通过低温热感应的CaCO3寡合体结晶过程中,MSWI飞中PCDD/Fs降解的新见解
Yizhe Shen1, Jie Chen1, Dianwei Sun2
1State Key Laboratory of Clean Energy Utilization, Institute of Thermal Power Engineering of Zhejiang University, Hangzhou 310027, Zhejiang, China.
Waste management (New York, N.Y.)
|March 9, 2026
概括
碳酸寡合物飞灰的热处理有效降解持久性有机污染物 (PCDD/Fs). 这一过程稳定重金属并捕获二氧化碳,为城市固体废物飞灰管理提供了低能耗解决方案.
科学领域:
- 环境化学环境化学
- 材料科学 材料科学 材料科学
- 废物管理 废物管理
背景情况:
- 城市固体废物焚烧飞灰 (MSWI FA) 含有危险污染物,如多化二子-p-二氧化物和二酸 (PCDD/Fs).
- 传统的MSWI FA处理方法耗费大量能源,可能无法完全解决污染物降解和资源回收问题.
- 碳酸 (CaCO3) 寡合体技术为稳定重金属和隔离二氧化碳提供了潜力.
研究的目的:
- 研究热感应对CaCO3寡合物飞灰 (COFA) 中PCDD/Fs降解的疗效.
- 评估温度和大气 (空气与) 对PCDD/F降解效率的影响.
- 评估重金属稳定,PCDD/F降解和MSWI FA中的二氧化碳封存的综合益处.
主要方法:
- MSWI FA用CO2处理,以形成CaCO3寡合体,从而产生COFA.
- 在静态空气或气氛下,COFA在200至400°C的温度下经过热处理.
- 量化了PCDD/Fs降解率,重金属稳定性和碳化效率.
主要成果:
- 热诱导在COFA中显著降解PCDD/F,降解速度随温度增加.
- 在气氛下降解效率较高 (在300°C时超过95%),而在空气中降解效率高 (在400°C时高达92.40%).
- 该过程实现了固体阶段PCDD/Fs度满足资源利用标准 (17.43 ng-TEQ/kg) 与大量碳化 (17.2%).
结论:
- 热诱导COFA是一种有效的降解PCDD/F和稳定重金属的方法.
- 气氛增强了PCDD/Fs的降解,最大限度地减少了有毒异构体的形成.
- 这种综合方法为MSWI飞管理和资源回收提供了低能耗,实用的解决方案.
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