Evaluation of Fly Ash Composition from Municipal Solid Waste Incinerators: The Role of the Incinerator Type and Flue Gas Deacidification Process.

IF 3.9 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Toxics Pub Date : 2025-07-14 DOI:10.3390/toxics13070588

Xuetong Qu, Yanan Wang, Feifei Chen, Chuqiao Li, Yunfei He, Jibo Dou, Shuai Zhang, Jiafeng Ding, Hangjun Zhang, Yuchi Zhong

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引用次数: 0

Abstract

The resource utilization potential and environmental impact of fly ash from municipal solid waste incinerators (MSWIs) have attracted wide attention. In this study, four MSWIs in Hangzhou, Zhejiang Province were selected to systematically evaluate the effects of different incinerator types and flue gas deacidification processes on fly ash's oxide and heavy metal components and their temporal changes as well as conduct risk assessment. The results showed that the contents of MgO, Al₂O₃, SiO₂, and Fe₂O₃ in the grate furnace fly ash were significantly lower than those in the fluidized bed fly ash, but the compressive strength of its fly ash was high. Chemicals added during the flue gas deacidification process such as CaO and NaHCO₃ significantly affected the contents of CaO and Na₂O. In addition, heavy metals such as Cu, Mn, Cr, and Ni were mainly distributed in the fluidized bed fly ash, while heavy metals such as Pb and Cd were mainly collected in the grate furnace fly ash. The concentrations of various components in the fly ash fluctuated but were not significant under different time dimensions. Risk assessment indicated that heavy metals such as Cd, Pb, and Sb posed a high risk. This study is expected to provide theoretical support for the safe management and resource utilization of fly ash.

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城市生活垃圾焚烧炉飞灰组成评价：焚烧炉类型和烟气脱酸工艺的作用。

城市生活垃圾焚烧飞灰的资源化利用潜力及其对环境的影响引起了人们的广泛关注。本研究以浙江省杭州市4个城市生活垃圾填埋场为研究对象，系统评价了不同焚烧炉类型和烟气脱酸工艺对飞灰氧化物和重金属组分及其时间变化的影响，并进行了风险评估。结果表明：篦炉粉煤灰中MgO、Al2O3、SiO2和Fe2O3的含量明显低于流化床粉煤灰，但其粉煤灰的抗压强度较高；烟气脱酸过程中添加的化学物质CaO和NaHCO3对CaO和Na2O的含量有显著影响。此外，Cu、Mn、Cr、Ni等重金属主要分布在流化床飞灰中，Pb、Cd等重金属主要收集在篦炉飞灰中。粉煤灰中各组分的浓度在不同时间尺度下均有波动，但不显著。风险评价表明，镉、铅、锑等重金属具有较高的危险性。本研究有望为粉煤灰的安全管理和资源化利用提供理论支持。

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来源期刊

Toxics Chemical Engineering-Chemical Health and Safety

CiteScore

4.50

自引率

10.90%

发文量

681

审稿时长

6 weeks

期刊介绍： Toxics (ISSN 2305-6304) is an international, peer-reviewed, open access journal which provides an advanced forum for studies related to all aspects of toxic chemicals and materials. It publishes reviews, regular research papers, and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in detail. There is, therefore, no restriction on the maximum length of the papers, although authors should write their papers in a clear and concise way. The full experimental details must be provided so that the results can be reproduced. Electronic files or software regarding the full details of calculations and experimental procedure can be deposited as supplementary material, if it is not possible to publish them along with the text.