水泥窑热工条件下十溴二苯醚的热分解规律  

THERMAL DECOMPOSITION LAW OF BDE-209 IN CEMENT KILN UNDER THERMAL CONDITION

作　　者：樊美蓉 张尚毅 杨延梅[2] 杨金忠[1] 杨玉飞[1] 谢真 FAN Meirong;ZHANG Shangyi;YANG Yanmei;YANG Jinzhong;YANG Yufei;XIE Zhen(Chinese Research Academy of Environmental Sciences,Beijing 100012,China;College of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]中国环境科学研究院,北京100012 [2]重庆交通大学河海学院,重庆400074

出　　处：《环境工程》2022年第10期98-104,111,共8页Environmental Engineering

基　　金：国家自然科学基金项目(51778592);固废资源化项目(2018YFC1900102)。

摘　　要：基于水泥窑热工条件参数,结合响应曲面设计基本原理,开展了十溴二苯醚(BDE-209)热分解规律及影响因素研究,并分析了BDE-209的脱溴路径。结果表明:烟气中多溴二苯醚(PBDEs)含量随着溴取代数降低而降低;不同PBDEs单体受不同因素影响明显,烟气中BDE-209浓度主要受样品中原始浓度和温度的影响,九溴二苯醚和八溴二苯醚浓度主要受温度和氧气交互作用的影响;结合文献研究与本实验结果推测BDE-209在水泥窑热工条件下的最主要的两条降解路径,生成九溴二苯醚的最主要路径是由BDE-209脱去一个溴生成BDE-207;生成八溴二苯醚的最主要路径是由BDE-209脱去一个溴生成BDE-206,再由BDE-206脱去一个溴再生成BDE-203。明确BDE-209的热分解规律及影响因素,能够为水泥窑热工条件下处置含PBDEs废物提供理论支撑。Based on the parameters of cement kiln thermal conditions and the basic principle of response surface design,a study on the thermal decomposition law and influencing factors of BDE-209 was carried out,and the debromination path of BDE-209 was analyzed.The results showed that the content of PBDEs in flue gas decreased with the decrease of bromine substitution number.Different PBDEs monomers were significantly influenced by different factors,and the concentration of BDE-209 in the flue gas was mainly influenced by the original concentration and temperature in the sample,while the concentrations of nine and octa-BDE were mainly affected by the interaction of temperature and oxygen.Combining the literature study with the experiment results,it was assumed that the main debromination pathways of BDE-209 including two main degradation paths under the thermal conditions of the cement kiln.The main path to generate nine brominated diphenyl ether was to remove one bromine from BDE-209 to generate BDE-207.The main path to generate octabromodiphenyl ether was to remove one bromine from BDE-209 to generate BDE-206,and then remove one bromine from BDE-206 to generate BDE-203.The clarification of the thermal decomposition law of BDE-209 and the influencing factors could provide theoretical support for the disposal of waste containing PBDEs in cement kilns under thermal working conditions.

关 键 词：十溴二苯醚(BDE-209) 水泥窑 响应曲面法 影响因素 分解规律 

分 类 号：TQ172.622[化学工程—水泥工业] X505[化学工程—硅酸盐工业]