title: Heavy metal enrichment characteristics in ash of municipal solid waste combustion in CO2/O2 atmosphere.
abstract: This paper investigated the behavior of six heavy metals (Cd, Pb, Cu, Cr, Ni and Zn) in the bottom ashes of recycled polyvinyl chloride pellets (PVC), wood sawdust (WS) and paper mixture (PM), representing the common components of municipal solid waste (MSW), obtained during combustion in CO2/O2 atmosphere in a lab-scale electrically heated tube furnace. Replacement of N2 by CO2 did not obviously change the shape of relative enrichment factor (RE) curves and subsequent order of heavy metals, but increased enrichment of these heavy metals in bottom ashes of WS, PM and PVC. The increment of O2 concentration in CO2/O2 atmosphere further increased RE values. It was only when the temperature was higher than or equal to 700°C that the increment of the combustion temperature reduced the RE values of heavy metals. The effect of temperature on heavy metals evaporation was the most pronounced for the medium volatile metal Pb, and the least for the low volatiles Cr and Ni. The effect of temperature was more pronounced for PVC ash than for WS and PM ashes. This paper contributes to the control of heavy metals during MSW incineration and management of MSW oxy-fuel residues.
authors.affiliation: Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization, South China University of Technology, Guangzhou 510640, China. Electronic address: tangyuting_43@163.com.
authors.forename: YuTing
authors.initials: Y
authors.lastname: Tang
authors.affiliation: Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization, South China University of Technology, Guangzhou 510640, China. Electronic address: epxqma@scut.edu.cn.
authors.forename: XiaoQian
authors.initials: X
authors.lastname: Ma
authors.affiliation: Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization, South China University of Technology, Guangzhou 510640, China.
authors.forename: QuanHeng
authors.initials: Q
authors.lastname: Yu
authors.affiliation: Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization, South China University of Technology, Guangzhou 510640, China.
authors.forename: Can
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Guangdong International Engineering Consultant Corporation, Guangzhou 510095, China.
authors.forename: Zhiyi
authors.initials: Z
authors.lastname: Lai
authors.affiliation: Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization, South China University of Technology, Guangzhou 510640, China.
authors.forename: Xiaoshen
authors.initials: X
authors.lastname: Zhang
mesh_terms: D002245:Carbon Dioxide; D060729:Coal Ash / Q000032:analysis / Q000737:chemistry*; D004867:Equipment Design; D017745:Incineration; D019216:Metals, Heavy / Q000032:analysis* / Q000737:chemistry; D010100:Oxygen; D011143:Polyvinyl Chloride; D011312:Pressure; D012037:Refuse Disposal / Q000295:instrumentation / Q000379:methods*; D062611:Solid Waste; D013696:Temperature
chemical_list: D060729:Coal Ash; D019216:Metals, Heavy; D062611:Solid Waste; D002245:Carbon Dioxide; D011143:Polyvinyl Chloride; D010100:Oxygen
keywords: Bottom ash; CO(2)/O(2) atmosphere; Enrichment; Heavy metal; MSW incineration