title: Effects of chlorine on the volatilization of heavy metals during the co-combustion of sewage sludge.
abstract: To clarify the volatilization of heavy metals (Cu, Ni, Pb, and Zn) in sewage sludge during co-combustion in cement kiln, effects of addition and types of four chlorides and temperature on the volatilization of heavy metals in raw meal with 25wt.% sewage sludge were investigated. The results showed that the volatilization of Cu, Ni, and Pb increased significantly with increase of chlorides addition, while no obvious change in the volatilization of Zn was observed. The effectiveness of chlorides on the volatilization of heavy metals depended on their release capacity of chlorine radicals and the chlorine combined capacity of heavy metals. Higher calcination temperature resulted in dramatically increase in the volatilization of heavy metals due to easier formation of volatile heavy metal chlorides. The results will provide a guideline for co-combusting heavy metals contained solid wastes in cement kiln on the basis of security.
authors.affiliation: School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China.
authors.forename: Shengrong
authors.initials: S
authors.lastname: Yu
authors.affiliation: School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Zhang
authors.affiliation: School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China; Guangdong Low Carbon Technologies Engineering Center for Building Materials, Guangzhou 510640, Guangdong, China. Electronic address: jxwei@scut.edu.cn.
authors.forename: Jiangxiong
authors.initials: J
authors.lastname: Wei
authors.affiliation: School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China.
authors.forename: Tongsheng
authors.initials: T
authors.lastname: Zhang
authors.affiliation: School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China; Guangdong Low Carbon Technologies Engineering Center for Building Materials, Guangzhou 510640, Guangdong, China.
authors.forename: Qijun
authors.initials: Q
authors.lastname: Yu
authors.affiliation: China Building Materials Academic, Beijing 100024, China.
authors.forename: Wensheng
authors.initials: W
authors.lastname: Zhang
mesh_terms: D002713:Chlorine / Q000032:analysis / Q000737:chemistry*; D017745:Incineration; D019216:Metals, Heavy / Q000032:analysis / Q000737:chemistry*; D062611:Solid Waste; D014835:Volatilization; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D019216:Metals, Heavy; D062611:Solid Waste; D002713:Chlorine
keywords: Chlorine; Heavy metal; Incineration; Sewage sludge; Temperature; Volatilization