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Distribution of PCDD/Fs over the three product phases in wet sewage sludge pyrolysis
Journal of Analytical and Applied Pyrolysis ( IF 6 ) Pub Date : 2018-08-01 , DOI: 10.1016/j.jaap.2018.04.005
Qianjin Dai , Junming Wen , Xuguang Jiang , Liyan Dai , Yuqi Jin , Fei Wang , Yong Chi , Jianhua Yan

Abstract Pyrolysis of wet sewage sludge was conducted using (1) conventional pyrolysis (CP) by electric heating and (2) microwave pyrolysis (MP) by microwave heating separately to obtain the emission characteristics of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) during pyrolysis. Tests were conducted in parallel on two set-ups. The 4–8-chlorinated PCDD/Fs were determined by gas chromatography/mass spectroscopy (GC/MS) in each of the resulting product phases (gas, liquid and solid phase). During the evolution of PCDD/Fs mainly migration rather than formation of congeners was observed, while liquid phase were dominant for PCDD/Fs amount. Effects of distillation and dechlorination appeared in the yield of gas and liquid phase. Totally chlorinated congeners such as OCDD and OCDF were mostly dechlorinated to lower chlorinated congeners. PCDD/Fs in gas phase and liquid phase increased along with power increase for MP and peaked before 700 °C for CP, while the amount differed little for solid phase. It was indicated from CP that PCDD/Fs were decomposed at 800 °C for wet sewage sludge pyrolysis. PCDD/Fs distribution in the three resulting product phases can be well explained by the boiling point, wherein OCDF was always relatively more difficult to be distillated than other congeners. MP produced equivalent quantity of PCDD/Fs compared with CP, which indicated the absence of special effect (nonthermal effect) of microwave heating on PCDD/Fs evolution.

中文翻译:

PCDD/Fs 在湿污泥热解过程中三个产物相的分布

摘要 湿污泥热解分别采用(1)电加热常规热解(CP)和(2)微波加热微波热解(MP)分别获得多氯二苯并对二恶英和二苯并呋喃(PCDD/ Fs) 在热解过程中。测试在两个设置上并行进行。通过气相色谱/质谱 (GC/MS) 测定每个所得产物相(气相、液相和固相)中的 4-8-氯化 PCDD/F。在 PCDD/Fs 的演化过程中,主要观察到迁移而不是同系物的形成,而液相占 PCDD/Fs 量的主导地位。蒸馏和脱氯的影响主要体现在气相和液相的产率上。OCDD 和 OCDF 等全氯化同系物大多脱氯为低氯化同系物。气相和液相中的 PCDD/Fs 随 MP 功率的增加而增加,CP 在 700 °C 前达到峰值,而固相的含量差异不大。CP 表明 PCDD/Fs 在 800 °C 下分解,用于湿污水污泥热解。PCDD/Fs 在三个产物相中的分布可以用沸点很好地解释,其中 OCDF 总是比其他同类物更难蒸馏。MP与CP产生等量的PCDD/Fs,表明微波加热对PCDD/Fs的演化没有特殊影响(非热效应)。而固相用量差别不大。CP 表明 PCDD/Fs 在 800 °C 下分解,用于湿污水污泥热解。PCDD/Fs 在三个产物相中的分布可以用沸点很好地解释,其中 OCDF 总是比其他同类物更难蒸馏。MP与CP产生等量的PCDD/Fs,表明微波加热对PCDD/Fs的演化没有特殊影响(非热效应)。而固相用量差别不大。CP 表明 PCDD/Fs 在 800 °C 下分解,用于湿污水污泥热解。PCDD/Fs 在三个产物相中的分布可以用沸点很好地解释,其中 OCDF 总是比其他同类物更难蒸馏。MP与CP产生等量的PCDD/Fs,表明微波加热对PCDD/Fs的演化没有特殊影响(非热效应)。
更新日期:2018-08-01
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