Research and Design Institute of Environmental Science of Guizhou Province

Guiyang, China

Research and Design Institute of Environmental Science of Guizhou Province

Guiyang, China
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Zhao T.,Guizhou University | Zhao T.,Research and Design Institute of Environmental Science of Guizhou Province | Yu Z.,Research and Design Institute of Environmental Science of Guizhou Province | Zhang J.,Research and Design Institute of Environmental Science of Guizhou Province | And 2 more authors.
Chinese Journal of Environmental Engineering | Year: 2017

Low-temperature pyrolysis technology was used to remedy high levels of mercury-contaminated soil (≥100 mg·kg-1). More than 70% of mercury was removed from the contaminated soil by the technology. However, 20% to 30% of mercury still remained in the soil. A field planting experiment was conducted to investigate the effects of residual mercury on crop growth, economic yield, and quality. Mercury transportation between plant tissues were also investigated. The results can be summarized as follows. First, the low-temperature pyrolysis technology does not reduce soil fertility. The organically bound fraction and the residual fraction were reduced by 64.07% and 56.38%, respectively. Second, the low-temperature pyrolysis technology had no damage on soil fertility. Third, high levels of mercury pollution inhibited the growth of crops. After the low-temperature pyrolysis treatment, there was a significant improvement in plant height and the economic yield increased from 2 to 3 times. In addition, the mercury content in potatoes, corn, and rice reduced by 51.2%, 43.8%, and 51.2%, respectively. Finally, the mercury distribution in the body of the three crops were in the following order: root >leaf >stem. The mercury content in root and leaf significantly decreased (2 to 5 times) after the treatment. © 2017, Science Press. All right reserved.

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