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首页> 外文期刊>Journal of Hazardous Materials >Decomposition and reformation pathways of PCDD/Fs during thermal treatment of municipal solid waste incineration fly ash
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Decomposition and reformation pathways of PCDD/Fs during thermal treatment of municipal solid waste incineration fly ash

机译：PCDD / FS的分解和改革途径在市政固体废物焚烧粉煤灰的热处理过程中

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Thermal treatment of municipal solid waste incineration (MSWI) fly ash (FA) allows heavy metals solidification, polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) decomposition, and environmentally stable materials production, but lacking advanced insights into PCDD/Fs dramatically limits its development. In this study, the decomposition and reformation of PCDD/Fs during thermal treatment of two typical fly ashes (loading 0.294 and 0.594 ng I-TEQ/g PCDD/Fs, respectively) are systematically investigated, under conditions of three heating temperature (500, 800, and 1100 degrees C) and two atmospheres (oxidative and inert). Over 95 % of PCDD/Fs in FA are effectively decomposed for all tests mainly via cyclic skeleton destruction accompanied by dechlorination, but reformation predominantly through de novo synthesis in off-gases significantly reduces the overall elimination efficiency. Moreover, both de novo synthesis and chlorination are enhanced as temperature increase promoting migrations of catalytic metals and chlorine, yet are weakened at the absence of oxygen, both of which are revealed by PCDD/F-signatures evolution. Catalytic metal is identified as the most critical factor accounting for PCDD/Fs reformation, which is also evidenced by kinetic models of de novo synthesis. Finally, the decomposition and reformation pathways during thermal treatment of fly ashes are proposed. The results pave the way for controlling PCDD/Fs reformation and improving the thermal treatment of fly ashes.
机译：市政固体废物焚烧（MSWI）粉煤灰（FA）允许重金属凝固，聚氯氯二苯甲酰硫氰酸（PCDD / FS）分解，以及环境稳定的材料生产，但缺乏大幅度的PCDD / FS的高级洞察力限制其发展。在本研究中，在三种加热温度的条件下，系统地研究了两个典型飞灰热处理期间PCDD / FS的分解和重整，在三种加热温度（500个）的条件下，系统地研究了（分别为0.294和0.594 Ng I-TEQ / GCDD / FS）（ 800和1100℃）和两个大气（氧化和惰性）。 FA中超过95％的PCDD / FS有效地分解了所有测试，主要通过循环骨架破坏伴随着脱氯，但主要通过Novo的废气中的改造显着降低了整体消除效率。此外，De Novo合成和氯化在促进催化金属和氯的升高迁移时增强了促进催化金属和氯，在没有氧的情况下被削弱，两者都被PCDD / F签名演变揭示。催化金属被鉴定为PCDD / FS改造的最关键因素核算，这也是通过Novo合成的动力学模型所证明的。最后，提出了粉煤灰热处理期间的分解和改革途径。结果为控制PCDD / FS改造并改善了飞灰的热处理来铺平了道路。

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