硅藻土对垃圾焚烧过程中重金属分布的影响  

Influence of Diatomite on Distribution of Heavy Metals in Waste Incineration

作　　者：唐彪 吴安 李彪 吴亭亭[1] TANG Biao;WU An;LI Biao;WU Tingting(Department of Chemical Engineering for Energy Resources,School of Resource and Environmental Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学资源与环境工程学院能源化工系,上海200237

出　　处：《华东理工大学学报（自然科学版）》2022年第3期316-323,共8页Journal of East China University of Science and Technology

摘　　要：选用管式炉作为燃烧反应器,研究了硅藻土对垃圾焚烧过程中重金属Pb、Cd、Cu和Zn分布特性的影响,并运用HSC Chemistry 6.0软件进行热力学模拟。实验结果表明:硅藻土使得重金属更多地分布于底灰中,对重金属的吸附作用随着其质量分数的增加逐步提升。600~800℃范围内硅藻土对重金属最佳吸附效率依次为Cd>Zn>Pb>Cu,900℃硅藻土对重金属的最佳吸附效率依次为Cd>Pb>Zn>Cu。模拟结果表明硅藻土能够与Pb、Cd、Zn反应生成相应的硅酸盐,对Cu的形态变化无影响。The tube furnace was selected as the combustion reactor,the actual domestic waste was used as the raw material.The heavy metal content was measured by inductively coupled plasma atomic emission spectrometer(ICPAES),and the surface morphology of diatomite before and after incineration was observed by the field emission electron microscope(FE-SEM).The influence of diatomite on the migration characteristics of heavy metals Pb,Cd,Cu and Zn in the waste incineration process at different temperatures(600、700、800、900℃)and addition mass fraction(1%,2%,3%,4%)was investigated in this paper.And HSC Chemistry 6.0 was used for thermodynamic simulation calculations.The experimental results showed that diatomite could make heavy metals more distributed in the bottom ash.With the increase in the amount of addition,the adsorption of heavy metals by the diatomite gradually increased.When the experimental incineration temperature was between 600-800℃,the adsorption efficiency of diatomite for heavy metals was as follows:Cd>Zn>Pb>Cu;at 900℃:Cd>Pb>Zn>Cu.The corresponding temperature of the best adsorption efficiency for Pb was 900℃,for Zn was 800℃,and for Cd and Cu were 700℃.Thermodynamic simulation found that diatomite could react with Pb,Cd,Zn to form corresponding silicates,and had no effect on the morphological changes of Cu.Combined with thermodynamic equilibrium simulation and experimental data analysis,physical adsorption and chemical adsorption coexisted in the adsorption of Pb,Cd and Zn by diatomite,and physical adsorption was the main adsorption for Cu.

关 键 词：垃圾焚烧 硅藻土 重金属 迁移分布 热力学模拟 

分 类 号：X705[环境科学与工程—环境工程]