/min, using polyelectrolyte flocculation to charge neutralization appears to accelerate the pyrolysis process at 20 K/min. TGA/mass spectrometer tests were performed to identify the species released during pyrolysis of the sludges. A parallel-reaction kinetic model (Reactions 1 and 2) was applied to interpret the experimental data, with Reaction 1 corresponding to the release of C7H14 equivalents or lighter, and Reaction 2 corresponding to the heavier compounds. Using polyelectrolyte flocculation to change the neutralization point enhances Reaction 1 by transforming the heavier organics that are originally released at elevated temperature (Reaction 2) to the lighter compounds in the low-temperature regime (Reaction 1). |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/407859 | ISSN: | 07339372 | DOI: | 10.1061/(ASCE)0733-9372(2000)126:12(1082) |
顯示於: | 化學工程學系 |
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