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| Effects of simulated acid rain on heavy metal release and biological toxicity of lead and zinc smelting waste residues |
| Received:April 19, 2020 |
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| KeyWord:simulated acid rain;lead-zinc smelting waste residues;heavy metals;luminescent bacteria;biological toxicity |
| Author Name | Affiliation | E-mail | | LI Xiao-han | College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China | | | WU Yong-gui | College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China
Institute of Applied Ecology, Guizhou University, Guiyang 550025, China
Karst Environmental Ecosystem Department of Education Field Scientific Observation and Research Station of Guizhou Province, Guiyang 550025, China | ygwu72@126.com | | LIU Ming-feng | College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China | | | LAN Mei-yan | College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China | |
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| Abstract: |
| To evaluate the effect of acid rain leaching on the release of heavy metals and biotoxicity in lead-zinc smelting waste residue, a large amount of lead-zinc smelting waste yards piled in the severe area of acid rain in northwestern Guizhou was selected as the research object, and deionized water was used as an extractant in the control group to analyze the distribution characteristics of heavy metals under different acidity values in simulated acid rain leaching. Different sizes of waste residues and the law of biological toxicity were analyzed. The results show that, compared to the control, the simulated acid rain could reduce the pH value of the lead-zinc waste residue leaching solution to varying degrees; the smaller the particle size of the waste residue, the higher the electrical conductivity of the leachate. Simulated acid rain could increase the concentrations of Cu, Zn, and Cd in the extraction solution of lead and zinc smelting waste residues. Under the same conditions, the concentration of heavy metals in the extraction solution generally increased with the decrease in the particle size of the waste residues. The simulated acid rain could promote the transformation of residual Cu, Pb, and Zn in waste residues to other forms and increase the environmental risk of lead and zinc waste residue accumulation. Further analysis shows that the higher the content of Zn and Cd in the waste residue leaching solution, the greater the biological toxicity of the leaching solution, while the higher the Cu content in the waste residue leaching solution in the low concentration range, the less the biological toxicity. In summary, the simulated acid rain could promote the dissolution and release of heavy metal ions in lead and zinc smelting waste residues, changing the forms of heavy metals in waste residue and increasing the biological toxicity of waste residue leachate, thereby increasing the environmental and ecological risks of lead-zinc smelting waste residue yards. |
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