Heavy metals and PCDD/Fs in solid waste incinerator fly ash in Zhejiang province,China: chemical and bio-analytical characterization |
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| Authors: | Jun Yao WenBing Li FangFang Xia YuanGe Zheng ChengRan Fang DongSheng Shen |
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| Institution: | (1) Department of Environmental Engineering, Taizhou College, Linhai, 317000, China;(2) Department of Environmental Engineering, Zhejiang University, Hangzhou, 310029, China;(3) College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310012, China;(4) School of Civil Engineering and Architecture, Zhejiang University of Science and Technology, Hangzhou, 310023, China; |
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| Abstract: | Fly ash samples were taken from solid waste incinerators with different feeding waste, furnace type, and air pollution control
device in six cities of Zhejiang province. The solid waste incinerators there constitute one fifth of incinerators in China.
Heavy metals and polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) were analyzed in the fly ash. Moreover, the fly ash samples were extracted by toxicity
characteristic leaching procedure (TCLP). The biotoxicity of the leachate was evaluated by Chlorella pyrenoidosa. High variation and contents were found for both the heavy metals and PCDD/Fs. The contents of Zn, Cu, As, Pb, Cd, Cr, Ni,
and Hg in the fly ash samples varied from 300 to 32,100, 62.1–1175, 1.1–57, 61.6–620, 0.4–223, 16.6–4380, 1.2–94.7, and 0.03–1.4 μg g−1 dw, respectively. The total contents of 17 PCDD/Fs varied from 0.1128 to 127.7939 μg g−1 dw, and the 2,3,7,8-TeCDD toxic equivalents (TEQ) of PCDD/Fs ranged from 0.009 to 6.177 μg g−1 dw. PCDF congeners were the main contributor to the TEQ. The leachate of the fly ash showed biotoxicity to C. pyrenoidosa. A significant correlation was found between the Cd and EC50 values. Further research is required to investigate the environmental impact of the various pollutants in the fly ash. |
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