MAO Shijia 1 , YU Zhi 2,3,LIU Hongyan 1,3,ZHANG Junfang2,HUANG Wanyu 2 ,JIAN Huailiang1, LIU Caiyun1 , JU Xian hang 1,ZHAO Changchun1
(1. College of Agriculture, Guizhou University, Guiyang 550025, China;
2. Guizhou Academy of Environmental Science and Designing, Guiyang 550081, China;
3. College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China)
Abstract: Low-temperature pyrolysis technology is one of the effective engineering measures for remediation of mercury-contaminated soil, which can reduce soil environmental risks. In this paper, mercury-contaminated soil in mining area was selected for low-temperature pyrolysis remediation and vegetable planting. The changes of soil physical and chemical properties and mercury level before and after low-temperature pyrolysis were explored. The effects of low temperature pyrolysis remediation on the migration and accumulation of total mercury and methylmercury in soil to vegetables were studied. The results showed that after low-temperature pyrolysis, soil available phosphorus increased by 828. 0%, CEC, organic matter, total nitrogen and alkali-hydrolyzable nitrogen decreased in varying degrees. The total mercury removal rate was 86. 63%, and the methyl-mercury removal rate was 95. 34%. The total mercury and methyl mercury content in edible parts of Chinese-cabbage, radish, cabbage and pea decreased by 16. 67%, 36. 36%, 50. 00%, 50. 00% and 63. 16%, 37. 50%, 26. 67%, 22. 22% respectively after low-temperature pyrolysis. The results of this study can provide data reference for evaluating the remediation effect of low-temperature pyrolysis technology on mercury contaminated soil.
Key words: mercury-contaminated soil; low-temperature pyrolysis; methylmercury; vegetables
EARTH AND ENVIRONMENT： Vol. 51, No. 5, Tot No.355 2023
