An experimental and thermodynamic equilibrium investigation of the Pb, Zn, Cr, Cu, Mn and Ni partitioning during sewage sludge incineration
An experimental and thermodynamic equilibrium investigation of the Pb, Zn, Cr, Cu, Mn and Ni partitioning during sewage sludge incineration
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污泥焚烧过程中 Pb、Zn、Cr、Cu、Mn 和 Ni 分配的实验和热力学平衡研究
DOI：
10.1016/j.jes.2015.01.027
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发表时间：
2015-09-01
影响因子：
6.9
通讯作者：
Zhong, Sheng
中科院分区：
文献类型：
--
作者：
Liu, Jingyong;Fu, Jiewen;Zhong, Sheng
采用模拟实验室管式炉反应器，研究了不同氯化物和运行条件对污泥焚烧过程中Pb、Zn、Cr、Cu、Mn和Ni等6种重金属分布形态的影响。使用FactSage软件进行热力学平衡调查，以比较实验结果。结果表明，随着氯气浓度的增加，目标金属的挥发性增强。无机Cl对重金属挥发的影响大小为Pb > Zn > Cr > Cu > Mn > Ni。有机氯对Mn、Pb、Cu挥发性的影响大于对Zn、Cr、Ni的影响。随着燃烧温度的升高，有机氯（PVC）和无机氯（NaCl）的存在促进了Pb和Zn从底灰向飞灰或烟气的迁移。而氯化物的存在对锰、铜和镍的影响不明显。延长停留时间可以提高重金属的挥发速率，但这种影响并不显著。在焚烧过程中，铅很容易形成PbSiO4，并留在底灰。不同的铅化合物，主要是挥发性的PbCl2，被发现在气相中添加NaCl后，在气相中的主要铅化合物添加后的PVC是PbCl2，Pb（ClO4）（2）和PbCl2O4。(C)2015中国科学院生态环境科学研究中心由爱思唯尔公司出版
The effects of different chlorides and operational conditions on the distribution and speciation of six heavy metals (Pb, Zn, Cr, Cu, Mn and Ni) during sludge incineration were investigated using a simulated laboratory tubular-furnace reactor. A thermodynamic equilibrium investigation using the FactSage software was performed to compare the experimental results. The results indicate that the volatility of the target metals was enhanced as the chlorine concentration increased. Inorganic-Cl influenced the volatilization of heavy metals in the order of Pb > Zn > Cr > Cu > Mn > Ni. However, the effects of organic-Cl on the volatility of Mn, Pb and Cu were greater than the effects on Zn, Cr and Ni. With increasing combustion temperature, the presence of organic-Cl (PVC) and inorganic-Cl (NaCl) improved the transfer of Pb and Zn from bottom ash to fly ash or fuse gas. However, the presence of chloride had no obvious influence on Mn, Cu and Ni. Increased retention time could increase the volatilization rate of heavy metals; however, this effect was insignificant. During the incineration process, Pb readily formed PbSiO4 and remained in the bottom ash. Different Pb compounds, primarily the volatile PbCl2, were found in the gas phase after the addition of NaCl; the dominant Pb compounds in the gas phase after the addition of PVC were PbCl2, Pb(ClO4)(2) and PbCl2O4. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.