Characteristics of heavy metal migration in the gasification-combustion process of rural solid waste: Influencing factors and mechanisms

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

Waste management Pub Date : 2024-10-09 DOI:10.1016/j.wasman.2024.09.031

Wen Teng , Zi You , Yanfen Liao , Zhuofan Chen , Xin Qi , Xiaoqian Ma

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引用次数: 0

Abstract

The miniaturized gasification-combustion model has potential advantages in treatment of rural solid waste (RSW) in China. In this study, the gasification-combustion technology concerning air-staged technology was employed in the treatment of seven combustible components in RSW, focusing on the analysis of heavy metal migration characteristics. Firstly, a comparison was made between combustion and gasification-combustion regarding the migration characteristics of heavy metals, demonstrating that gasification-combustion effectively reduces the volatilization rate of heavy metals. The largest reduction in volatility was 12.99 % for Cu. Secondly, this study explored reaction temperatures and oxygen concentration in the gasification zone, concluding that under experimental conditions mentioned herein, optimal gasification temperatures for curing heavy metals were determined to be 700 °C while maintaining an optimal ratio of air (RA) at 0.5 during gasification. Finally, the interaction of inorganic elements with different components on heavy metal migration was revealed by co-gasification-combustion of equal mass mixture of two components. The P, S, Cl contents and the inorganic mineralogical composition of the RSW are the key factors influencing the transport properties of heavy metals. The two-component synergistic effect of RSW studied in this paper has guiding significance for limiting the proportion of RSW components to control heavy metal emission in gasification-combustion process.

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农村固体废物气化-燃烧过程中重金属迁移的特征：影响因素和机制。

小型化气化燃烧模式在中国农村固体废弃物（RSW）处理中具有潜在优势。本研究采用气化-燃烧技术处理农村固废中的七种可燃成分，重点分析重金属的迁移特性。首先，比较了燃烧法和气化燃烧法对重金属迁移特性的影响，结果表明气化燃烧法能有效降低重金属的挥发率。铜的挥发率降低幅度最大，达到 12.99%。其次，该研究探讨了气化区的反应温度和氧气浓度，得出结论认为，在上述实验条件下，固化重金属的最佳气化温度确定为 700 ℃，同时在气化过程中保持最佳空气比例（RA）为 0.5。最后，通过两种成分的等质量混合物的共同气化-燃烧，揭示了无机元素与不同成分对重金属迁移的相互作用。P、S、Cl 含量和 RSW 的无机矿物成分是影响重金属迁移特性的关键因素。本文研究的 RSW 双组分协同效应对限制 RSW 组分比例以控制气化-燃烧过程中的重金属排放具有指导意义。

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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)