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Leaching behavior of Pb and Zn in air pollution control residues and their modeling prediction
Authors:ZHANG Hu  HE Pin-jing  SHAO Li-ming  FENG Jun-hui and CAO Qun-ke
Institution:State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai 200092, China
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.
Keywords:leaching behavior  air pollution control residues  MINTEQA2  incineration plant  heavy metals
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