title: Characterization and environmental risk assessment of heavy metals found in fly ashes from waste filter bags obtained from a Chinese steel plant.
abstract: The environmental risk of exposure to six heavy metals (Cu, Pb, Zn, Cr, Ni, and Cd) found in fly ashes from waste filter bags obtained from a steel plant was estimated based on the mineralogical compositions, total concentrations and speciation of the metals in the fly ashes. The results indicated that the fly ashes mainly consisted of hematite, magnetite, cyanite, spinel, coesite and amorphous materials. The concentrations of Zn and Pb were much higher than that of other materials. After Zn and Pb, Ni was present in the highest concentration, followed by Cu, Cr and Cd. Each heavy metal was distributed differently in fly ashes. The levels of Zn, Cd and Pb in the active fraction were very high, and ranged from 64.83 to 81.96%, 34.48 to 82.4% and 6.92 to 79.65% respectively, while Cu, Cr and Ni were mainly present in the residual fraction. The risk assessment code (RAC) values of fly ashes showed that the Zn and Cd present in the H3 sample presented a very high risk, with RAC values greater than 50%. The Cu present in the H3 sample, Cd in the H2 sample and Zn in the H4 and H5 samples presented a high risk. The Pb present in the H2 sample, Cd in the H4 sample, Ni in the H1 and H5 samples, and Zn in the H1 sample presented a medium risk. A low risk was presented by the Cu present in the H1, H2, H4 and H5 samples, the Pb in the H1, H3 and H5 samples, the Cd in the H1 and H5 samples, and the Ni in the H2 sample. No risk was presented by Cr in any sample.
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Zhou
authors.forename: Xun-an
authors.initials: XA
authors.lastname: Ning
authors.forename: Xikai
authors.initials: X
authors.lastname: Liao
authors.forename: Meiqing
authors.initials: M
authors.lastname: Lin
authors.forename: Jingyong
authors.initials: J
authors.lastname: Liu
authors.forename: Jianghui
authors.initials: J
authors.lastname: Wang
mesh_terms: D000818:Animals; D060729:Coal Ash / Q000737:chemistry*; D004785:Environmental Pollutants / Q000032:analysis* / Q000633:toxicity; D005290:Ferric Compounds / Q000032:analysis / Q000633:toxicity; D052203:Ferrosoferric Oxide / Q000032:analysis / Q000633:toxicity; D006256:Hazardous Waste / Q000009:adverse effects / Q000032:analysis*; D007220:Industrial Waste / Q000009:adverse effects / Q000032:analysis*; D019216:Metals, Heavy / Q000032:analysis* / Q000633:toxicity; D018570:Risk Assessment; D013232:Steel
chemical_list: D060729:Coal Ash; D004785:Environmental Pollutants; D005290:Ferric Compounds; D006256:Hazardous Waste; D007220:Industrial Waste; D019216:Metals, Heavy; D013232:Steel; C000499:ferric oxide; D052203:Ferrosoferric Oxide
keywords: BCR; Environmental risk assessment; Heavy metal; Steel plant; Waste filter bag