title: Comparative study on the mobility and speciation of heavy metals in ashes from co-combustion of sewage sludge/dredged sludge and rice husk.
abstract: The co-combustion of sludge (sewage and dredged sludge) with rice husk is expected to become a trend because of its economic and environmental benefits. However, the massive residues from the co-combustion process and the mobility of heavy metals (HMs) warrant special attention. The basic performance and environmental properties of the trace elements (Cr, Cu, Fe, Mn, Ba and Zn) from the co-combustion ashes were studied to promote the further utilization of these materials. These ashes have a shell particle shape, high specific area, high amorphous content and low crystalline phase content. The investigation mainly focused on the environmental properties of these ashes to evaluate the risk of these by-products to the environment. Results show Cu, Mn, and Zn have cumulative leaching concentrations of 1.033, 23.32, and 3.363 mg/L for W, by contrast, Cr, Cu, Fe, Mn, Ba, and Zn have cumulative leaching concentrations of 0.488, 0.296, 8.069, 10.44, 2.568, and 2.691 mg/L for H, which are much greater than the Chinese ground water standard (GB/T14848-93). Meanwhile Mn, Zn, Ba, Cr, and Fe all pose a very high risk for H, while Cu only poses a medium risk, and all HMs in W exhibit much lower contamination levels than those in H by the method of risk assessment code (RAC). It indicates that these ashes have undesirably high levels of HMs that demonstrate high mobility and pose environmental risks according to their leachability and chemical speciation. And the HMs in W show lower mobility and environmental hazards than those in H.
authors.affiliation: School of Resource and Environment Science, Wuhan University, Wuhan 430072, China.
authors.forename: Teng
authors.initials: T
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430072, China.
authors.forename: Yongjie
authors.initials: Y
authors.lastname: Xue
authors.affiliation: School of Resource and Environment Science, Wuhan University, Wuhan 430072, China.
authors.forename: Min
authors.initials: M
authors.lastname: Zhou
authors.affiliation: School of Resource and Environment Science, Wuhan University, Wuhan 430072, China.
authors.forename: Yunjuan
authors.initials: Y
authors.lastname: Yuan
authors.affiliation: School of Resource and Environment Science, Wuhan University, Wuhan 430072, China.
authors.forename: Suyun
authors.initials: S
authors.lastname: Zhao
authors.affiliation: State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430072, China.
authors.forename: Gang
authors.initials: G
authors.lastname: Tan
authors.affiliation: School of Resource and Environment Science, Wuhan University, Wuhan 430072, China.
authors.forename: Xian
authors.initials: X
authors.lastname: Zhou
authors.affiliation: School of Resource and Environment Science, Wuhan University, Wuhan 430072, China.
authors.forename: Junjun
authors.initials: J
authors.lastname: Geng
authors.affiliation: State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430072, China.
authors.forename: Shaopeng
authors.initials: S
authors.lastname: Wu
authors.affiliation: School of Resource and Environment Science, Wuhan University, Wuhan 430072, China. Electronic address: houhb@whu.edu.cn.
authors.forename: Haobo
authors.initials: H
authors.lastname: Hou
mesh_terms: D004784:Environmental Monitoring; D004785:Environmental Pollutants / Q000032:analysis*; D017745:Incineration; D019216:Metals, Heavy / Q000032:analysis* / Q000737:chemistry; D012275:Oryza / Q000737:chemistry*; D018570:Risk Assessment; D012722:Sewage / Q000737:chemistry*
chemical_list: D004785:Environmental Pollutants; D019216:Metals, Heavy; D012722:Sewage
keywords: Chemical speciation; Co-combustion; Heavy metals; Mobility; Rice husk; Sludge