不同形态硫对城市生活垃圾热过程中重金属迁移特性的影响

摘要

In this paper, the effects of different forms of sulfide on the volatilization of heavy metals (Cd, Cr, Ni, Cu, Pb, and Zn) in municipal solid waste (MSW) were investigated. The heavy metal amount and surface morphology of bottom ash were analyzed with Atomic Absorption Spectrometer (AAS) and Scanning Electron Microscope (SEM) respectively. Results showed that, compared with the organic sulfur, inorganic sulfur can more effectively immobilize the heavy metals in bottom ash in the thermal process. The presence of sulfur compounds would inhibit the volatilization of Cd, Cu and Pb during the thermal process. The inorganic sulfur would inhibit the volatilization of Cr and Ni, while the organic sulfur would increase the volatilization rates. However, the presence of sulfur compounds would increase the volatilization of heavy metals in reducing atmosphere.%采用管式实验炉研究了不同形态硫化物对城市生活垃圾中Cd、Cu、Cr、Pb、Ni、Zn六种元素在热过程中的迁移特性的影响,使用原子吸收光谱仪和扫描电子显微镜等仪器对重金属浓度、灰渣表面形貌等进行了分析.结果表明,在热过程中,无机硫相对于有机硫能更有效地将重金属固定在底渣中.含硫化合物的存在可以减少Cd、Cu、Pb在热过程中的挥发;其中无机硫可以减少Cr、Ni的挥发,而有机硫则会增大Cr、Ni的挥发.但在还原性气氛中,含硫化合物的存在会增大重金属的挥发.