Leaching behavior of Pb and Zn in air pollution control residues and their modeling prediction |
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Authors: | ZHANG Hu HE Pin-jing SHAO Li-ming FENG Jun-hui CAO Qun-ke |
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Affiliation: | State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai 200092, China |
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Abstract: | Increasing attention has been paid to air pollution control (APC) resi dues in China recently due to the rising proportion of waste incineration and th e hazardous characteristics of the residues, among which heavy metal leaching to xicity plays an important role. Leaching behavior and potential risk of Pb and Z n in the APC residues from a Shanghai municipal solid waste (MSW) incinerator wa s studied, based on the leaching tests under different conditions and theoretica l calculation using a geochemical thermodynamic equilibrium model MINTEQA2. Res ults showed that, extractant species and liquid to solid (L/S) ratio predomina ntly controlled the leaching toxicity of Pb and Zn, while ionic strength, vibr ation method and leaching time had less effect on the metals release. Leachate/f inal pH determined the metal leaching behavior, which changed the speciation of heavy metals in the extraction system. The equilibrium aqueous speciation, preci pitation-dissolution of Pb and Zn was investigated according to the model comput ation, which was well in agreement with the experimental results. |
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Keywords: | leaching behavior air pollution control residues MINTEQA2 incineration plant heavy metals |
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