Residual and ecological risk assessment of heavy metals in fly ash from co-combustion of excess sludge and coal.
Residual and ecological risk assessment of heavy metals in fly ash from co-combustion of excess sludge and coal.
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DOI：
10.1038/s41598-021-81812-5
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发表时间：
2021-01-28
影响因子：
4.6
通讯作者：
Zhang L
中科院分区：
文献类型：
--
作者：
Tang Y;Pan J;Li B;Zhao S;Zhang L
城市剩余污泥（ES）与煤的混合燃烧为处理ES提供了另一种方法。本研究旨在调查ES和煤混燃飞灰中重金属的残留和生态风险。本研究通过重金属总浓度和形态分布、SEM、EDX、XRD 表征和浸出试验对粉煤灰进行了评估。结果表明，飞灰中Cu、Zn、Mn的总浓度较高，且大部分重金属富集在细颗粒中。对于Cd、Cr和Pb，F4和F5的形态百分比均超过90%，表明浸出毒性相对较低。粉煤灰经两种稀释的HNO3溶液处理后，所有重金属的浸出率均低于5%。潜在的生态风险随着飞灰粒径的减小而增加，尽管与其他测量的重金属相比，Cd 的浓度较低，但它仍占生态风险的主要部分。
Co-combustion of municipal excess sludge (ES) and coal provides an alternative method for disposing ES. The present study aims to investigate the residual and ecological risk of heavy metals in fly ash from co-combustion of ES and coal. The total concentration and speciation distribution of heavy metals, characterization of SEM, EDX, XRD and leaching test were carried out to assess the fly ash in this study. The results showed that the total concentrations of Cu, Zn and Mn were higher than others in fly ash, and most heavy metals were concentrated in fine particles. For Cd, Cr and Pb, the percentages of speciation of F4 and F5 were all over 90%, suggesting the relatively lower leaching toxicity. The leaching percent of all heavy metals was lower than 5% by two diluted HNO3 solutions for fly ash. The potential ecological risks increased with the decrease of particle size of fly ash, and Cd accounted for the main fraction for ecological risk despite of lower concentration in comparison to other measured heavy metals.
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影响因子：
12.8
作者：
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