Effect of co-combusted sludge in waste incinerator on heavy metals chemical speciation and environmental risk of horizontal flue ash
Effect of co-combusted sludge in waste incinerator on heavy metals chemical speciation and environmental risk of horizontal flue ash
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DOI：
10.1016/j.wasman.2019.11.027
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发表时间：
2020-02-01
期刊：
影响因子：
8.1
通讯作者：
Niu, Yadong
中科院分区：
文献类型：
--
作者：
Chen, Limei;Liao, Yanfen;Niu, Yadong
在垃圾焚烧炉中焚烧污泥是污泥处置的一种趋势，而水平烟灰中的重金属问题是一个令人担忧的问题。在污泥混烧前后，收集垃圾焚烧炉内的水平烟道灰。采用X射线荧光光谱、扫描电子显微镜、电感耦合等离子体发射光谱仪研究了污泥对重金属在不同受热表面上分布的影响。所有水平烟灰的潜在生态风险指数均大于600，生态风险较高。添加污泥混烧后，所有灰样中的重金属含量均有所增加。在重金属的化学形态方面，污泥的加入增加了重金属的温和酸溶态、可还原态和可氧化态的含量，而降低了残渣态的含量。污泥混烧增加了环境污染和重金属的潜在生态风险。给出了各形态重金属含量与烟气温度、污泥混合量之间的拟合关系，可用于水平烟气中重金属含量的预测。(C)2019爱思唯尔有限公司。保留所有权利。
Incineration of sludge in waste incinerators is a trend of sludge disposal, and the problem of heavy metal in horizontal flue ash is a concern. Horizontal flue ash in waste incinerator was collected before and after the sludge was co-combusted. XRF, SEM-DES, and ICP were used to characterize the effect of sludge on the distribution of heavy metals on different heated surfaces. Potential ecological risk index of all horizontal flue ash was higher than 600, indicating the high ecological risk. After adding sludge for co-combustion, heavy metals content in all ash sample increased. As for chemical speciation of heavy metals, the addition of sludge increased the content of mild acid-soluble fraction, reducible fraction and oxidizable fraction of heavy metals, while decreased that of the residual fraction. Environmental pollution and potential ecological risks of heavy metals were increased when sludge was co-combusted. The fitting relation between the heavy metals content of each speciation and the gas temperature and the sludge mixing amount was given, which could be used to predict the heavy metal content in horizontal flue ash. (C) 2019 Elsevier Ltd. All rights reserved.