Distribution characteristics and formation mechanisms of PCDD/Fs during pyrolysis and gasification of municipal solid waste

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management Pub Date : 2025-08-12 DOI:10.1016/j.wasman.2025.115072

Xiaoqing Lin , Jiangtao Qian , Yuxuan Ying , Weican Xiang , Yunfeng Ma , Jianhua Yan , Xiaodong Li

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Abstract

Pyrolysis gasification (PG) technology is a promising waste disposal technology, which is more efficient and cleaner compared with incineration technology. However, few work has studied the generation characteristics of polychlorinated dibenzo-p-dioxin and furans (PCDD/Fs) and the influencing factors in the PG process. This study investigates the effects of air ratio (AR) and gasification temperature on the generation and distribution of PCDD/Fs during the PG process of municipal solid waste (MSW). PCDD/Fs mainly distribute in the gas- and oil-phase. PCDD/Fs are generated highest levels at 0.3-AR and 700 °C (477.0 ng/g MSW and 44.4 ng I-TEQ/g MSW), which could be attributed to the generation of PCDD/F precursors enhanced by the promotion of oxidation reactions. Gasification temperature positively correlates with PCDD/F generation and generates the highest concentrations of PCDD/Fs at 0.2-AR and 800 °C (57.6 ng/g MSW and 5.0 ng I-TEQ/g MSW). In addition, the increased temperature promotes the generation of high-chlorinated congeners through the chlorination pathway. By adjusting the key parameters of temperature and AR, the inhibition and distribution of PCDD/F generation in the MSW PG process can be effectively regulated.

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城市生活垃圾热解气化过程中PCDD/Fs的分布特征及形成机理

热解气化（PG）技术是一种很有前途的垃圾处理技术，与焚烧技术相比，它更高效、更清洁。然而，对多氯二苯并对二恶英和呋喃（PCDD/Fs）在PG工艺中的生成特征及影响因素的研究较少。研究了空气比（AR）和气化温度对城市生活垃圾气化过程中PCDD/Fs产生和分布的影响。PCDD/Fs主要分布在气相和油相。在0.3-AR和700°C （477.0 ng/g MSW和44.4 ng I-TEQ/g MSW）时，PCDD/F的生成最高，这可能是由于氧化反应的促进促进了PCDD/F前体的生成。气化温度与PCDD/F的生成呈正相关，在0.2-AR和800°C时PCDD/F的浓度最高（57.6 ng/g MSW和5.0 ng I-TEQ/g MSW）。此外，温度的升高促进了通过氯化途径产生高氯化同系物。通过调节温度和AR等关键参数，可以有效调节城市生活垃圾PG工艺中PCDD/F生成的抑制和分布。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Waste management 环境科学-工程：环境

CiteScore

15.60

自引率

6.20%

发文量

492

审稿时长

39 days

期刊介绍： Waste Management is devoted to the presentation and discussion of information on solid wastes,it covers the entire lifecycle of solid. wastes. Scope: Addresses solid wastes in both industrialized and economically developing countries Covers various types of solid wastes, including: Municipal (e.g., residential, institutional, commercial, light industrial) Agricultural Special (e.g., C and D, healthcare, household hazardous wastes, sewage sludge)