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| Thermal degradation kinetic property of waste salt during thermal treatment |
| LI Wei-shi1,2, HUANG Ze-chun2, LEI Guo-yuan1, XU Ya1,2, HUANG Ai-jun3, LIU Yu-qiang2, HUANG Qi-fei2 |
1. School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;
2. Research Institute of Soil and Solid Waste Environment, Chinese Research Academy of Environment Sciences, Beijing 100012, China;
3. Xin Zhongtian Environment Protection Co., Ltd, Chongqing 400060, China |
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Abstract To explore the suitability of thermal treatment of pesticide waste salt, three typical pesticide waste salt, prochloraz, nicosulfuron and glyphosate, were studies by thermogravimetric analysis and kinetic model. The experimental result indicated prochloraz waste salt had a significant weightlessness phase, and its weight maintained constant basically after the temperature was higher than 600℃. Nicosulfuron and glyphosate wast salt had two significant weightlessness phase, and the rate of weight loss was significantly slower at temperatures above 300℃ and 450℃, respectively. The weightlessness processes of the combustion and pyrolysis of three types of waste salt were similar, which indicated that the existence of oxygen would not affect the thermal treatment process. Moreover, combined with the thermal treatment kinetic parameter, the thermal treatment of waste salt was complex reaction processes. The activation energy required for the combustion and pyrolysis of the nicosulfuron waste salt was similar to that of 0.297~5.894kJ/mol. And the thermal treatment of the nicosulfuron waste salt was most likely to occur. The activation energy of the combustion of prochloraz and glyphosate waste salt was lower than pyrolysis activation energy, indicating that oxygen could promote the thermal treatment of prochloraz and glyphosate waste salt. The thermal treatment would be in the air atmosphere.
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Received: 26 December 2017
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